Web24 de ago. de 2024 · Had a vac leak and IAC valve stuck open, LTFT was ranging between 11% and 25% at idle, no CEL. Fixed vac leak, replaced IAC valve, reset ECU. 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 done. WebThe sensors that read the exhaust require a voltage of 0.2 to 0.9 volts. If those volts change, the ECU adds fuel or subtracts fuel with the injector pulse width. That width is the fuel …
Fuel trim for diagnostics Vehicle Service Pros
Web10 de jul. de 2024 · If you have a scan tool, check Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) readings at idle and at higher rpms (read more about fuel trims below). Normally, both LTFT and STFT should be close to zero. If the STFT rises higher than plus 15-20% at idle, but drops at higher rpms, most likely you have a vacuum leak. WebP0171 - very gradual fuel trim increase at idle. Issue is specific to idling for long periods, like 30+ minutes (unfortunately, this is not something I can avoid doing semi-regularly). First clue of a problem was after idling in a parking lot for over an hour - stalled out when I put it in reverse, but after a couple tries starting, was able to ... phonics game tricky words
Code P0171 - System Too Lean: Symptoms, causes, common …
Web22 de out. de 2024 · I went down the same rabbit hole chasing down high fuel trims. If memory serves LT was in that range at idle as well. You probably already did this - but the snorkel near the air box can be the source of a vacuum leak. Also the connections on the brake booster line. I never did check fuel pressure, but continuity wise the injectors … Web15 de jun. de 2024 · At Idle, short term fuel trim bank 1 is about 10-18%. As I increase throttle to 1500 rpm, then 2500 rpm and higher, short term fuel trims will drop down to … Web5 de jan. de 2024 · Fuel trims under load were +20 ltft while cruising in 6th at 60mph. 0 fuel trim at WOT. I ran the car down to half a tank babying it and added 2 more gallons of 91 … how do you undisable an iphone 7