High negative ltft

WebMar 19, 2024 · The LTFT is positive but the STFT are negative and it may not have had enough run time to bring the LTFT back down. Verify fuel pressure too. At idle, with the FPR vacuum line unhooked and with the engine under load. Make sure it's within spec. 2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy. WebFeb 3, 2024 · Using an OBD II scan tool, high positive long term fuel trims caught my attention: ~10% for Bank 1 and ~13% for Bank 2. There is consistently a small difference in LTFT between the banks. Short term fuel trims are centered around zero, typically within +/-5%, with the rare spike to something more (negative 10-15%), possibly when the …

High Negative LTFT 2016+ Honda Civic Forum (10th Gen)

WebApr 30, 2024 · LTFT refers to changes in STFT but averaged over a longer period of time. A negative fuel trim percentage indicates a taking away of fuel while a positive percentage indicates an adding of fuel. A normal long-term fuel trim reading will appear to stay the same, giving a long-term average of fuel added. WebJan 27, 2024 · Negative LTFT was created by Tondt 2002 Ford Escape 3.0 has -20 LTFT and 20 STFT at idle or coasting. More RPM LTFT and STFT go to much smaller numbers but again cancel out. Should I be worried that LTFT and STFT are so high or is it more important that total fuel trim is 0? No DTC, no misfires, no hesitation, no problems. tso shop login https://scarlettplus.com

LTFT and STFT values are off and don

WebDec 24, 2008 · LTFT Max Negative Value. In good engineering practice, what would be the most negative value LTFT one would run? i.e. is -10 to -4 acceptable? ( (The issue, friend … WebNov 16, 2024 · keith November 16, 2024, 7:31pm 7. The long term fuel trim is comparing the actual fuel trim (fuel pressure x duration of the pulse) to a table of theoretical values stored on a table in the computer that was derived from the engineers at the manufacturer. The actual fuel delivery during closed loop (engine warm) is determined by the O2 sensors ... WebNegative fuel trim percentages indicate the PCM is attempting to lean out the fuel mixture, to compensate for a perceived rich condition. STFT and LTFT percentages are the adjustments made by the PCM to maintain the 14.7:1 ratio. ... LTFT for most vehicles will remain more stable, adjusting over a longer period of time. On some vehicles, if ... tso shop roadcraft online

Long-Term Fuel Trim High at Idle: Causes and Fixes

Category:Why Long Term Fuel Trims Remains in Negative?

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High negative ltft

LTFT and spanner wrench light Chevrolet Cruze Forums

WebMar 30, 2024 · LTFT-B2-30.4% The B2 LTFT is always high, unless I nail the throttle, then it drops for only a moment. What does this indicate? At 2000 and 3000 rpms, the reading differences are similar, but lower. STFT-B1- negative 0.7% LTFT-B1-7.8% STFT-B2-0% LTFT-B2-22.6% Air filter is clean, Airflow sensor is clean, O2 Sensors B1-S1 and B1-S2 both give ... WebJul 24, 2024 · The LTFT levels are stubbornly around -11% at idle and ~ -5% at 2500 rpms. So, the ECM is detecting a persistent rich condition. ... before the throttle body, can cause air to leak out of the intake plumbing, and that can also cause the high negative fuel trims you see. When that happens, it's almost always worse at higher speeds, when the air ...

High negative ltft

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WebOct 23, 2024 · Negative LTFT should produce running rich codes with stock calibrations. Fuel pressure seem high, 55psi at idle, measure vacuum at pressure regulator. Compare with another intake manifold source. ... High negative ltft's. By kissmyss in forum 3.8L V6 Supercharged (L67)(L32) Replies: 10 Last Post: 08-05-2024, 05:02 PM. WebDec 4, 2024 · When descending a hill in a lower gear where the engine is revving a little high as the engine is doing some braking, the LTFT drops to maybe %5. I would think a vacuum leak would produce even higher fuel trim during this condition. Both the MAF and O2 sensors are old. I'll probably just replace them both.

WebAug 13, 2024 · Nothing unsual but one thing, high negative LTFT (about minus 20 to minus 30 at idle). The secondary o2 sensor, was stuck at 1.25 volts, so I tought it was that and replaced it, didn't really changed much on the high readings but not it moves and it's not stuck. I replaced also the injectors today, also been told that looked like at least one ... WebJul 9, 2013 · Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty …

WebJul 30, 2024 · Usually will get between -3% - -7% (depends on how high the LTFT was before). This is when it’s usually the coolest in terms of temperature. On my drive back home after work, my LTFT will shoot back up and usually gets as high as -16%. WebDec 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 …

WebNov 24, 2024 · Vvt gear, timing chain , vvt solenoid, and chain tensioner were changed. Check engine light is off and vehicle out of limp mode. But there is still a negative LTFT of …

WebNov 23, 2024 · What Causes Negative LTFT Values? Negative fuel trim is caused by ‘richer’ combustion than the ECM of PCM predicted. Here are some common causes of negative … phinma oracleWebDec 4, 2013 · If the LTFT for bank 1 is 20% and the LTFT for bank 2 is 3%, the source of the problem is associated with bank 1 cylinders only. The diagnosis should focus on factors related to bank 1. If an engine vacuum leak is suspected, inspect the intake manifold and vacuum hoses for leaks. tso shoesWebJul 21, 2024 · Each car maker is different, but the general rule is that a LTFT of +25% or -25% indicates a serious problem. Let’s take a look at the … phinma nursing tuition feeWebAug 17, 2024 · Recently, about 2 weeks ago, I let the engine idle for a few min as I always do before driving away cold, I got a CEL and it was a P0440. I cleared the code and all was … phinma ownerWebJan 11, 2016 · Negative LTFT's with the engine warm, low RPM. In other words, if left uncorrected, the engine would be running too rich. Common reasons for this include over … phinma radWebOct 12, 2024 · Today I unplugged the MAF sensor, disconnected the negative battery pole for 10 minutes and started the car. While on idle, OBD2 continuously read STFT (short … phinmar contractingWebAug 26, 2016 · HolyToledo. I replaced every single rubber tube, plugs, ccv, disa, all the usual stuff, and still had high multiplicative fuel trim on inpa at around +10 on both banks. I had fixed all the vacuum leaks, so I started looking more closely at o2 sensors and maf. At idle, short term fuel trim was negative, and on throttle, it went positive, to ... tso shop online