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P0171 Diagnostic Trouble Code Discussion for December 2007

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6GF10U5Y P0171: System too lean. ... Lexus! It started as a regular P0171 with a bad AMM but just refuses to cooperate with the normal fixes. It came in originally I replaced the AMM due to visibly dirty hot wires. I road tested it and the LTFT's were around 10-12 which I didn't like but we w...	December 03, 2007
	2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6GF10U5Y P0171: System too lean. ... Lexus! It started as a regular P0171 with a bad AMM but just refuses to cooperate with the normal fixes. It came in originally I replaced the AMM due to visibly dirty hot wires. I road tested it and the LTFT's were around 10-12 which I didn't like but we w...	December 04, 2007
	1998 Volvo S70 T5 2.3L Stall, Poor Fuel Economy, MIL Lamp on VIN: YV1LS5348W P0171: Fuel Trim lower limit. ... ECM-231/ P0171 code. Fuel pressure is good. We have tried a new air mass meter, front O2 sensor, and ECM out of another T5 that runs fine. Data stream shows all data the same except air flow. The car that runs good shows 12 kg/h at idle and 46 kg/h at 2500...	December 04, 2007
	2001 Nissan Sentra GXE 1.8L MIL Lamp on VIN: 3N1CB51D41 P0171: Fuel Trim Lean. cleared code numerous times .code comes right back switched front o2s still code po171b [bank one sensor 1 long term fuel trim @ 38% both banks not much info on mitchel on demand any specs. for mass air flow sensor in grams per sec	December 06, 2007
	2001 Nissan Sentra GXE 1.8L MIL Lamp on VIN: 3N1CB51D41 P0171: Fuel Trim Lean. cleared code numerous times .code comes right back switched front o2s still code po171b [bank one sensor 1 long term fuel trim @ 38% both banks not much info on mitchel on demand any specs. for mass air flow sensor in grams per sec	December 07, 2007
	2001 Nissan Sentra GXE 1.8L MIL Lamp on VIN: 3N1CB51D31 P0171: Fuel Trim Lean. This car set the codes at 58 mph. Checked for vacuum leaks, none found. Suspected mass air flow sensor, when checking the mass air flow we found it to be dirty. Cleaned mass air flow wire with brakeclean, reinstalled and now sets code P0100, mass air flow circ...	December 11, 2007
	1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1JC5244V P0171: Fuel System Lean (Bank 1). ... no-start pulled plugs found them fouled with fuel and worn replaced plugs got vehicle to start but ran very bad and no power watched data on mentor found timing adv all over the place pulled front cover found tensioner in pieces and timing two teeth off re...	December 13, 2007
	2002 Ford Windstar 3.8L MIL Lamp on VIN: 2FMZA55472 P0171: lean bank 1. these codes can be cleared & mil light stays off for weeks at a time & then no apparent reason comes back / customer has not noticed driveabilty issues or poor fuel mileage. thanks for any info.	December 13, 2007
	1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1JC5244V P0171: Fuel System Lean (Bank 1). ... no-start pulled plugs found them fouled with fuel and worn replaced plugs got vehicle to start but ran very bad and no power watched data on mentor found timing adv all over the place pulled front cover found tensioner in pieces and timing two teeth off re...	December 14, 2007
	2003 Honda Pilot EX 3.5L MIL Lamp on, Continuous lean VIN: 2HKYF18523 P0171: Fuel System Too Lean (Bank 1). ... have seen this before). I have a P0171 bank one lean. after replacing evap and FP regulator I still have a continuous lean problem. Freeze Frame: Calc LD 29.4%, ECT 71 C, ST %18.7, LT%18.7, MAP KPA30, RPM 1008, MPH 29, IAT 10 C, ABSOLUTE TP % 9.4. GENERIC ...	December 14, 2007
	2001 Mercury Sable LS Premium 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1MEFM55S41 P0171: lean bank one. hello-trying to figure out this sable-it runs rough-compression on all cylinders are at 155 or higher -check engine lite is flashing-we have installed wires and plugs-but my main question is do these intake manifolds or plenum assy have problems leaking to cre...	December 15, 2007
	2002 Ford F-150 XL 5.4L Hesitation VIN: 2FDPF17M42 P0171: lean. Hi techs This is a 5.4 CNG ford pick up with a real bad miss under load at this time I have no codes . have checked for vac. leaks none found could injectors be a problem??? Thanks For Your Help	December 18, 2007
	2001 Toyota Corolla CE 1.8L Surge VIN: 1NXBR12E51 P0171: Fuel System Too Lean (Bank 1). ... shop were the check engine lite comes on while driving with the p0171-code-when driving away from a dead stop the vehicle noses over and hesitates-if you hit the throttle hard you can hear it back firing through the intake system-any suggestions.-thanks br...	December 24, 2007
	2003 Chevrolet Suburban 1500 LT 5.3L MIL Lamp on, Lean Condition VIN: 1GNFK16Z63 P0171: Fuel Trim System Lean (Bank 1). After replacing uel pump and filter, vehicle came back with same codes. LTFT is 11% bank1 and LTFT is 13% bank2. Checked for vacuum and is good (18hg") Truck has no misfire. No TSB's and Did the whole troubleshooting tree according to Mitchell. Everything ...	December 27, 2007
	2003 GMC Yukon Denali 6.0L MIL Lamp on VIN: N/A P0171: Fuel Trim System Lean (Bank 1). ... cust. said the MIL lamp come on and then goes off when they drove it on the highway. Last time it come into the shop the MIL lamp was on and the code was reading P0171. I have checked for evac leaks leading to the intake.	December 27, 2007
	2003 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 2GCEK19T83 P0171: Fuel Trim System Lean (Bank 1). check for spark ok . check for external vaccum leaks, long fuel trim 50% bank one . 25% short fuel trim , ran pid data bank 2 within perimeters. have random misfire po300 perimeter count flags 1,3,5,7 .	December 28, 2007