Fitech Backfire At Idle

Fuel-injected engines are especially susceptible to problems with both fuel volume and fuel pressure. Edelbrock is the most respected name in performance. The FiTech system was really a disappointment; it had both mechanical & tuning issues, one exacerbating the other. To contact the administrator click here. I will have a local tech library setup shortly It will include Technical Documents, Firmware Updates, ProCal Installer T195B RevA « Last Edit: March 11, 2019, 05:16:26 PM by Wheelman ». An EFI conversion allows the engine to fire immediately with the first crank, to idle smoothly whether the engine is hot or cold, and to accelerate without any embarrassing pops, sputters or bogs. Just pulled trigger on FiTech Idle timing starts at 900 I broke a sparkplug today and swapped with a spare and now it won't run it just backfires through tail. ) Running winter fuel in warm weather. heres my issue, the driverside of this motor is running great, but the passangerside of the motor runs horrible, it runs really rich and blows blue smoke and when idleing it i will backfire out of that side shooting a flame out. But it seems to be inconsistent some. Even at initial startup it has a smooth idle. Easy Kit LS1 Carb Intake Kit - Edelbrock Victor Jr/MSD 6014 Ignition/Edelbrock 600 Carb. it definitely has a hard time staying cranked when the engine it cold. We design and engineer automotive fuel injection products for. We tweaked this a bit for when the engine warms up. I would check any accelerator pump for proper operation, due to it being on acceleration only. For example, if you rev to 3000 RPM from idle, it will not stay. Running fine one day, pulling away from the light and backfires back through the intake. All you fitech tuning guru's. The FiTech system was really a disappointment; it had both mechanical & tuning issues, one exacerbating the other. Our new content-rich platform now features a blog with updated tech information, tips for successful stress-free installation, in addition to sharing customer experiences and the latest industry news. With a retail price of just less than $1,000, it offers. The car would stumble as soon as the throttle was cracked open from idle. A carburetor has an accelerator pump, idle, main jets, and in most cases a power system that is designed to supply the correct air/fuel mixture for the engine’s demands. EDIT, ended up taking the meter plate off, giving it a scrub and clean. Fitech backfires at idle" Keyword Found Websites Listing Keyword-suggest-tool. Any of the above require a bunch of new wiring. Read honest and unbiased product reviews from our users. Welcome To The Turbo Forums. Going 60mph down the freeway, take it out of gear and coast, let engine spin down to idle, apply brakes, engine starts to die, let off brakes, idle comes back and engine runs fine. Fuel injector cleaning service and flow testing at Injector RX is cost effective and comes with guaranteed results. like an engine hiccup along with the hiccups i get backfires out of the exhaust and the throttle body. The idle and off-idle systems are the hardest part of the fuel system to get the fuel curve correct with a blow-through supercharger system, extreme care must be taken to properly size the idle fuel and air restrictions in order to obtain the correct idle and part throttle fuel mixtures. If the throttle blades are open too far, a poor idle and off-idle transition can be the result. You can either enter the values in the white boxes at the top and press enter, or click and drag the yellow boxes to the desired values. Setting timing for each specific engine is different; you must refer to the appropriate procedure for setting 'base timing' for that particular engine. FiTech had smthn like that. I now have my distributor hooked up with full timing control. With the CD design, the voltage sent to the coil positive terminal is always at full power even at high rpm. When It's Mechanical. thay took my hard earned money and said sorry to me. Rebuilt 400 stock internals- comp cam something like (NOT EXACTLY!!) 246-269 with. Stopped at a gas station to fill up with 93 octane, and when I put it in park, the idle was 1,500. Modern compressors are carefully designed and controlled. I drove it a few times. I also got the idle set a bit better. If pushing the accelerator does not prevent the engine from stalling, there is a problem with fuel delivery. The 429/460 Big Block Fords site is a site where enthusiasts can join and share there videos, information and. We have years of qualified experience to provide you the following services: Piano Moving, Piano Tuning, Climate Controlled Piano Storage, Piano Restoration, Piano Refinishing, Fire & Flood Remediation, Piano Sales, Piano Rentals, Piano. I hear backfiring but no pinging when I am at 42 degrees. The tach was buried and the engine was screaming. I don’t have a pressure gauge on the line, is there a reading on the FItech for fuel pressure? I didn’t see one. I have some tuning questions and will call after the holidays. 5, and wide open throttle is 12. The lack of FI is the only thing holding it back. It would pop from lean backfires under 3/4 or more acceleration. Have a slightly rough idle that steadily increases to a vibration or miss(?) at about 2-2500rpm. After hours and hours of tuning I got tired of spending money on it, so it sat for years. Not sure if it’s ignition, fuel or a vac leak but I sprayed around at idle and nothing changed. 8 and cars often "pop/backfire" under. It makes sense now that if I phased the rotor 10 degrees, my idle timing on the handheld would be around the 10 degrees I set it at. Car runs fine when cold, but once warm and if left idle, idles extremely rough and dies out when attempting to drive after warm up. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. Adjusted to 32* (2500 RPM) and backed out all the way on the vacuum advance (which could have been the source of the erratic idle AND the pinging). (1700-2500 RPM). Both kept defaulting to the HP numbers rather than CFMs. it definitely has a hard time staying cranked when the engine it cold. Running rich at ilde, black smoke and non responsive idle adjustment screws means you must be pulling gas from another circuit beside the idle circuit. Video, Talk about a Large Engine, World's largest Diesel Engine starting. I have always used the regular "straight" discharge nozzles, but was thinking of using the "tube" type this time around, mainly due to the claims of better fuel atomization. Cleans contaminated petrol injection systems, removes carbon deposits and deposits from fuel pipes, fuel distributors, injection and inlet valves therefore, no starting problems and no lean surging, smoother idling, good throttle response, low-pollution, and environmentally compatible combustion. It then uses that VVT data to determine the best valve timing for the current conditions. Richen up your idle mixture and turn the idle speed up. The only other I would consider is the Summit version. 8L/351 Ford small block Windsor Intake Manifolds, Fuel Injected and get Free Shipping on Orders Over $99 at Summit Racing!. then readjust the idle mixture. I called Fitech, and they said it sounds like an exhaust leak pulling air in and making the O2 sensor report incorrectly. You may have to register before you can post: click the register link above to proceed. So i believe that it has a burnt intake valve because when you try to rev the carb it backfires out of the carb and dies. Many customers who come to us learn that, despite a previous diagnosis, they don't need a new engine, only certain repairs or adjustments. 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. An idle system will have an idle jet/restriction that must be changed to supply the desired fuel mixture for idle and off idle engine demands. Hi, I have the 1200 power adder with a centrifugal supercharger, everything seems to be fine until I use more than half throttle, the Fitech seems to shut down or cut fuel until I back off, then it comes back too life again. At idle and cruise, the number of sparks fired is adjusted to maintain a total spark duration of approximate-ly 20 degrees (crankshaft), assuring smooth idle, improved throttle response, and eliminating the lean surge characteristic of some late model emission controlled vehicles. 12-24-13 09:56 PM - Post# 2410380 In response to boogie Make sure your wires are 1-8-4-3-6-5-7-2 and make sure timing is set at 0º or 2º with wire unhooked. ENGINE RUN-ON, DIESELING -- RO-101 DIESELING, that nasty tendency of an engine to continue to run on, coughing and sputtering, after the ignition is turned off and there is no more spark. Aug 30, 2016 #28. So far I’m happy with the swap. 38-4889 Dual Electric Cooling Fan Assembly provides increased horsepower and improved MPG. But it also took some serious fab work to get there. MSD has answered this demand with an updated and improved version of the popular 6LS box. Small Block V8 (221, 260, 289, 5. So, if the engine isn’t smoothly rotating, then this approach could “backfire. Idle issues gone. I have a Comp 270hr camshaft in the car and it idles steady at 15 on the vacuum gauge. However, at about 200 RPM, they start to advance the spark to reach the idle setting. Welcome to the Yellow Bullet Forums. It follows a typical path from the float bowl through the main jet, into what is called the idle well, which is a small. This is what FiTech uses at cranking, so, it seems to work. Read the Chevy High Performance magazine's technical article on adding tuned-port injection to a Chevrolet small-block V-8 engine. Only at www. I had it tuned, and I don't feel like that really did any better than the Pro-m tuning on the MAF. Find Holley Sniper EFI Self-Tuning Fuel Injection Systems 550-511 and get Free Shipping on Orders Over $99 at Summit Racing! Holley Sniper EFI self-tuning fuel injection systems from Holley deliver all the benefits—and none of the hassles. Unfortunately, these variables are all inter-related. FiTech EFI is dedicated to bringing the most advanced fuel injection systems on the planet supporting engines with up to 1200hp, 2X4, nitrous, boosted, and E85. A smaller “Decel RPM Decay” value will be SLOWER. The photos rightside up now; thanks Noobz. Our new content-rich platform now features a blog with updated tech information, tips for successful stress-free installation, in addition to sharing customer experiences and the latest industry news. So after 5 months of fussing with it, I gave up (not something I like to do) and purchased a Holley Sniper EFI system. Most of my rich issues were at off idle and transitioning to cruise level RPMs. Mine is a E85, single turbo blow-thru 360. FiTech had smthn like that. They have a FiTech forum that even FiTech themselves could probably learn a thing or three from IMO. Direct fuel injection systems operate at fuel pressures from 500 Psi at idle all the way up to 3000 Psi. I have had some success with FiTech system. I'm more of a reader than a listener. Overall it's pretty good. We are dedicated to engineering and manufacturing the safest, and highest performing turbochargers and accessories in the industry. I would check any accelerator pump for proper operation, due to it being on acceleration only. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. The decel backfire is gone, so I must have had something wrong with the locked distributor setup. AAA Piano in Northern California. " The MSD MSC coils are a direct replacement for your stock coils, and feature multi-spark capability when used with the 6LS. is a idle surge caused by too lean a mainjet, just. No engine fires every cylinder 100% of the time. Un-tie the string and allow the rpm's to come down. Also covers how to disassemble and rebuild any manual transmission. I thought that after seeing it run on 4 cyl engines which presumably move less air at idle than our 3. A carburetor has an accelerator pump, idle, main jets, and in most cases a power system that is designed to supply the correct air/fuel mixture for the engine’s demands. Rated #1 Content Marketing Platform. ) but the main thing that has really let me down is the crappy. Hg less than what your engine has at idle. ENGINE RUN-ON, DIESELING -- RO-101 DIESELING, that nasty tendency of an engine to continue to run on, coughing and sputtering, after the ignition is turned off and there is no more spark. Stalling out and wont stay running. As for the ECU, FiTech mounts it directly to the throttle body, and all necessary sensors are either part of the throttle body – like air temperature, throttle position sensor, idle air control valve, and fuel injectors – or they are included, such as the wide band O2 sensor and the cooling temperature sender. The administrator has banned your IP address. Plus or munus the FiTech idle correction timing. Just for ppl to go to so they can read up on tuning procedures and troubleshooting. Troubleshooting Your Holley Carb August 2, 2017 Wayne Scraba Fuel Delivery , How-To and Tech Tips , News 1 Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They’re the standard of performance, and without question some of the most popular and easily tunable. • Click on the Idle Speed tab at the top. com Contact Us | FiTech Fuel Injection. A faulty ignition system is a possible cause of a engine backfire. I am able to adjust the timing tables. When It's Mechanical. 100's of Chevy crate motors!. I decided on the Retrotek Speed Boss EFI 750 CFM system for a few reasons: 1. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle. Find helpful customer reviews and review ratings for MSD 2900 Atomic EFI Master Kit at Amazon. Fuel injector symptoms for bad, faulty, dirty, clogged, leaking injectors: poor starting, idle, performance, fuel consumption, failed emissions, detonation. In fact, I believe the Holley HP/Dominator ECU is more sensitive to idle tuning (idle algorithm), than the Commander 950 is; meaning it's easier to achieve a good idle with the C950. So after 5 months of fussing with it, I gave up (not something I like to do) and purchased a Holley Sniper EFI system. Not sure if related. txt) or read book online for free. After consulting with Fitech, I went back to using Distributor and vacuum advance, and using the system for fuel delivery only. Running fine one day, pulling away from the light and backfires back through the intake. You may have to register before you can post: click the register link above to proceed. Issues with the fuel system of a vehicle can be frustrating to no end. Completely random backfire through throttle body. Replied by T-Rex in H-Town on topic Hard Start After Ignition Timing Usually, hard starting occurs when the ignition timing is too advanced, not retarded. bad timing. It had straight leg boosters and a secondary metering plate so it only had so much adjustment that could be performed. I am looking at a Fitech EFI for the Molvo, and when I read the reviews, one of the big revelations is that the car no longer. I am able to adjust the timing tables. Car did run noticeably better, but still missing. I didn't want to mess with it cause it's out of my realm of experience. So i believe that it has a burnt intake valve because when you try to rev the carb it backfires out of the carb and dies. chevyhiperformance. If the engine RPM is outside the idle cell,. Let it idle for about 15-20 mins as I had other stuff to do. and msd can kiss my tail pipes. Find Holley Sniper EFI Self-Tuning Fuel Injection Systems 550-511 and get Free Shipping on Orders Over $99 at Summit Racing! Holley Sniper EFI self-tuning fuel injection systems from Holley deliver all the benefits—and none of the hassles. The computer sends a signal to a solenoid on the timing cover. 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. com Contact Us | FiTech Fuel Injection. To contact the administrator click here. Backfiring in any motor is either badly out of time or a burnt valve. Also note that there is a lead on the FiTech for an idle speed increase when the AC compressor engages. you can buy another box for 200 plus. This system involves a high pressure oil pump and an IPR (Injection Pressure Regulator). Higher idle is usually a sign that the throttle plate is not Holley Sniper EFI and RobbMC Surge Tank, 351c and FMX. However, there’s roughly 90 degrees of crank rotation since the last (base timing) crank trigger. Second priority is going to be making sure your IAC steps are between 3 and 10 at warm idle. Run-on by dieseling is caused by fuel in engine igniting without spark. I called Fitech, and they said it sounds like an exhaust leak pulling air in and making the O2 sensor report incorrectly. the "nearly" is that it does have some hiccups in idle, and it idles at 600 RPMs. Also any input on the backfire and stall. This video illustrates something the instructions don't tell you. 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. this is exactly what happened to me (26 yrs ago). Above 3,000 RPM, the HI-6 gener-ates a single powerful. 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. So responsive it's insane. The FiTech system was really a disappointment; it had both mechanical & tuning issues, one exacerbating the other. Our new content-rich platform now features a blog with updated tech information, tips for successful stress-free installation, in addition to sharing customer experiences and the latest industry news. Engine's are inefficient when cold and will require a lot more fuel, so that may be what's masking the symptoms until warm. I have always used the regular "straight" discharge nozzles, but was thinking of using the "tube" type this time around, mainly due to the claims of better fuel atomization. After consulting with Fitech, I went back to using Distributor and vacuum advance, and using the system for fuel delivery only. My idle air-fuel ratio is 13. When the throttle is opened, or the RPMs approach idle, or some other thing causes more load on the engine, the fuel injection returns. Completely random backfire through throttle body. side exhaust pretty badly when you let off the throttle during the "blip". If the engine RPM is outside the idle cell,. I will have a local tech library setup shortly It will include Technical Documents, Firmware Updates, ProCal Installer T195B RevA « Last Edit: March 11, 2019, 05:16:26 PM by Wheelman ». Pops through the exhaust. The reference to the job where we hooked up the timing control is a case for the above. I think MOST 70s Cad EFI owners don't want a huge project, they don't their cars out of service a long time, they don't to become tuners, they. Two-speed dual fan rated and American made. AAA Piano in Northern California. i like to set it as low as possible with engine still running smoothly. 9L gas engine. Start the engine, the engine will run very slowly more like a tractor. Welcome To The Turbo Forums. Edelbrock is the most respected name in performance. I've had the turbo since 2006, but I couldn't tune out a bad lean backfire problem with the blowthrough carb. Even at initial startup it has a smooth idle. Running an MSD 2 wire dizzy locked out. I think MOST 70s Cad EFI owners don't want a huge project, they don't their cars out of service a long time, they don't to become tuners, they. Went for the first test drive yesterday and it didn't want to shift right, on the way back home it started shifting okay. I found the issue to be my distributor not properly seated. With EFI, the idle speed is not changed by the throttle plates. I've had the turbo since 2006, but I couldn't tune out a bad lean backfire problem with the blowthrough carb. When it failed, the backfires it caused cost me damn near the entire dual exhaust system on a motor home! Now that was an expensive R&D effort - for me!. I'm having issues with backfires through the throttle body. Lmc Ford Truck Catalog - Free ebook download as PDF File (. During the aftermath of Irma my 6k generator started backfiring like shotgun blasts, mind you this was at 3 am , want to talk about waking up the neighborhood. Now this 570 is a lean carb , but does it's job out of the hole. A huge difference from before. The engine is a 385 stroker, 10. Additional features include: * Choice of three fuel inlet. Register Log In First Generation Firebird Forums Tech Help General Log In First Generation Firebird Forums Tech Help General. Turbo this setup/blow thru carbs? is a lot more potential than atleast what I've found of the e303, I'd still like to use the e303 just for the lopey idle, this. Thought it was a lean pop. It was so good, as near as I can tell, it isn't offered anymore. Higher idle is usually a sign that the throttle plate is not set up properly or you have a faulty IAC motor. 5 AFR - target with GREEN mode When you start your vehicle we refer to this as being in IDLE condition. ) Running winter fuel in warm weather. Mine is a E85, single turbo blow-thru 360. I also change the idle loop up/down to 30 each, not really sure how much that helped. On Saturday I brought home a 1983 Suburban K20, which I got for a song and a dance. The computer senses engine load. 5 power valve. 4:1 cr, Comp 280h cam 230/230. At idle and cruise, the number of sparks fired is adjusted to maintain a total spark duration of approximate-ly 20 degrees (crankshaft), assuring smooth idle, improved throttle response, and eliminating the lean surge characteristic of some late model emission controlled vehicles. Also, if you car sat for that long, your carb is due for a rebuild for sure. Then came some backfiring. You will surely get a real bang for the buck!. Have a slightly rough idle that steadily increases to a vibration or miss(?) at about 2-2500rpm. You will want to use a PV that is 2-3 in. Aug 30, 2016 #28. I have to run idle at 14 and 1100 at 13. FAST is the leading developer of electronic fuel injection systems, EFI components, intake manifolds, tuning tools for high performance and street applications. I called Fitech, and they said it sounds like an exhaust leak pulling air in and making the O2 sensor report incorrectly. Vic SR was a racer and made products with that in mind Jr is a business man selling what is junk in my opinion. And I know customer service is flooded with calls. I noticed right away that I did not smell the stick of a lean running engine and the place on the ride where I dump the clutch and slow down on the hill into the neighborhood I did not get the typical backfiring that happens every other time. Both kept defaulting to the HP numbers rather than CFMs. Fitech needs to setup a forum board for customer support. txt) or read book online for free. I recently swapped out my old analog 6a box for a new 6al digital box with 2step rev control. FiTech EFI is dedicated to bringing the most advanced fuel injection systems on the planet supporting engines with up to 1200hp, 2X4, nitrous, boosted, and E85. I could still use my stock intake manifold (which is factory), and if I ever get around to upgrading that stock manifold to an Edelbrock Pontiac Performer manifold, I can still use this fuel injection system. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. Hi, I have the 1200 power adder with a centrifugal supercharger, everything seems to be fine until I use more than half throttle, the Fitech seems to shut down or cut fuel until I back off, then it comes back too life again. ” The MSD MSC coils are a direct replacement for your stock coils, and feature multi-spark capability when used with the 6LS. • Click on the Idle Speed tab at the top. i have a 1978 jeep cj5 and i had a 1978 AMC 304 out of a jeep rebuilt from ground up and the jeep has fenderwell headers. FAST EZ-EFI Poor Fuel Mileage and exit the truck will run at a faster idle speed for some reason. With the system controlling timing, I was getting some exhaust backfiring on deceleration. It could even be an Ethanol-related problem - vapor lock. Adjusting this setting will help idle quality and takeoff from an idle. Truck runs nearly perfect at all other times. A Very Special Ford GT40. I now have my distributor hooked up with full timing control. I thought that after seeing it run on 4 cyl engines which presumably move less air at idle than our 3. When you shift into gear and drive at a low mph we refer to this as being a LIGHT CRUISE. Just pulled trigger on FiTech Idle timing starts at 900 I broke a sparkplug today and swapped with a spare and now it won't run it just backfires through tail. I pulled the valve covers off and found a flat exhaust lifter and a broken intake pushrod. Unfortunately, these variables are all inter-related. [Archive] Page 15 This forum covers all engine questions, including intake and exhaust discussions. All you fitech tuning guru's. 0 HO and AOD swapped in it. Like Millhouse, I can get the car to start and idle with the stock EEC dizzy with timing locked out. A few misfires are to be expected under these conditions, and should cause no major performance problems or significant increase in emissions. This is what FiTech uses at cranking, so, it seems to work. 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 truck starts great runs great however have a few problems. Set them for the idle and leave them until you change the main jets. No engine fires every cylinder 100% of the time. Vacuum gauge shows 18. 14,791 likes · 142 talking about this · 119 were here. I pulled the valve covers off and found a flat exhaust lifter and a broken intake pushrod. If anyone can tell me what can cause Backfiring through the throttle body that would be nice. The tach should have a low-scale readout that is sensitive to increments of at least 50 rpm. 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. However, at about 200 RPM, they start to advance the spark to reach the idle setting. Adjusted to 32* (2500 RPM) and backed out all the way on the vacuum advance (which could have been the source of the erratic idle AND the pinging). As you said BBA, glowing headers is a result of fuel burning in the primaries, so what do you think "little idle timing" is, especially at -8* (aka: 8* past TDC = spark is igniting as the piston is going down, resulting in a completion of combustion as the exhaust valve opens). The fuel injection system is designed for applications making at least 6 inches of vacuum at idle. 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. I have some tuning questions and will call after the holidays. All this translates into an improved combustion process in the engine's combustion chamber that you will feel in throttle response and a smoother idle along with better high RPM performance. From this point the idle speed can be increased to the point where the transfer slot becomes over exposed. I have a similiar problem as devin, my 95 Sierra 4x4 it has a 350 5. Not too much info online and Fitech service is off and on. Then one day I found the Fitech website. When I switch to the 2 wire MSD and Fitech controlling the timing, the car is extremely difficult to start and keep running, it backfires out the "carb" and out the back. So I'd like to learn things on my own pace and refer back to it often without bugging ppl. Usually run my idle on 350 at 700 RPM and up. 88 Larry Sattler's 1968 GMC Truck See inside for story. How do you set the ignition timing on a ford probe gt 95 with an mx engine?. There are limits set up within the ECM that only allow it to move the IAC in and out of the idle air passage so far. Catless exhaust, EFI, stink? 1 2. If not a guess I have to add a gauge but it doesn't sound right since there is no stumble what so ever except for when you barely touch the pedal off idle or in traffic when you get on the pedal again with that light touch. The domestic aftermarket performance world has been abuzz about the latest low-cost EFI systems, one of which is Holley’s new Sniper EFI. I tried to disregard what I thought I knew about idle tuning and start with a fresh mindsetI'm glad I did. ” The MSD MSC coils are a direct replacement for your stock coils, and feature multi-spark capability when used with the 6LS. The system can adjust idle no problem. An idle air motor would require major mechanical changes to the throttle body setup. Above 3,000 RPM, the HI-6 gener-ates a single powerful. thay took my hard earned money and said sorry to me. 4:1 cr, Comp 280h cam 230/230. The administrator has banned your IP address. With everything I knew to try exhausted I was drawing a blank when I thought of the perfect thing to try next – swapping his FiTech unit for mine. 1985 Mustang Carbie. • Click on the Idle Speed tab at the top. On the *lean* deal what I was seeing is that there is insufficient fuel to ignite in the cylinder (with just idle circuit feeding it) so it goes unburned into the pipes where it accumulates then ignites due to maybe another cylinder that does fire of from a hot spot in the exhaust system. And I know customer service is flooded with calls. Both kept defaulting to the HP numbers rather than CFMs. 429/460 Big Block Fords has 26,244 members. They have a FiTech forum that even FiTech themselves could probably learn a thing or three from IMO. The pedal is too high and too sensitive off idle, but no big deal. Vacuum gauge shows 18. Your Catalog of Accessories & Parts for Chevrolet Truck GMC Truck Blazer, Jimmy & Suburban 1/2 Ton, 3/4 Ton 1967-72 2017 SUMMER EDITION CB. 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. FiTech is definitely the smaller of the two and the more likely option to work. The vehicle will most often not run well, idle poorly, accelerate erratically, have excessive fuel consumption, and backfire because the MAP sensor and throttle position sensor are not operating together and giving false input to the ECU. A huge difference from before. Engine is popping thru throttle body starting at 2000rpm. But it seems to be inconsistent some. For example, if you rev to 3000 RPM from idle, it will not stay. Both kept defaulting to the HP numbers rather than CFMs. Replied by T-Rex in H-Town on topic Hard Start After Ignition Timing Usually, hard starting occurs when the ignition timing is too advanced, not retarded. Stalling out and wont stay running. That's when my engine got a bad case of the may as wells. ENGINE RUN-ON, DIESELING -- RO-101 DIESELING, that nasty tendency of an engine to continue to run on, coughing and sputtering, after the ignition is turned off and there is no more spark. Idle Return: If the engine is not returning to idle quick enough for your liking or is dropping too quickly and killing the engine then you may need to adjust the rate at which the injection system comes to an idle. Basically, this trouble code sets if the ECM cannot make the engine idle at a set (desired) speed by control of the IAC valve’s position. Check the vacuum lines connected to the intake manifold. Pro-Flo 4 is not just a replacement for your carburetor, it's a complete engineered system that provides the ultimate in performance, drivability and quality. 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 don't like their products.