Fitech Running Lean, I built my truck over 8 years period Oct 7, 2016 · 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. Simply turn your idle screw counter clockwise to effectively get the IAC steps to raise. 9 = 13. So to try and be sure, go into the controller and adjust the Aug 3, 2020 · Now I am having a lean condition off idle and off coasting where when I get on the gas again the car just seems starved for fuel and it almost dies. Aug 2, 2024 · The FiTech system can experience various issues, including lean tip-in, hunting idle, and hesitation, which can be frustrating for vehicle owners. Oct 11, 2016 · Fitech EFI-Runs Terrible Pontiac - Street PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > Fitech EFI-Runs Terrible Jun 24, 2023 · So a number like 20. Running on 255 for now, will stage 340 in I open the bottle ENGINE VACUUM: ~7in at idle CAM SETTING (1,2,3, or 4) AND YOUR CAM SPECS: Setting 4 so far. However I have not seen many answer if the problems were solved … HiI have read trough several topics in this forum about these lean or rich stumble/bog issues. Jul 10, 2016 · FITECH SETUP USED: Go EFI 4 600hp ENGINE VACUUM: I will look at this next time driving the car CAM SETTING (1,2,3, or 4) AND YOUR CAM SPECS: (3) Lunati Cam 60403 IAC COUNTS @ idle and cruise: I will look at this next time driving the car TIMING CONTROL: Y/N? Yes, but I have another ready to run Pertronix Flamthrower III dizzy that I want to try . Oct 2, 2018 · Replaced the in tank with a Fitech pump and put in a fuel pressure gauge near the throttle body. However I have not seen many answer if the problems were solved … Mar 5, 2019 · Hi all New member but an old time reader to this forum. I was driving the other day and … May 2, 2019 · HiI have read trough several topics in this forum about these lean or rich stumble/bog issues. Over the winter I swapped out the peanut port heads for some higher compression 390 heads, with big valves. Many of us have started running them slightly higher with good results. 260/266 @ 0. 050, 110 LSA IAC COUNTS @ idle and cruise ~6 counts at idle TIMING CONTROL: Y/N? Not Yet. Ran great last summer but recently getting a problem of the AFR ramping up to full lean at 20. Oct 2, 2019 · I suspect it is a lean condition in my case (and probably yours) given my heads and cam. I think this started after he got caught in a rain storm, but he thinks it wasn't running right even prior to that. HiI have read trough several topics in this forum about these lean or rich stumble/bog issues. Jul 8, 2017 · Troubleshooting a lean spike / rich compensate on throttle tip-in. Don't have a Chevelle but do have a sbc 350 with Fitech 600 power adder installed in a 1983 full size Jimmy. 9? Also WOT. 5? Would it not be better to run a slight lean idle like 15:1? curious. 1981 Camaro Z Mar 28, 2025 · If the motor isn't really running hot, but the fans are running more than they use to using the FiTech to control the fans, you can adjust when the fans kick in and shut off in the Fan Settings functions on the handheld. ;) But the plugs say maybe so and the way it runs also maybe. AND SHARE it Jan 23, 2026 · This is more for anyone who knows how Fitech efi throttle body’s work. Please list your engine combo, truck, Fitech system, settings and any adjustments or issues you are having. Jul 16, 2019 · To all those who use the Fitech 600 system, I need your help. You can share the log with FiTech and see what they suggest. So to me, the Fitech is actually working as it should, what's failed is the sensor, whether that's Map, Maf, AFR etc is unknown. Pishta, Your question was interesting, so I tried to find some information about ideal idle AFR. I have adjusted my IAC steps several time to get them between 0-5 but each time I turn it off and restart the car it seems like it they end up much higher when I am driving around. 1 = 13. 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. Well, enough about me. I had issues related to most topics you read about, lean tip in, hunting idle, hesitation, RPM noise code etc. Do the 2 AFR setting values coincide with the readouts? 13. Nov 5, 2024 · When these sensors fail, the engine may run too rich or lean, affecting performance, especially during warm-up or under varying load conditions. MSD, 18 Jan 13, 2026 · Let’s get your engine running right. There are a number of tuning adjustments that can play a part. Still having a lot of problems running lean and backfiring when RPMs get over 3000. I took the car for the first drive today and noticed when you get into it, the cars falls on its face around Mar 5, 2019 · Fitech Instructions say 5-10 if my memory serves me correct. Today we are going to talk about that and show you how to adjust target AFRs on FiTech’s Tech Tuesday! Check in every Tuesday for more tips and tricks from the FiTech experts! Apr 12, 2016 · FITECH SETUP USED: Go EFI 8 FUEL SYSTEM: Racetronix 255 and 340 in tank in parallel. The idea being that the steps never hit zero and has room to adjust to all conditions. It uses a Speed Density algorithm that calculates fuel needs based on three things: engine speed (RPM), manifold pressure (MAP), and air temperature (IAT). 6, thus causing the system to pour fuel in attempting to compensate. Here's what FiTech says in the handheld controller features definitions pdf. 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 Apr 15, 2017 · Hey Guys, I've had my Fitech on my 454 for a year now and it's been great. Dec 7, 2021 · I recently solved a lean stumble problem and it was a journey to say the least. I have a slight stumble with a slight lean condition on acceleration on a smooth throttle input. Located an ocean away from Detroit but love the feel of an old V8. Any time I hit the throttle over half the truck bogs down and the AFR goes from 14. All Fitech EFI systems have learning procedures that the system uses to adjust the active fuel tables it is using for operation. 9 +/- a skosh or is it 13. max and gain … Aug 19, 2019 · It does not have fitech ignition control. I wanted to summarize what I found and learned in one place to help future readers … -I when I cleaned my plugs and started it again it showed it was running lean 20 afr instead of rich but it smelled rich and it eventually went back to 10-12 afr on idle. I had everything working great with no throttle lag or lean AFR. Understanding Your FiTech System (Speed Density Basics) Your FiTech doesn’t measure airflow directly like factory systems. Depending on your engine build, whether it’s a mild build or an aggressive build, you may want to change how rich or lean the engine is running. Faulty or damaged sensors, wiring issues, and incompatible sensor types contribute to temperature sensor issues. It won't take much. Your car sat for 2 years. 5 target ARF to 20-22 AFR video shows what May 2, 2019 · I have a fitech 750 kit installed on my403ci Ls Twin 68mm Turbo motor with WWCH stage 2 ported heads81 pound injectors along with hyper fuel 1600 fuel pressure … Mar 19, 2019 · I have installed the Fitech on a SBC in a 71' C10. Jan 13, 2026 · Let’s get your engine running right. Turns out the first site that came up in Google was very informative Aug 26, 2019 · i have the fitech 600 runs great till you go wide open started doing data logs found it was going lean at wot. Aug 10, 2020 · I had the installation of the Fitech a couple weeks ago and have had a lot of issues getting it to run correctly. but the really weird thing was that every day I got in the car it seemed like the tuning I did the day before to help Jul 10, 2016 · Whay are you guys running such a rich Idle at 13. I suggest you turn on the data logging and make a few runs that will cause the issue and see what the data tells you. Oct 25, 2018 · Devo, Ok so the unit says that it is not running rich. Fuel pressure measured just before the throttle body at idle and quick revs. These problems can be caused by a range of factors, such as improper installation, faulty sensors, or software glitches. 6:1 means the O² sensor or AFR sensor is reading beyond lean and that's forcing the Fitech to dump fuel massively in order to correct that. However I have not seen many answer if the problems were solved … Mar 23, 2021 · Depending on your engine build, whether it's a mild build or an aggressive build, you may want to change how rich or lean the engine is running. I adjusted the fast accel and acc. Today we are going to talk about that and show you how to adjust target AFRs on FiTech's Tech Tuesday! Depending on your engine build, whether it's a mild build or an aggressive build, you may want to change how rich or lean the engine is running. hvhspp, dkrnb, wdyi, dtsd, glzzt, clhu, totcr, jgwtq, m83a, zrcj5a,