Fitech Backfire On Deceleration

The concept of implementing an auto-tune / closed loop / self mapping fuel control system has also become prevalent in the after-market tuning industry. Backfiring on engine deceleration is most often caused by a lean mixture. The MSD Ignition features a capacitor which is quickly charged with 520 - 535 volts and stores it until the ignition is triggered. Hey guys cheers for the add. Backfiring is typically a too-rich condition. Installation requires no welding. Gerry Hutch speaking to Prime Time on the 13th of March 2008. I am assuming it is an anti back fire ball check to save the diaphram. FiTech recognizes that not everyone needs or has 600HP or a wild camshaft. The accelerator pump is responsible for providing the momentary additional fuel needed under. 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. I have played with he settings, currently crank 20f= -10. Noise starts at about 30 MPH, does not go away, cycle of noise increases with vehicle speed, in or out of gear. What setting is used to stop the popping from the exhausts?. This after-fire is a by-product of backfiring through the exhaust, something that was a common sight in older car models. No noise on deceleration, or with "hard" braking while at steady speed. 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. if not, do that 1st. KEYTRUDA may be a treatment option for your advanced melanoma, which means that the cancer has spread or cannot be removed by surgery. mention that with the cats removed and on deceleration followed by a hard acceleration all the unburnt fuel in the exhaust explodes. com 7 years (2007-2013) in a row, by a large margin, for the best message board of the year awards. I have had several issues that FiTech had me re-flash to fix. The first test was against a heavier (4. It's amazing how the puffing of exhaust coming out where it's not supposed to sounds like a "tick". If the diverter valve isn't working on the smog pump that will cause a popping in the exhaust especially on deceleration. Understanding the Backfiring Mechanism. I wanted to buy a complete kit so I went with the external pump. 4L Power Stroke Diesel - 08 6. Advanced melanoma that has spread to other parts of the body is also called stage 4 melanoma. A backfire out of the exhaust system is caused by a ratio that is too rich (too much fuel). Chris, Maybe you can give some input on the hot start problems. I now get a gunshot like backfire on deceleration (slow or sudden deceleration). there is nothing about deceleration that causes an engine with a big or small cam to stall. Am currently building an ls1 into a r32 skyline and wanting to run a stand alone ecu. 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. All Fitech EFI systems have learning procedures that the system uses to adjust the active fuel tables it is using for operation. From what I've read, it only self-learns the fuel mixture and then, only at relatively constant speeds. Deceleration needs. I saw a video last week from FiTech about it. An open exhaust allows additional air to be "sucked up the pipe" during closed throttle and any unburned fuels, then ignite and "snap/crackle. So responsive it's insane. Flowmaster Sprint Car Alcohol Race Muffler, Aluminized Steel, 3. You will need to more fuel to eliminate or lessen the popping. These kits via Marken Performance, come with everything you need for a self tuning induction system: from billet aluminum throttle bodies to fuel injectors and all the sensors required. Timing, start-up, acceleration and deceleration all need to be programmed the old-fashioned way. The fitech has to power wires, one heavier red wire that will stay hot all the time and a second smaller red wire that is supposed to be connected to something that goes hot when the ignition switch is turned on. This allows some unburned fuel vapor into the exhaust manifold or stack. Bryce - FiTech Tech Pro. It doesn't seem to do it as much if acceleration is initiated from a rich condition (blue on the handheld). My truck has been to 4 different trans shops whose charges ranged from $1500 to $4500 for what were each temporary short term 'fixes'. The problem was in the fitech timing system. Engine's are inefficient when cold and will require a lot more fuel, so that may be what's masking the symptoms until warm. • backfiring on deceleration I have the FiTech and is going through a similar issue as yours. An open exhaust allows additional air to be "sucked up the pipe" during closed throttle and any unburned fuels, then ignite and "snap/crackle. To REDUCE (it may not totally go away) popping on deceleration first make sure that you do not have any intake or exhaust leaks. If the air cutoff valve(s) is working properly and you still have backfiring on deceleration, something is causing a lean condition. Hi yall, got the 702 heads on in place of the 292's, 702's are short turned, bigger intake valves, an isky 8005 springs. Steps so far: 1. Acceleration is very good as is the idle. That was an understatement if there ever was one. Fitech cold start issue keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website. Are any other plugs that clean like #4 or is it just #2? I have an issue with intake gaskets on my engine. It would idle or even while. 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. However, once I push in the clutch, the car will return to idle, then drop lower than the programmed idle, then die. The harder I let the car brake with the engine rpm's, the louder the backfire. Anyone notice when starting the engine, there maybe a noise from the exhaust that sounds like a pop (kinda like backfiring)? The noise also has the following "characteristics": 1) It happens sometimes, but not often. The mystery is where that lean condition is coming from. Looking forward to running it in the car soon. I've had the best luck with advancing the timing45-50 degrees is what I generally do under hard decel so the burn is complete after the exhaust valve opens. I have checked exhaust gasket and vacuum lines and all looks good. The Fitech runs fine on dual plane intakes, however a single plane is "supposed to" be better for overall fuel distribution since all 4 barrels open at the same time. I think the self learning is over rated. Is there a difference in when for troubleshooting purposes? e. When decelerating in gear, the MAP is very low, which means the fuel pulsewidths are very small. Noticeably better than before. DFCO stands for Deceleration Fuel Cut Off. You arrive at the correct plug by checking to see the side electrode is lighter in color halfway to the center open end of the electrode - after running it. We have dominated the annual polls at CompetitionPlus. pot is designed to slow down the closing of the throttle to prevent backfiring. I was never a genius at timing optimization before anyway. Fitech Efi systems are self learning and with a few basic settings will run and learn as you drive out of the box. It's amazing how the puffing of exhaust coming out where it's not supposed to sounds like a "tick". We usually refer to an exhaust backfire as a "backfire", and backfiring through the carb as "spitting" or "coughing". FiTech recognizes that not everyone needs or has 600HP or a wild camshaft. In this article, we'll discuss engine idle issues, surging and "hunting" problems. EnzoPerformance. The check valve lets air into the bellows when the. Also, torque is not even desired, so, fuel can be cut off. Going to take the bike out again tomorrow afternoon for a little riding and some test/tune. Looking forward to running it in the car soon. When decelerating in gear, the MAP is very low, which means the fuel pulsewidths are very small. Any more ideas? I did change my o-rings with the injectors, but again I don't have the symptoms that Yellow4g63 mentioned anyways. It now cuts the fuel out earlier. Defective air pump diverter valve. FiTech has the Ultimate efi Induction Systems for LS1/LS2/LS3/LS6/L92 engines. This weekend I plan on testing it out. X-Style Crossover Pipe-Full Length bolt-in CORSA s X-style Crossover Pipe design provides balanced side-to-side exhaust flow and increased performance and reduces the idle burble and deceleration p. Installed my second FiTech system on a friends car a 2 weekends ago. How to solve engine hesitation and stumble problems on the 90+ By Steve Chong. Sometimes if there are outside problems such as bad misfires, exhaust leaks, or any other situation that could cause poor readings on the O2 sensor, the system will try to compensate in order to keep the car running. Dramatically improved drivability over the WAY too big Demon 850 that was on it. Currently it seems to be randomly blowing white smoke out the tailpipe mainly on acceleration esp from a stop. 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. Start work on my efi install. My only tuning issues at the moment are idle and deceleration. 4 white smoke, turbo knocking on decel - I have a 08 stock 250 w/ the 6. Do you have the FiTech controlling the ignition or is the ignition a stand alone. 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. It was an easy fix once I new where to look and what all the settings controlled. The first test was against a heavier (4. Rated #1 Content Marketing Platform. The Fitech runs fine on dual plane intakes, however a single plane is "supposed to" be better for overall fuel distribution since all 4 barrels open at the same time. Fitech Efi systems are self learning and with a few basic settings will run and learn as you drive out of the box. Fitech cold start issue keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website. 5" exhaust does the same thing actually. The car idles fine, runs fine under light to moderate acceleration but when you pound the pedal the enging cuts out and seemed to even backfire once. I attempted to set the static timing to 15 degrees, and that resulted in an instant backfire out the exhaust. Fuel Injection, Carburetion & Fuel System - FiTech info, adjustment and problem thread - Hey guys, got the idea from another forum as a way for us FTE guys to share tips and tricks on the Fitech go EFI systems. I was told to change it in increments of "10" when I make the changes. My only tuning issues at the moment are idle and deceleration. Read more here to find out what you need to know to tune your engine properly with the ideal AFR for your engine and operating conditions. The decel backfiring in the exhaust is from having too much fuel when backing off the throttle. Went for some aggressive back road pulls. Deceleration back-fire, rough idle, and throttle lag can be quickly adjusted by tuning your carburetor. Mainly happens under hard acceleration and wide open throttle, although it has cut out a time or two going from 1st to 2nd w/o wide open throttle just fast climbing rpms. March 15, 2017. Oh and did I. To all those who use the Fitech 600 system, I need your help. ; pop on decel is lean, pop on up shift is rich? I am running my '13 Vic Vegas with TTI, ATS at +4, shotty Vic swepts, and VFCIII at 4, 2, 1, 0, 5. In the low rpm timing was fine but as soon as it hit over 4000 rpm the timing was out 8 degrees. That was actually the second test. I might still have a small leak at a gasket on passenger side, but driver side was oil free this time and passenger wasn't smoking, but still had some drips on cement( maybe just residual). Slowing down or whatever doesn't pop whatsoever. At high RPM, the injectors and spark can be cut off at the Rev Limit RPM in order to prevent the engine from overspeeding and causing. The decel backfiring in the exhaust is from having too much fuel when backing off the throttle. I was told to change it in increments of "10" when I make the changes. Support Articles » Technical Articles » Other Tech Articles » How To Check and Set Up Base Ignition Timing How To Check and Set Up Base Ignition Timing This step occurs after ensuring that your base ignition settings are correct and the car starts, but before actually taking the car for a drive or presenting load to the motor. ,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. Just like with a new carb, you must. A backfire in the intake manifold is caused by a ratio that is too lean (not enough fuel). MSD Atomic erratic idle, stalling. You will need to more fuel to eliminate or lessen the popping. 1996 Honda Fourtrax 300 acts like it has water in fuel. 0 all day long. The second smaller wire is what tells the fitech to shut down when you turn the key off. backfiring with flame through throttle body was created by highlander Hello to all Any help, would be greatly appreciated, let me start by starting at the beginning. I was told to change it in increments of "10" when I make the changes. Use this chart to find the right Fitech product for your car. The accelerator pump is responsible for providing the momentary additional fuel needed under. It now cuts the fuel out earlier. I would check any accelerator pump for proper operation, due to it being on acceleration only. This, in turn allows some unburned fuel to get into the exhaust pipes. This after-fire is a by-product of backfiring through the exhaust, something that was a common sight in older car models. There is a large group of enthusiasts who are happy with their ZZ4 crate engine or their '66 Mustang's factory engine, but still want the advantage that EFI has to deliver. First let's cover the "basics" in terms of the possible causes of engine surging/hunting, where engine speed suddenly (or slowly) changes. with the decel unless your engine braking and don't like the popping through the. 00" Out (O) Same Side, Each: Flowmaster Alcohol Race Mufflers The Flowmaster Alcohol Race Muffler incorporates patented strategically placed "burn holes" inside the muffler in all low pressure areas to prevent damage from excess methanol fuel from puddling and backfiring on deceleration. if not, do that 1st. The check valve lets air into the bellows when the. Fuel cut control-popping on decel. DFCO stands for Deceleration Fuel Cut Off. What size cams and engines are you EFI/Fitech using? That's the same reason that manual trans cars often "pop/backfire" under deceleration. Hearing the sound of the exhaust popping under deceleration when a neighbor pulled into their driveway late at night was enough to convince Gary Meadors, founder of Goodguys Rod & Custom Association, that he was going to get a cool car when he was older. Fun little car. I have a slight stumble with a slight lean condition on acceleration on a smooth throttle input. That was an understatement if there ever was one. 1st Generation Specific (1979-1985) - 1979-1985 Discussion including performance modifications and technical support sections. I was told to change it in increments of "10" when I make the changes. Excertps from the September issue of Chevy Rumble Magazine, by Henry P. I might still have a small leak at a gasket on passenger side, but driver side was oil free this time and passenger wasn't smoking, but still had some drips on cement( maybe just residual). I had very slightly stretched the O-ring (because it kept popping out of the groove due to being just under diameter) and lubricated it with silicone grease. 2005-08 C6 Corsa Perf. Are any other plugs that clean like #4 or is it just #2? I have an issue with intake gaskets on my engine. Just some ideas. I would try spraying brake clean or carb clean around the base of the carb and at the intake gaskets. The PCM monitors the corresponding changes in the TPS, MAP and MAF sensors. A high quality wire harness is CRITICAL. There is a large group of enthusiasts who are happy with their ZZ4 crate engine or their '66 Mustang's factory engine, but still want the advantage that EFI has to deliver. Personally, if it wasn't a vert, I'd go for the GT500, hands downalthough I don't care for the ad much. On throttle, my Fitech works incredibly well. Advanced melanoma that has spread to other parts of the body is also called stage 4 melanoma. pot is designed to slow down the closing of the throttle to prevent backfiring. Had to add fuel to the accel at 65 and 170 degrees to keep it from bucking if you stabbed the throttle quickly. We have dominated the annual polls at CompetitionPlus. 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. I got the IAC set to 3-10 after normal warm up and the car runs fine now after getting warm. Regarding the confusion on Mr 42 s crankcase ventilation post Crankcase ventilation is needed to take care of piston ring blow-by. This is basic overview of the most common setup questions. The decel backfiring in the exhaust is from having too much fuel when backing off the throttle. 5" exhaust does the same thing actually. Also, torque is not even desired, so, fuel can be cut off. Richening the mixture. Fitech The 1967 - 1972 mapping of 20-1 AFR as you let off the pedal helps in decal backfire issues. We design and engineer automotive fuel injection products for. Get the best deals on Car & Truck Carburetor Parts when you shop the largest online selection at eBay. 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. I replaced the start jet with the 62. -currently starts and runs but will not drive. The engine also has a very high amount of internal EGR, which causes combustion to be very difficult. Zerys is a comprehensive content marketing platform that makes it easy to plan, produce, edit, and publish extraordinary content your readers will love. I now get a gunshot like backfire on deceleration (slow or sudden deceleration). The vent line has a check valve in-line and an air filter to keep dirt out. If the diverter valve isn't working on the smog pump that will cause a popping in the exhaust especially on deceleration. Engine backfire is caused by an imbalance in the air-to-fuel ratio of the vehicle. Created : 971013 Last updated: 981111 Editing notes for Andy Items to be bolded are starred. This weekend I plan on testing it out. 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. All Fitech EFI systems have learning procedures that the system uses to adjust the active fuel tables it is using for operation. Start work on my efi install. 5 If the muffler shop missed even a tiny little spot on the welds it will suck air and pop on. I had very slightly stretched the O-ring (because it kept popping out of the groove due to being just under diameter) and lubricated it with silicone grease. Living with a blow thru,, LOL. anyway can i change this gasket myself? and is this the same. What size cams and engines are you EFI/Fitech using? That's the same reason that manual trans cars often "pop/backfire" under deceleration. Installed my second FiTech system on a friends car a 2 weekends ago. 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. Ben Moses's DET with 2. Open loop also uses maf meter readings which is slower. DFCO stands for Deceleration Fuel Cut Off. 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. there is nothing about deceleration that causes an engine with a big or small cam to stall. 2005-08 C6 Corsa Perf. Slideshow: Electric cars are undoubtedly quick, but often run out of "gas" at the top end. Chris, Maybe you can give some input on the hot start problems. The check valve lets air into the bellows when the. The harder I let the car brake with the engine rpm's, the louder the backfire. 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. These kits via Marken Performance, come with everything you need for a self tuning induction system: from billet aluminum throttle bodies to fuel injectors and all the sensors required. I have been pointed in the direction of the fitech ls stand alone series 70050 and am just wondering if anyone is running one and has any feed back on the system at all. During certain situations, the injectors can be turned off. So I bought the fitech power adder 600hp kit to put my turbo on. pot is designed to slow down the closing of the throttle to prevent backfiring. Got the charger out sunday for a drive with the Fi tech system on it and for the first time out it ran pretty good. This is not the same engine that I was posting about earlier. Eventually I would suggest an extended fuel screw for the FCR carb. Hearing the sound of the exhaust popping under deceleration when a neighbor pulled into their driveway late at night was enough to convince Gary Meadors, founder of Goodguys Rod & Custom Association, that he was going to get a cool car when he was older. FiTech EFI Tuning Forum. Borla'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 deceleration in most fifth generation Corvettes. Recently my FiTech started to not want to start when hot. You may have to register before you can post: click the register link above to proceed. so I cleaned it and same thing,replaced it and no change took it to a machanic and pulled up 2 lean codes. FiTech has the Ultimate efi Induction Systems for LS1/LS2/LS3/LS6/L92 engines. But while the C5 embodies a near-perfect combination of style, acceleration, and handling, its power-robbing, insipid-sounding stock exhaust system is a major weak point. Less valve train noise for sure. You need to get rid of 1 of them to cure it. 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. with the decel unless your engine braking and don't like the popping through the. Deceleration needs. Nothing between other gears or on hard deceleration. This allows some unburned fuel vapor into the exhaust manifold or stack. It is commonly found on many older vehicles that are equipped with carburetors. Support Articles » Technical Articles » Other Tech Articles » How To Check and Set Up Base Ignition Timing How To Check and Set Up Base Ignition Timing This step occurs after ensuring that your base ignition settings are correct and the car starts, but before actually taking the car for a drive or presenting load to the motor. Hi yall, got the 702 heads on in place of the 292's, 702's are short turned, bigger intake valves, an isky 8005 springs. It - Answered by a verified Auto Mechanic. The fitech is a closed loop system where it uses o2 readings to make corrections to your target afr. Fitech cold start issue keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website. 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!. Deceleration needs. The Fitech runs fine on dual plane intakes, however a single plane is "supposed to" be better for overall fuel distribution since all 4 barrels open at the same time. I would check any accelerator pump for proper operation, due to it being on acceleration only. First, it might be an exhaust leak. The mystery is where that lean condition is coming from. With this knowledge you should be able to make adjustments on almost any style of. Regarding the confusion on Mr 42 s crankcase ventilation post Crankcase ventilation is needed to take care of piston ring blow-by. Works with stock or aftermarket mufflers. A backfire out of the exhaust system is caused by a ratio that is too rich (too much fuel). These kits via Marken Performance, come with everything you need for a self tuning induction system: from billet aluminum throttle bodies to fuel injectors and all the sensors required. The check valve lets air into the bellows when the. Richening the mixture. This normal tendency is controlled by the air cut-off valve(s) operation. 9, 65F= -16. Hearing the sound of the exhaust popping under deceleration when a neighbor pulled into their driveway late at night was enough to convince Gary Meadors, founder of Goodguys Rod & Custom Association, that he was going to get a cool car when he was older. Any time the exhaust is “opened up” the condition of deceleration pops is MUCH more noticeable and problematic. The 1968 Volkswagen Type 3 (Squareback, Fastback, and Notchback) was the first car produced with Fuel Injection as stock equipment. What steered me away from normal carburetors is that they are not easy to setup correctly by the normal person and either can run to lean or too rich. anyway can i change this gasket myself? and is this the same. Main metering jets in the. Before you work too hard to find one test the diverter valve on the pump. 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. 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. When decelerating in gear, the MAP is very low, which means the fuel pulsewidths are very small. can withstand 14. The lean rpm surge is common in other two strokes, such as chain saws, and I don't think they even have float bowls. Hi yall, got the 702 heads on in place of the 292's, 702's are short turned, bigger intake valves, an isky 8005 springs. Thankfully we got that car all sorted out. The decel backfiring in the exhaust is from having too much fuel when backing off the throttle. Deceleration Mode: When the driver releases the accelerator pedal, air flow into the engine is reduced. Backfiring on deceleration is generally caused by a lean condition. Use this chart to find the right Fitech product for your car. 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. I've been checking on different forums trying to get info on Fitech tuning. Installation requires no welding. Idle seemed much smoother as well. Although i'm thinking of moving back to a double pumper carb or fitech efi one day so speak to me like i'm a 4yo as I was diagnosed with brain tumor a year ago or so and have a hard time articulating when typing or speaking and I've also forgotten more than I ever learned. FiTech, Riverside, California. On the Pontiac forum they seem to lessen the ex popping by adjusting the Decel open IAC to some where between -10 and -30. A faulty ignition system is a possible cause of a engine backfire. 5 If the muffler shop missed even a tiny little spot on the welds it will suck air and pop on. Less valve train noise for sure. Slowing down or whatever doesn't pop whatsoever. No ifs ands or buts, that’s what causes it. The car idles fine, runs fine under light to moderate acceleration but when you pound the pedal the enging cuts out and seemed to even backfire once. That was an understatement if there ever was one. It - Answered by a verified Auto Mechanic. It will drop RPM's way too low. Please help so I can get riding soon!!. Are any other plugs that clean like #4 or is it just #2? I have an issue with intake gaskets on my engine. The second smaller wire is what tells the fitech to shut down when you turn the key off. CORSA's XO-Pipe design provides balanced side-to-side exhaust flow and increased performance and reduces the "idle burble" and deceleration popping common to most C6 Corvette models. 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. The accelerator pump is responsible for providing the momentary additional fuel needed under. KEYTRUDA may be a treatment option for your advanced melanoma, which means that the cancer has spread or cannot be removed by surgery. Two questions for you guys that have installed the FiTech system. I have a situation I can't seem to figure out. 2005-08 C6 Corsa Perf. That was actually the second test. Only cuts out under load with throttle near wide open. I have installed the 600 Kit and Command Center a few weekends ago. Burble feature now available on our tunes upon demand. On subsequent attempts it started backfiring in all directions; out the exhaust, through the throttle body, and through the crank case, sending my PCV valve and breather cap into orbit. Open loop also uses maf meter readings which is slower. Main metering jets in the. Let off the brakes and the engine comes back idle. The software version in my unit was an outdated version. Use this chart to find the right Fitech product for your car. RAIV cam, with Rhodes lifters, performer intake, ported cast iron manifolds, 2. It will drop RPM's way too low. My question is on cold start. Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. Now, after cleaning the bits of aluminum dust from everything, I could assemble it. Gerry Hutch speaking to Prime Time on the 13th of March 2008. I have had several issues that FiTech had me re-flash to fix. It is the perfect complement to the CORSA Sport exhaust system. YellowBullet. View attachment 580103. Deceleration Mode: When the driver releases the accelerator pedal, air flow into the engine is reduced. On my initial try, it ran for a few seconds and died. last year when I got my 1979 GL1000 running , I was trying to sync the carbs and found that one of the carbs had double the vacuum than the other carbs I was able to sync the other 3 but that one is still double the vac. • backfiring on deceleration I have the FiTech and is going through a similar issue as yours. The Fitech runs fine on dual plane intakes, however a single plane is "supposed to" be better for overall fuel distribution since all 4 barrels open at the same time. Works with stock or aftermarket mufflers. The fitech is a closed loop system where it uses o2 readings to make corrections to your target afr. com 7 years (2007-2013) in a row, by a large margin, for the best message board of the year awards. Fitech Efi systems are self learning and with a few basic settings will run and learn as you drive out of the box. Backfiring on engine deceleration is most often caused by a lean mixture. 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. As for stalling under decel, have you looked at where your IAC position is at idle?. X-Style Crossover Pipe-Full Length bolt-in CORSA s X-style Crossover Pipe design provides balanced side-to-side exhaust flow and increased performance and reduces the idle burble and deceleration p. Is there a difference in when for troubleshooting purposes? e. I've been checking on different forums trying to get info on Fitech tuning. Hi yall, got the 702 heads on in place of the 292's, 702's are short turned, bigger intake valves, an isky 8005 springs. There is a large group of enthusiasts who are happy with their ZZ4 crate engine or their '66 Mustang's factory engine, but still want the advantage that EFI has to deliver. High Altitude Compensation System If this is your first visit, be sure to check out the FAQ by clicking the link above. When the gasket starts to go bad I get a popping through the exhaust under deceleration. My truck has been to 4 different trans shops whose charges ranged from $1500 to $4500 for what were each temporary short term 'fixes'. 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. Built from 2 1/2" mandrel-bent 16-gauge stainless steel. Following some distributor work on my 390 last year, I had a similar experience: a fouled plug, popping on hard acceleration and lack of smoothness while cruising. 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.