Fitech Backfire On Deceleration

First let's cover the "basics" in terms of the possible causes of engine surging/hunting, where engine speed suddenly (or slowly) changes. Just like any other digital control system, they can be 'open loop' or 'closed loop'. The Self Tuning Fuel Injection systems are perfect for your everyday Driver right up to your weekend Street Machine or Bracket Racer. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. When decelerating in gear, the MAP is very low, which means the fuel pulsewidths are very small. Idle seemed much smoother as well. My engine is backfiring through the exhaust on deceleration. The Cutoff RPM is the RPM at which fuel is disabled, spark is cut or the ETC begins limiting and the Resume RPM is the RPM at fuel is re-enabled. I have a situation I can't seem to figure out. These are things you can do or check to help solve this problem outside of just desmogging the motor. It was an easy choice for me. This feature is set at 2048 RPM by default however the setting is adjustable from 1280 to 3040 RPM. Page 2- new exhaust backfiring FiTech Go EFI , Explorer Serp,2. If the muffler shop missed even a tiny little spot on the welds it will suck air and pop on deceleration. 5" exhaust does the same thing actually. Backfires occur in one of two places. What more can I say, Tech installed on 69 Chev truck, SBC Stroker broke in with Double pumper Used the Command Center and put this set on. The engine also has a very high amount of internal EGR, which causes combustion to be very difficult. I have checked exhaust gasket and vacuum lines and all looks good. bought a replacement swapped it over and sure enough no more popping and. Why does my engine spit or backfire? First off, you need to determine whether it is backfiring out the exhaust or back up through the carb. It starts right up and goes into a smooth idle, there's no hesitation on acceleration, no popping on deceleration, and the choke now works like it should. Toggle navigation. Something you should understand before going any further is that a motor in perfect tune will exhibit deceleration backfiring. The lean rpm surge is common in other two strokes, such as chain saws, and I don't think they even have float bowls. Be sure to get good quality cap and rotor when replacing. The second smaller wire is what tells the fitech to shut down when you turn the key off. Read all about it and the great details in this issue of High Performance. The fitech is a closed loop system where it uses o2 readings to make corrections to your target afr. When the gasket starts to go bad I get a popping through the exhaust under deceleration. Engine backfire is caused by an imbalance in the air-to-fuel ratio of the vehicle. Understand basic information about AFR values and the difference between narrowband and wideband. Burble feature now available on our tunes upon demand. He is an HPTuners member on this site. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. Fitech timing control does not work with ready to run distributors. All Fitech EFI systems have learning procedures that the system uses to adjust the active fuel tables it is using for operation. It's not loud but weird to me. try 14-18 degrees of intail timing and the rest should kick in. Even stock it shouldn't backfire - mild poping at most (my dad got an XR-L nearly new and I rode it a bit when it was bone stock, took my street licsen test on it as a matter of fact). 0 with FAST Dual Sync Distributor, E6 Digital CD Ignition Kit. I rerouted the tach wire and a few spark plug wires and now my pickup runs like a champ. I am now looking to buy a wrecked GM truck that has a 5 or 6 speed manual trans in it so I can pilfer all the parts I need for my truck and never worry about that stinking automatic tans again!. 5 in the green I get popping all over the place, depending on the weather. Disconnect valve signal line. again I can coast down the freeway at 60mph, with it out of gear, engine idling away happily, and put the breaks on and make it stall (or act like its going to) no braking, no stalling. 0 Backfiring/Misfiring under load and part throttle the truck started to miss about every 10 miles of driving and about every 20 it would backfire/pop. I had a 4-hole spacer first which was said to be the worst that can be done with the EFI so i added an open on and that is supposed to even out any fuel distribution issues on the. This excess air passing through your piston rings from your combustion chamber to your crankcase is full of hydro carbons and bad for the environment and your crankcase, if not taken care of it will cause a pressure rise in your crankcase, blow seals, cause leaks. Open/Closed Loop Operation Open Loop When the engine is first started the system goes into open loop operation. com is a massive internet community hosting over 100,000 members and growing each day. Now that a decent number of members have purchased a FiTech unit I thought it would be nice to have a common thread where we could discuss specific tuning / adjustments that we have made along the way. Upgrading to Gen III LS-Series PCM: Sensors and Inputs Guide includes instructional photos, checklists, and step-by-step instructions on upgrading to the GM Gen III LS-Series PCM, ECM, Electronics, and POWERTRAIN CONTROL SYSTEMS. Then discover how to target desired AFR values with the modes featured on the AFR+. High Altitude Compensation System If this is your first visit, be sure to check out the FAQ by clicking the link above. ,running pro kurakyn hypercharger and cobra pro hp 2 into 1 exhaust ,was previosly running with v+h slippons,still the same issue,bike shop having issue resolving this. I've also noticed that while puttering around corners and slowly accelerating, when I reach about 2800 RPM, it seems like the engine is fluttering, like there isn't enough gas getting to the engine. So at full boost it showed 19 degrees but under load on a dyno it was actually found to be 27 degrees and that blew 2 head gaskets out. Installed my second FiTech system on a friends car a 2 weekends ago. mine is doing the same thing! My wife took it to auto zone and they told her it was the mafs. It is the perfect complement to the CORSA Sport exhaust system. Learn about this problem, why it occurs, and how to fix it. Incorrect timing. One thing a lot of motorcycle owners don't realize is that there was probably decel popping with the OEM exhaust, but due to the restrictive baffling of stock exhaust systems you never heard it. To all those who use the Fitech 600 system, I need your help. Multipurpose Car Scratch Remover Cloth, Nano Car Paint Scratch Remover,Car Scratch Repair Kit for Repairing Car Scratches and Light Paint Scratches Remover Scuffs on Surface,Come. 5 in the green I get popping all over the place, depending on the weather. the fitech is slowly getting better i've begun experimenting lightly with it i added a bit more fuel to decel for the hell of it when i'm out hauling *ss and the pipes get hot and i let off it dumps more fuel and starts popping and crackling, it sounds pretty cool, i need to do a few drive bys and let off on video cause i honestly think a few times i heard a pop that sounded like there should. Seems to do it as the A/F Ratio is getting richer. The AFR at that time is about 15:1 16:1, and corrects itself quickly to 13:1 Also have noticed a exhaust pop and a leaner AFR on closed throttle decell, at around 17 to 18. Any time the exhaust is “opened up” the condition of deceleration pops is MUCH more noticeable and problematic. with the decel unless your engine braking and don't like the popping through the. I has ran great but just recently in started to backfire when I am going down a hill or slowing down. Slowing down or whatever doesn't pop whatsoever. Is there a difference in when for troubleshooting purposes? e. A backfire in the intake manifold is caused by a ratio that is too lean (not enough fuel). I wanted to buy a complete kit so I went with the external pump. If anyone is installing a Fitech and it pops out the exhaust on deceleration, backfires out the throttle body, and is hard to get started good chance you have the old software. These are things you can do or check to help solve this problem outside of just desmogging the motor. I have a fitech dual quad on my 511 stroker with a tunnel ram. We brought in Mark Thomas and his 1955 Chevrolet Nomad to convert him over to EFI. Holley® has been the undisputed leader in fuel systems for over 100 years. I rerouted the tach wire and a few spark plug wires and now my pickup runs like a champ. They boast the FASTEST most accurate Self Learning available, Timing control, Wet flow Annular discharge and tons of additional features. On this test, the deceleration of the drum was severe enough that the bot rotated forward against the linkage… causing the drum to strike the ground and hilarity to ensue. Raising the idle timing helps reduce "popping" in low throttle overrun significantly, but you can only raise the idle timing while carefully watching for highest steady vacuum. It now cuts the fuel out earlier. It will sometimes try to die if I don't throw it in neutral and keep the revs up after a hard acceleration followed by a hard brake. I take ABSOLUTELY ZERO CREDIT for the length of material you're about to read, however I have made a few comments in-text that you can see which I will highlight in green. Now, after cleaning the bits of aluminum dust from everything, I could assemble it. The differences between the MSD controller and the Fitech as far as I can tell: 1. In addition, the software allows you to enrich the mixture based on coolant temperature and/or air temperature as well as during acceleration and deceleration. SOURCE: 2004 Suzuki VL1500 Intruder LC Motorcycle backfire If they cant duplicate it your good. After getting up to full operating temp for over 30-45 minutes, I notice a small but fairly consistent exhaust backfire in between the 1-2 shift as I let off the gas. You may have to register before you can post: click the register link above to proceed. The Deceleration Pop Problem Decel Pop is many times a nasty issue to deal with. Tuning a carburetor to supply an engine with the correct jetting - air/fuel mixture has always been a job that almost impossible for most hot rod owners and tuners. • backfiring on deceleration I have the FiTech and is going through a similar issue as yours. MSD has more features. Yep, too far advanced. I am hearing a kind of rumbling from the drive train. Even stock it shouldn't backfire - mild poping at most (my dad got an XR-L nearly new and I rode it a bit when it was bone stock, took my street licsen test on it as a matter of fact). you do have the correct 4 BARREL intake (not 4v)for your 2V heads. Contact [email protected] Now that a decent number of members have purchased a FiTech unit I thought it would be nice to have a common thread where we could discuss specific tuning / adjustments that we have made along the way. Defective air pump diverter valve. With the CD design, the voltage sent to the coil positive terminal is always at full power even at high rpm. At first I thought it was comin from the top but when i get under it it's alot louder sounds like its comin from the oil pan. Any more ideas? I did change my o-rings with the injectors, but again I don't have the symptoms that Yellow4g63 mentioned anyways. If you want to get rid of the noise, you will need to de. I have a situation I can't seem to figure out. I replaced the start jet with the 62. Deceleration Mode: When the driver releases the accelerator pedal, air flow into the engine is reduced. Installed my second FiTech system on a friends car a 2 weekends ago. Haven't tried it, as this is difficult to say the least. It will drop RPM's way too low. FiTech offers an array of FiTech EFI Systems, designed around your HP needs. Tuning a carburetor to supply an engine with the correct jetting - air/fuel mixture has always been a job that almost impossible for most hot rod owners and tuners. SOURCE: 2004 Suzuki VL1500 Intruder LC Motorcycle backfire If they cant duplicate it your good. seems to have worked well. A few weeks ago the car was idling and it sounded like it was trying to backfire or "burp". Currently it seems to be randomly blowing white smoke out the tailpipe mainly on acceleration esp from a stop. Six-speed WS6 Pontiac is the product of a '90s GM strike, a paint recall and pure dumb luck. Something you should understand before going any further is that a motor in perfect tune will exhibit deceleration backfiring. View attachment 580103. Regarding the confusion on Mr 42 s crankcase ventilation post Crankcase ventilation is needed to take care of piston ring blow-by. Symptoms of a Bad or Failing. The decel backfire is gone, so I must have had something wrong with the locked distributor setup. High Altitude Compensation System If this is your first visit, be sure to check out the FAQ by clicking the link above. Page 2- new exhaust backfiring FiTech Go EFI , Explorer Serp,2. I have had several issues that FiTech had me re-flash to fix. Any more ideas? I did change my o-rings with the injectors, but again I don't have the symptoms that Yellow4g63 mentioned anyways. again I can coast down the freeway at 60mph, with it out of gear, engine idling away happily, and put the breaks on and make it stall (or act like its going to) no braking, no stalling. I have checked exhaust gasket and vacuum lines and all looks good. I had to get a special exhaust system from Japan from Mazda that could take the huge backfire. Bottomline, the only way to muffle this popping is to go back to the original exhaust? This MSA PREMIUM EXHAUST SYSTEM comes with a Turbo Muffler while the other one was a simple Dynamax muffler. It is designed to remedy and prevent problems associated with the harmful carbon deposits (especially from the EGR gases that are recirculated in to the intake manifold). I have had several issues that FiTech had me re-flash to fix. Looking forward to running it in the car soon. The decel backfire is gone, so I must have had something wrong with the locked distributor setup. I now get a gunshot like backfire on deceleration (slow or sudden deceleration). 97-04 C5/ZO6 Borla Crossover X PipeBorla s crossover x pipe for the C5 and Z06 Corvette offers improved, balanced side-to-side exhaust flow for increased power and reduction of exhaust idle burble and popping on decelera. I have this problem myself. It summarizes links to solutions for popular FiTech issues posted in the "World Famous Pinned Post"- https: Deceleration Backfire Issue - https:. 2) The "pop" is not as loud as those real backfiring at exhaust. Sure, there are el-cheapo garbage harnesses that many systems provideand they will work for a little whileuntil you get some miles on it and dirt works its way into the connections and all sorts of electrical gremlins start popping upthat people always erroneously blame the ECU manufacturer for. They boast the FASTEST most accurate Self Learning available, Timing control, Wet flow Annular discharge and tons of additional features. Hello, so there's no easy answer for this - but I'll do my best to explain. There is an algorith that lets you compensate for wall wetting and such. com 7 years (2007-2013) in a row, by a large margin, for the best message board of the year awards. Seems I am having an issue with my fans. No noise on deceleration, or with "hard" braking while at steady speed. Open loop also uses maf meter readings which is slower. Ultimate LS Induction System Standalone ECU Without Transmission Control Intake Manifold and Injectors NOT Included If you re considering utilizing a factory intake, injectors, and cable operated throttle body, FiTech s Ultimate LS standalone self-learning ECUs will get your engine ready for optimal performance. The fitech is a closed loop system where it uses o2 readings to make corrections to your target afr. These are things you can do or check to help solve this problem outside of just desmogging the motor. You may have to register before you can post: click the register link above to proceed. Just like any other digital control system, they can be 'open loop' or 'closed loop'. • backfiring on deceleration I have the FiTech and is going through a similar issue as yours. My engine is backfiring through the exhaust on deceleration. got any idea what could be wrong before I disassemble and rebuild all 4 -I did disassemble and clean them before I tried to sync them ( this bike sat of 20 years in a barn. With engine running a vacuum must be felt. Also have a MSD 6AL-2 programmable. 040 with TRW flat top. The vacuum created by the engine's normal pumping process produces the necessary suction to pull air from the crankcase. First let's cover the "basics" in terms of the possible causes of engine surging/hunting, where engine speed suddenly (or slowly) changes. Personally, if it wasn't a vert, I'd go for the GT500, hands downalthough I don't care for the ad much. I wanted to buy a complete kit so I went with the external pump. A faulty ignition system is a possible cause of a engine backfire. Learn about this problem, why it occurs, and how to fix it. This is basic overview of the most common setup questions. IDLE TUNING Foreword by Rinkrat456: This article is literally copied and pasted from Krambo's Silverado SS page. Thanks again for the pointers guys. The Stock OEM module uses what is known as a Deceleration Cut feature which, during deceleration (declining rpms with closed throttle), from some higher rpm (above 2300) down to 1796 rpm, "Turns the fuel off". It is nice being able to buy carb parts at your local parts store though. Fitech Efi systems are self learning and with a few basic settings will run and learn as you drive out of the box. Had to add fuel to the accel at 65 and 170 degrees to keep it from bucking if you stabbed the throttle quickly. 040 with TRW flat top pistons -. I gave a last-chance inspection for O-ring seating and wire clearance, and ran the locking nuts down in. Doesn’t matter if it’s a carb or fuel injected. Fitech is running! Had some trouble on start up. The PCM monitors the corresponding changes in the TPS, MAP and MAF sensors. Nah, I got rid of the Fagnaflow long time ago on my Suburban and replaced it with a Spintech, which I don't like either. Backfiring is typically a too-rich condition. I have a loud knocking noise coming from the engine. 040 with TRW flat top. In the FITECH, the DFCO is easily tuned from the handheld. View attachment 580103. I think @Hash_Brown is on the right track. The engine also has a very high amount of internal EGR, which causes combustion to be very difficult. It it my understanding that the short header=burnt exhaust valves theory is pointing toward that fact the exhaust system has a vacuum of sorts when you let off the throttle, hence the reason that engines with cracked or broken headers backfire under decel. The car continually dies on deceleration. com for more info on our BMW F Series custom tunes. Be sure to get good quality cap and rotor when replacing. The second smaller wire is what tells the fitech to shut down when you turn the key off. One thing a lot of motorcycle owners don't realize is that there was probably decel popping with the OEM exhaust, but due to the restrictive baffling of stock exhaust systems you never heard it. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. I've had the turbo since 2006, but I couldn't tune out a bad lean backfire problem with the blowthrough carb. I rerouted the tach wire and a few spark plug wires and now my pickup runs like a champ. Incorrect timing. The dealer is inexperienced at solving compound problems,(sorry) not picking a fight, but sometimes cleaning is not goog enough,I went through this with a 1400 Intruder. The vacuum created by the engine's normal pumping process produces the necessary suction to pull air from the crankcase. I'm excited!!!!! I'm sure I will be back looking for some fine tuning advice, but so far so good. Simply take note of the RPM where the popping stops and set the "Decel Fuel Cut Rpm Low". Either one is nice, but if you want a GT350 to wind it out, there's really no comparison. there is nothing about deceleration that causes an engine with a big or small cam to stall. I think one of my Fitech call's I was given the same info of setting it to -30. Now, after cleaning the bits of aluminum dust from everything, I could assemble it. Symptoms of a Bad or Failing. On my 302 car, I seem to be having some issues from underhood heat. Air/fuel mixture is primarily determined by jet and throttle-bore size. The backfire tends to happen while slowly accelerating when the A/F Ratio is 12. With engine running a vacuum must be felt. again I can coast down the freeway at 60mph, with it out of gear, engine idling away happily, and put the breaks on and make it stall (or act like its going to) no braking, no stalling. In the low rpm timing was fine but as soon as it hit over 4000 rpm the timing was out 8 degrees. Learn about this problem, why it occurs, and how to fix it. Check for loose wires, arcing plug wires, cap and rotor, CDI box interference, etc. On this test, the deceleration of the drum was severe enough that the bot rotated forward against the linkage… causing the drum to strike the ground and hilarity to ensue. Contact [email protected] There is an algorith that lets you compensate for wall wetting and such. They boast the FASTEST most accurate Self Learning available, Timing control, Wet flow Annular discharge and tons of additional features. there is nothing about deceleration that causes an engine with a big or small cam to stall. Why does my engine spit or backfire? First off, you need to determine whether it is backfiring out the exhaust or back up through the carb. It it my understanding that the short header=burnt exhaust valves theory is pointing toward that fact the exhaust system has a vacuum of sorts when you let off the throttle, hence the reason that engines with cracked or broken headers backfire under decel. 71 Sport, 302 w/RV cam, 4bbl. Reset Idle Learn = The Idle Air Learning can be reset to a default value (16 steps) - by setting this control value to 1, and turning the key off and waiting for the system to completely power down. First, it might be an exhaust leak. If you want to get rid of the noise, you will need to de. Dialing in the MegaSquirt Startup Sequence So, you've just installed a MegaSquirt, and are having trouble getting the engine started? With MegaSquirt, or any standalone engine management system for that matter, the startup sequence is something that needs to be tuned for your engine. anyway can i change this gasket myself? and is this the same. I was told to change it in increments of "10" when I make the changes. I'm excited!!!!! I'm sure I will be back looking for some fine tuning advice, but so far so good. Everybody says the Tanks with the Walbro pump installed is the way to go but it meant ordering that separately and more expense so this the way I went and now I'm stuck with it( at least until the pump gives up). Engine's are inefficient when cold and will require a lot more fuel, so that may be what's masking the symptoms until warm. But the bigger question is how does gas get there in the first place, and that’s a bit more complicated. 0 Backfiring/Misfiring under load and part throttle the truck started to miss about every 10 miles of driving and about every 20 it would backfire/pop. Backfires occur in one of two places. several attempts were needed to get the two carbs level on. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. mention that with the cats removed and on deceleration followed by a hard acceleration all the unburnt fuel in the exhaust explodes. After consulting with Fitech, I went back to using Distributor and vacuum advance, and using the system for fuel delivery only. was told that it needs to be smoke tested but he thinks its the intake gasket or "insulating bolts"i think thats what he called them. Seems I am having an issue with my fans. Is there a difference in when for troubleshooting purposes? e. You can take a small flathead screwdriver bit and fit it in there. au Use this chart to find the right Fitech product for your car. On the Pontiac forum they seem to lessen the ex popping by adjusting the Decel open IAC to some where between -10 and -30. again I can coast down the freeway at 60mph, with it out of gear, engine idling away happily, and put the breaks on and make it stall (or act like its going to) no braking, no stalling. Built from 2 1/2" mandrel-bent 16-gauge stainless steel. Yep, too far advanced. Something you should understand before going any further is that a motor in perfect tune will exhibit deceleration backfiring. Unfortunately it also does it between shifts. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Yes the FiTech has the IAC Decay setting which can quicken or slow down the IAC when you let completely off the throttle at a high RPM like I do. Fitech Efi systems are self learning and with a few basic settings will run and learn as you drive out of the box. Let off the brakes and the engine comes back idle. so I cleaned it and same thing,replaced it and no change took it to a machanic and pulled up 2 lean codes. I has ran great but just recently in started to backfire when I am going down a hill or slowing down. It it my understanding that the short header=burnt exhaust valves theory is pointing toward that fact the exhaust system has a vacuum of sorts when you let off the throttle, hence the reason that engines with cracked or broken headers backfire under decel. Fun little car. The is an introduction to tuning with a programmable electronic fuel injection ECU. Eventually I would suggest an extended fuel screw for the FCR carb. This article is written for those of you having problems with exhaust decel popping. FiTech EFI Tuning Forum. Here's my build in a nutshell; - 1969 302 block bored. #21 Backfiring On Deceleration: Hello Group, One of the most asked questions pertaing to the Honda Elite CH 150/250 and CN 250 Helix involves a backfire through the exhaust on sudden deceleration. MSD Atomic erratic idle, stalling. Clockwise for more fuel, counterclockwise for less fuel. If the rain subsides I will FINALLY get to take my pickup and my FiTech out on the open road. With the system controlling timing, I was getting some exhaust backfiring on deceleration. The ideal Air-Fuel ratio for your engine depends on a lot of factors such as fuel used, engine mechanical setup and the engine operating conditions to name just a few. The backfire tends to happen while slowly accelerating when the A/F Ratio is 12. Now Steve is going to wonder what the hell I'm talking about when I pm'd him about my 3. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Fitech FAQ's - Zedmotive. com is a massive internet community hosting over 100,000 members and growing each day. If its not working it will pump air in the exhaust all the time which then makes it do that really annoying backfire pop thing on deceleration. Well I don't get any popping besides during shifts under a gerenous amount of acceleration. Something you should understand before going any further is that a motor in perfect tune will exhibit deceleration backfiring. When the diverter valve is no longer working and the pump still works it keeps pumping air into the exhaust during deceleration which causes a popping backfire sort of a thing. The FFR EFI in tank fuel system at $549 seems rather pricey if it contains only the pump and pickup, fuel pressure regulator and hoses, which is what I've been told. 0 all day long. Here's my build in a nutshell; - 1969 302 block bored. Created : 971013 Last updated: 981111 Editing notes for Andy Items to be bolded are starred. However, once I push in the clutch, the car will return to idle, then drop lower than the programmed idle, then die. com With the system controlling timing, I was getting some exhaust backfiring on deceleration. I have a slight stumble with a slight lean condition on acceleration on a smooth throttle input. Reset Idle Learn = The Idle Air Learning can be reset to a default value (16 steps) - by setting this control value to 1, and turning the key off and waiting for the system to completely power down. Deceleration back-fire, rough idle, and throttle lag can be quickly adjusted by tuning your carburetor. Incorrect timing can lead to the fuel being ignited before the manifold intake valve closes, causing a backfire through the carburetor or exhaust. Nothing between other gears or on hard deceleration. The AFR at that time is about 15:1 16:1, and corrects itself quickly to 13:1 Also have noticed a exhaust pop and a leaner AFR on closed throttle decell, at around 17 to 18. An engine running poor and out of tune will do this. No ifs ands or buts, that’s what causes it. I have a situation I can't seem to figure out. I can drive it all over hell and gone with no issues (except the backfire on decel that Fitech says cant be fixed) until I turn it off. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Went for some aggressive back road pulls. Just to check for a vacuum leak. If you want to get rid of the noise, you will need to de. On the fitech (top page 11on hand held definitions) you supposedly can adjust "afr loop speed" under the " fuel learn " which will in theory increase the speed in how quickly the fitech. Its not really a "lean pop"! That popping in the exhaust under decleration tells us two things; 1: The exhaust is hot, 2: The exhaust in the pipe (which as we are not applying load to burn the fuel contains some un-burnt fuel) is coming into a sorce of oxegen!. It's good to know what the engine does at 70 mph as well as during deceleration and idle. The car continually dies on deceleration. What setting is used to stop the popping from the exhausts?. This is basic overview of the most common setup questions. Open loop also uses maf meter readings which is slower. seems to have worked well. My fitech is hard to start some times (just cranks and cranks) after letting the fuel pump cycle and waiting for the injector "click". Installation requires no welding. Fuel cut control-popping on decel. What size cams and engines are you EFI/Fitech using? That's the same reason that manual trans cars often "pop/backfire" under deceleration. My turbo car backfires on decel ! Help ! I just got my 82`SC all together with the 1992 c2 turbo engine(CIS injection) and it backfires massively when you lift the throttle. The lean rpm surge is common in other two strokes, such as chain saws, and I don't think they even have float bowls. On the Pontiac forum they seem to lessen the ex popping by adjusting the Decel open IAC to some where between -10 and -30. Fitech FAQ's - Zedmotive. The is an introduction to tuning with a programmable electronic fuel injection ECU. On deceleration, if I keep it in gear, it will obviously continue to run. any common jetting size pms etc for this issue would be appreciated. Hi all,I'm getting a slight popping on decelerations once in a while and I'd like to know where I should start to address that issue. com for more info on our BMW F Series custom tunes. I am now looking to buy a wrecked GM truck that has a 5 or 6 speed manual trans in it so I can pilfer all the parts I need for my truck and never worry about that stinking automatic tans again!. Yes the FiTech has the IAC Decay setting which can quicken or slow down the IAC when you let completely off the throttle at a high RPM like I do. com 7 years (2007-2013) in a row, by a large margin, for the best message board of the year awards. So at full boost it showed 19 degrees but under load on a dyno it was actually found to be 27 degrees and that blew 2 head gaskets out. Upgrading to Gen III LS-Series PCM: Sensors and Inputs Guide includes instructional photos, checklists, and step-by-step instructions on upgrading to the GM Gen III LS-Series PCM, ECM, Electronics, and POWERTRAIN CONTROL SYSTEMS. High Altitude Compensation System If this is your first visit, be sure to check out the FAQ by clicking the link above. 0 Backfiring/Misfiring under load and part throttle the truck started to miss about every 10 miles of driving and about every 20 it would backfire/pop. I have been told that the diverter valves are difficult to find. It's been great here weather wise these last several days and I haven't been on the net but a few mins here and there. It is designed to remedy and prevent problems associated with the harmful carbon deposits (especially from the EGR gases that are recirculated in to the intake manifold). This feature is set at 2048 RPM by default however the setting is adjustable from 1280 to 3040 RPM. I have a fitech dual quad on my 511 stroker with a tunnel ram. After consulting with Fitech, I went back to using Distributor and vacuum advance, and using the system for fuel delivery only. That was an understatement if there ever was one. Zerys is a comprehensive content marketing platform that makes it easy to plan, produce, edit, and publish extraordinary content your readers will love. In the low rpm timing was fine but as soon as it hit over 4000 rpm the timing was out 8 degrees. You may have to register before you can post: click the register link above to proceed. I have been told that the diverter valves are difficult to find. Symptoms of a Bad or Failing. MASS AIR fuel injection system Ford 351M/400 -This fully programmable EFI processor comes with tuning software and USB cable for tuning through the OBD II connection. The Cutoff RPM is the RPM at which fuel is disabled, spark is cut or the ETC begins limiting and the Resume RPM is the RPM at fuel is re-enabled. Multipurpose Car Scratch Remover Cloth, Nano Car Paint Scratch Remover,Car Scratch Repair Kit for Repairing Car Scratches and Light Paint Scratches Remover Scuffs on Surface,Come. It starts cold just fine, then according to the dash temp guage, around 130 F a very, very loud vacuum rushing sound starts and then engine begins to shake like misfiring. anyway can i change this gasket myself? and is this the same. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: