High stft at idle

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August undefined, 2024

WebJun 15, 2024 · From a cold start without touching the gas, as soon as the O2 sensors start reading, the STFT start pulling fuel and adding to the negative LTFT until they get to around -18%. Each time the STFT hits the most negative point, it will reset to 0 causing a bit of idle surge, before going negative, then resetting back to 0, it continues to loop ... WebAug 11, 2024 · The STFT varies between -4 and +6 LTFT is at 14.8% at idle will go to 25-27 at 2000 RPM. Slightly hard to start and diesels a bit at shut off Idles at 900 RPM with or …

Throttle opening at idle, high positive trims - Acura MDX SUV …

WebFeb 6, 2024 · Since the long-term fuel trim seems to go high at idle, a vacuum leak is the thing I would suspect. ... As soon as you hit the leak the STFT will go negative and in a hurry. Then replace what you find is wrong. Share. Improve this answer. Follow answered Feb 5, 2024 at 20:38. vini_i vini_i. 16k 1 1 gold badge 38 38 silver badges 59 59 bronze ... WebAug 24, 2024 · LTFT now ranges between 11% and 20% at idle. It hangs around 10% under revving and 4-7% under load; this has not changed since before the repairs that have been … how to set ntp on windows server

High STFT @ idle Toyota Nation Forum

WebApr 30, 2024 · High STFT are usually caused by a vacuum leak or a bad MAF. Did you use a AC Delco Genuine GM MAF on the replacement one? Aftermarket ones are not reliable. … WebJul 10, 2024 · If the STFT rises higher than plus 15-20% at idle, but drops at higher rpms, most likely you have a vacuum leak. If the STFT is close to zero at idle, but elevates to 15-20% at higher rpms, the problem could be caused a faulty mass air flow sensor, clogged catalytic converter or low fuel pressure (bad fuel pump). WebJan 5, 2024 · Since I did this, my ltfts after the initial warming up are 20%ish. They continue to stay that way unless under load which then drop to 5-8%. Oddly, my stfts after warming … how to set null value in oracle

High LTFT at idle, no vac leak Bob Is The Oil Guy

LTFT and STFT values are off and don

WebOct 1, 2024 · At idle I still have high STFT/LTFT, but no codes. After ridding the car for 60 miles, I was pleased to notice that the LTFTs dropped on both banks to 1-3% but STFT are 10-11%. I am afraid that if I will let the car idle for 30-40 min, the LTFT will go higher. WebOct 12, 2024 · While on idle, OBD2 continuously read STFT (short term fuel trim) high at 10 to 30%, again with similar numbers for both banks. After 5 minutes of idling, the engine … how to set null value in jsonWebOct 10, 2024 · Both idle condition and open throttle condition, O2 sensor reports normal conditions. When returning to idle from an open throttle condition, LTFT stays -20% and … notebook tariff code

"WebJan 26, 2024 · If there’s a malfunction in the fuel system, the levels of fuel entering the engine can be too high or too low, which would cause a rich or lean scenario. Oxygen … " - High stft at idle

High stft at idle

Code P0171 - System Too Lean: Symptoms, causes, common …

http://www.boosttown.com/electrical_system/stlt_fueltrim.php WebWHAT CAUSES HIGH LTFT - Answered by a verified Chevy Mechanic ... If you notice a change in idle, you've found your leak. Be careful not to spray this stuff around ignition components (distributor, wires, coils, etc) as a spark leak can ignite the spray. ... HI BRAD CARLZ 136 RPM 670-710 /ECT 198/IAC 36/BARO PRE 31/ENG LOAD 3 /IPW 4.6-4.7 /LTFT ...

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WebThe fuel trim values will be high at idle and would clean up in higher operating ranges. It’s possible to see slightly elevated fuel trim values at higher operating ranges on MAF sensor-equipped vehicles, but this would … WebAug 25, 2024 · If FTs are high then it is running lean (system is adding fuel) - too much air (vac leak) or not enough fuel (low RFP). To me high idle would certainly indicate the former. Paul. 2005 ZX4 SE 2.0L Duratec 5-speed 197K miles. 2002 Wagon SE 2.0L Zetec 5-speed 145K miles (scrapped) J.

WebAug 25, 2024 · If FTs are high then it is running lean (system is adding fuel) - too much air (vac leak) or not enough fuel (low RFP). To me high idle would certainly indicate the … WebMay 27, 2024 · STFT eventually follows within seconds of the LTFT to being high readings. This consistently starts when car is under light load. Typically around 5 - 7% throttle. ... Idle, Medium load or WOT I have no issues. It seems to be at very light throttle that will send O2 into flat line .9 volt reading first, with fuel trims to follow a few seconds ...

WebNov 17, 2024 · Even if your STFT's are just a few points positive at idle, it may indicate a leak. Let the car idle and carefully spray short bursts of brake cleaner/carb cleaner around the intake and the blower and see if the engine responds. It would also change your STFT's if you can look at a scan tool while spraying. WebJan 9, 2024 · Restriction on fuel filter or fuel ines will cause lean mixture at higher loads and RPM generally not so much at idle. Low fuel pressure from a bad pump usually affects crank time at cold start but less than 0.5 bar (7psi) drop can have a big effect on fuel trims. " We're trying to plug a hole in the universe, what are you doing ?. "

WebDec 18, 2016 · Load at idle is irrelavent. Except if it's to low when you start the car it will not switch into idle strategy. It'll fire up and idle over 1000 RPMs and it'll be stuck in spark …

WebAt both idle and 2500 RPM, after engine warm up, the post-cat short fuel trim is hovering about 50%. The post-cat o2 sensor switches with a lot less of a voltage difference than the pre-cat. The STFT pre-cat drops to about 1% at engine warmup. how to set null values dataframeWebDec 24, 2024 · The only issue is at idle the LTFT bank 2 is around 11.7. Bank 1 is 4.8. When going 65 @ 2000 RPM both banks are often exactly the same around 11. STFT works perfect around 0, jumping ± 4. In addition the O2 sensor voltages seem normal jumping around from .2 to .8 volts on both banks… notebook tchiboWebJun 29, 2024 · The LTFT on a cold engine at idle starts at +1.6. As the engine warms to operating temperature the LTFT creeps up to 21.9 at idle. This seems to go up in line with … notebook tags printableWebJun 30, 2024 · STFT was at 4% MAF 2.8 warm 3.8 cold changed oil, and replaced homemade CAI with stock air box and replaced in-cabin air filter STFT shot up to 27.3% and LTFT hangs out around 30% immediately after doing above maintenance. Noticed huge hole in upper air boot (I probably made it bigger, when replacing CAI with Stock) notebook tasche guessWebDec 20, 2024 · High STFT At Idle. Hey Guys, Having some issues with my tune right now and after a few revisions with my tuner the fuel trims at idle are still pretty high (15-20%). Looking for suggestions. FBM turbo kit. I have looked over all the intake piping and cannot find a leak. Manifold pressure at idle is around 0.32 bar, vacuum at idle is -19 mm/Hg ... how to set nth bit in c notebook tasche rotWebDec 4, 2013 · A useful diagnostic tool is to determine if the fuel trim problem exists in more than one engine operating range. Fuel trim should be checked at idle, at 1,500 rpm and at 2,500 rpm. In addition to these no-load checks, drive the vehicle at various steady load conditions and watch for fuel trim variation. By Underhood Service Staff Writers notebook tcon