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P0171 Diagnostic Trouble Code Discussion for March 2004

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	1997 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTDF176XV P0171: lean bank one. To borrow a line from a Jerry Reed song ( I think it was Jerry Reed) "Lord, Mr. Ford". Came in from another shop with these codes, cust had the truck smog tested with the MIL on. Failed due to the codes (no kidding). The other shop had replaced the 02 ...	March 01, 2004
	1998 Toyota Camry CE 2.2L Poor Fuel Economy, MIL Lamp on VIN: 4T1BG22K9W P0171: Fuel System Too Lean (Bank 1). ... other complaint.we scanned vehicle for codes p0171 in history. scan data, sensor not responsive to false air or added propane. replaced a/f sensor,sensor data slow to move? voltage sits around .650 seldom changes.vehicle runs good.	March 01, 2004
	1999 Ford Escort ZX2 Hot Coupe 2.0L MIL Lamp on, Lean condition/idle VIN: 3FAKP1137X P0171: system too lean bank 1. ... was illuminated. retrieved dtc p0171 no drivability problems present, data stream shows ltft @ +25% and stft @+2%. checked fuel pressure found that it was 5 psi below specs at idle. bypassed fuel pump control module by grounding pump ground, pressure would...	March 02, 2004
	1999 Toyota Tacoma DLX 3.4L MIL Lamp on VIN: JHTA493X7N P0171: Fuel System Too Lean (Bank 1). this tacoma is having a problem with po171 lean bank one code. it idles good, but on snap throttle test for o2s it will ping. it also pings under load. the code sets when long term fuel trim goes 25+ or_- of 0. while driving under moderate load i've seen +34! ...	March 02, 2004
	2000 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR12E4X P0171: Fuel System Too Lean (Bank 1). any idea how to correct this problem ?	March 02, 2004
	2001 Ford Explorer Sport 4.0L Poor Idle Quality, Surge, Stall, COLD ONLY. BELOW 70 VIN: 1FMYU60E11 P0171: system too lean. Hi guys, This ones a stumper. Replaced timing chain and cam tensioners for cold rattle. Set cam timing with otc tool kit. Ran fine till temp droped below 70 deg. (Florida Keys, avg temp 78 deg) Now we get a rough idle, surge, occasionally stalls for 1st 15 s...	March 03, 2004
	1999 Toyota Tacoma DLX 3.4L MIL Lamp on VIN: JHTA493X7N P0171: Fuel System Too Lean (Bank 1). this tacoma is having a problem with po171 lean bank one code. it idles good, but on snap throttle test for o2s it will ping. it also pings under load. the code sets when long term fuel trim goes 25+ or_- of 0. while driving under moderate load i've seen +34! ...	March 03, 2004
	2000 Nissan Maxima GLE 3.0L MIL Lamp on VIN: JN1CA31D2Y P0171: Fuel Trim Lean (Bank 1). Hi This engine is running lean, has normal fuel pressure. Thought we located an intake leak with propane so we replaced upper and lower intake gaskets. this did not solve the problem. We cannot find anymore leaks, yet it continues to run lean and it pings. the...	March 04, 2004
	1999 Dodge Caravan 3.0L erroneous data VIN: 2B4FP2530X P0171: Fuel System Lean (Bank 1). ... scanned for codes & found p0171 & p0132.Also observed toggling readings on the following : closed loop enable time 12/192 ,misfire counters 15/240, desired idle 482/7710 rpm, iac 15/240 counts, pulse witdh 15.42/ 24...	March 05, 2004
	1997 Ford Windstar GL 3.8L MIL Lamp on VIN: 2FMDA5144V P0171: lean bank 1. Service light on with two codes, long term fuel trim pegged and 25% no real big drivability problems but these codes will not clear could the customer installed wrong injectors are there any pattern hard to find vacuum leaks that we could be missing. The compu...	March 10, 2004
	1999 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GCEK14V1X P0171: Fuel Trim System Lean (Bank 1). ... reading my post. I have inherited this from some one else in the shop. It originally came in for a check engine light and poor run. Our other tech pulled codes and found P0171 and P0174 system lean for both sides. He found the fuel pressure regulator leaki...	March 11, 2004
	1998 Ford Windstar GL 3.8L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 2FMZA5147W P0171: lean bank 1. Customer complaint: CEL-ON engine dies at idle, Engine miss. Compression good intake vacuum leaks none found. Cam position sensor found to be literary destroyed Replaced cam sensor virtually no improvement (DUH WHAT)? Replaced upper & lower Intake mani...	March 13, 2004
	1998 Buick Regal 25th Anniversary Edition 3.8L MIL Lamp on VIN: 2G4WF5210W P0171: Fuel System Lean. This buick runs great...check lite on..P0171. bank 1 sensor 1= lean I changed fuel filter, air filter, and cleaned the injectors. Tested fuel psi. ok Lite came on 1000 miles again. Same code. LT and ST fuel look out of wac. The freeze frame set at idle while w...	March 15, 2004
	1998 Ford Windstar GL 3.8L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 2FMZA5147W P0171: lean bank 1. Customer complaint: CEL-ON engine dies at idle, Engine miss. Compression good intake vacuum leaks none found. Cam position sensor found to be literary destroyed Replaced cam sensor virtually no improvement (DUH WHAT)? Replaced upper & lower Intake mani...	March 15, 2004
	1999 Ford F-150 4.2L MIL Lamp on VIN: 1FTZX172OX P0171: Lean bank 1. Hi guys' I have this 99 f150 that seems to be running lean only for the cust.. It has been in twice for 171 & 174 codes for lean condition. I have cleaned the MAF and checked all the basics. When I drive it, all seems good,but when the cust gets it back, t...	March 17, 2004
	1996 Lexus LS400 4.0L MIL Lamp on VIN: JT8BH22F8T P0171: Fuel System Too Lean (Bank 1). This lexus has a po171 code that comes back after a couple days.[...] have been changed and MAF has been changed.Fuel pressure is 40 psi at idle and 44 psi when regulator vac. is unplugged [...] readings are good and no vac. leaks are found. ST fuel trim readi...	March 24, 2004
	1996 Chevrolet Cavalier LS 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1G1JF5245T P0171: Fuel System Lean (Bank 1). Car came in with a broken rod. The customer declined a rebuilt and requested a used engine. We obtained one from a 96 Cavalier (VIN# [...]) with 80,000 miles. When the car was started for thr first time it idled very rough with black smoke out the tailpipe. We...	March 25, 2004
	1996 Mercury Mystique GS 2.0L MIL Lamp on VIN: 1MELM6538T P0171: Lean exhaust bank 1. Car came in with P0171 code, replaced both O2 sensors, test drove okay. Lite came back on again after a few days, same code. Found small vacuum leak and repaired, test drove again, okay. Vehicle is in for the third time, same code. Fuel pressure okay, all inje...	March 26, 2004
	1999 Ford Windstar LX 3.8L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 2FMZA5142X P0171: Lean bank 1. the van has a miss or cuts out(slight) when driving down the road.I have found that the problem seems to be rpm related and the speed of the van does not matter.The surge or miss will happen between 1500rpm and 2000rpm,whether i drive 30mph or 55mph in overdri...	March 27, 2004
	1999 Ford Windstar LX 3.8L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 2FMZA5142X P0171: Lean bank 1. the van has a miss or cuts out(slight) when driving down the road.I have found that the problem seems to be rpm related and the speed of the van does not matter.The surge or miss will happen between 1500rpm and 2000rpm,whether i drive 30mph or 55mph in overdri...	March 29, 2004
	1996 Jeep Grand Cherokee Limited 4.0L jerks bucks shuts of VIN: 1J4EZ78S7T P0171: Fuel System Lean (Bank 1). ... Nov of last year. It will intermittantly buck or jerk. Sometimes it will shut off while driving. Sometimes as you come to a stop. Customer thinks fuel problem and originally gave me a fuel filter to replace. A couple weeks later,he gave me a cap and wires ...	March 31, 2004