P0171 Diagnostic Trouble Code Discussion for November 2016
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 1997 Mercury Grand Marquis GS 4.6L Poor Idle Quality, MIL Lamp on VIN: 2MELM74WXV P0171: System lean bank 1. Hi guys, I have this Merc with lean codes for both banks. when it first came in it was reading LTFT+25, STFT0 at idle and LTFT0, STFT+40 off idle it will change as soon as the throttle is opened and the BARO reading was 131hz so I cleaned the MAF that already ... |
November 01, 2016 | |
| 1997 Mercury Grand Marquis GS 4.6L Poor Idle Quality, MIL Lamp on VIN: 2MELM74WXV P0171: System lean bank 1. Hi guys, I have this Merc with lean codes for both banks. when it first came in it was reading LTFT+25, STFT0 at idle and LTFT0, STFT+40 off idle it will change as soon as the throttle is opened and the BARO reading was 131hz so I cleaned the MAF that already ... |
November 02, 2016 | |
| 1996 Nissan Pickup SE 2.4L Poor Idle Quality, MIL Lamp on VIN: 1N6SD16Y2T P0171: Fuel Trim Lean (Bank 1). The truck came in with the CEL on, p0171 & p0505 and the idle normally 775 +/- 50 but several times a minute dropping to 550 - 600. The truck runs great in open loop but when it leaves open loop it goes into open loop/drive and the idle starts fluctuating.... |
November 03, 2016 | |
| 1998 Ford F-150 XL 4.2L Excessive Emissions VIN: 2FTZF1723W P0171: Fuel system lean bank 1. Vehicle will not go into closed loop for more than a couple of seconds if at all. When it does ST fuel trims go -30 but oxygen sensors don't reflect this change. Inducing a large vacuum leak improves engine idle but oxy sensors still red over 0.8volts. I am le... |
November 04, 2016 | |
| 2005 Ford Freestyle Limited 3.0L Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 1FMDK06165 P0171: bank 1 lean. ok this one started with lean codes on both banks and I found a small hole in the plastic manifold so I fixed the hole with some jb weld and cleared the codes, now the engine read lean on bank one only and the fuel trim go's up when you accelerate from 12+ to ... |
November 04, 2016 | |
| 1998 Ford F-150 XL 4.2L Excessive Emissions VIN: 2FTZF1723W P0171: Fuel system lean bank 1. Vehicle will not go into closed loop for more than a couple of seconds if at all. When it does ST fuel trims go -30 but oxygen sensors don't reflect this change. Inducing a large vacuum leak improves engine idle but oxy sensors still red over 0.8volts. I am le... |
November 05, 2016 | |
| 2004 Ford Explorer NBX 4.0L MIL Lamp on, P0174, p0171 VIN: 1FMZU73K04 P0171: System too lean bank 1. Hello all, I am stumped on this one. Constantly sets long term fuel trim at +25 on both banks. It will come down 2 or 3 points at cruise speed but goes right back to +25 at idle. With the downstream O2 sensors replaced the degraded condition of both cats was r... |
November 10, 2016 | |
| 2012 Chevrolet Cruze LS 1.8L MIL Lamp on VIN: 1G1PC5SH4C P0171: fuel trim system lean. ... came in because of the engine light on. Code P0171 was present with no other concerns. I first smoked the intake and did not find any leaks. I then scoped the MAF sensor and the wave form matched the form found in the library. I also sprayed staring fluid ... |
November 17, 2016 | |
| 2013 Chevrolet Malibu LT 2.5L MIL Lamp on VIN: 1G11C5SAXD P0171: lean. Car runs lean at idle LT 26 ST 16 cruise speed they improve a little LT 13 ST 9. I checked for a vacuum leak by spaying suspect areas with carb cleaner ST fuel trim never changed [I reset the trims before diagnois]. MAF reads 2.45 gr at idle.The only pid that ... |
November 23, 2016 | |
| 2008 Ford Escape Hybrid 2.3L Poor Fuel Economy, MIL Lamp on VIN: 1FMCU49H98 P0171: Lean bank one. I need help guys, pulling my hair out on this one. found all the listed parts failing and installed said parts, no change!! ten seconds after start up STFT maxs out at 45% and LTFT eventually climbs up enough to turn on MIL. unplugged MAF and no change in fuel... |
November 27, 2016 | |
| 2011 Chevrolet Cruze LS 1.8L Poor Idle Quality, MIL Lamp on VIN: 1G1PC5SH0B P0171: fuel trim system lean. Vehicle came in with ses light on code p0171.St and lt fuel trims maxed.Plugged vacuum line to valve cover fuel trims are normal.Removed line at throttle body should there be a restriction or orifice in TB for pcv line |
November 29, 2016 |
