PO171 "System Running Too Lean" - 2005 Vibe 1.8L 1ZZFE

[houseofbugs]

I just had my check engine light come on and autozone showed a PO171 code. I already saw these posts and am going to clean the MAF Sensor and I put in a tank of Tektron injector cleaner. If this doesn't work what else can it be?Thanks in advance.Sources:http://forums.genvibe.com/zerothread?id ... /u...1.pdf

[lovemyraffe]

How is your car acting? Is it running ok? I had this code when my MAF died. It could still be many different things.Start by cleaning the MAF and making sure all the vacuum hoses are connected.

[keithvibe]

are you running a cai?

[BadBrew]

Quote, originally posted by keithvibe »are you running a cai?I had 3 P0171 codes last summer with my CAI, none since I plugged back the stock air box 3 months ago for winter.I reset the code with my SCII and kept going.If it happens too often, check for leaks around the silicone links or at the filter.You could also reset the whole thing by unplugging the battery for half an hour or so and start the engine on idle for 15 minutes so the computer adapts itself. Exept some rough idling where the computer adapts and drive slowly until everything is back to normal.Quote, originally posted by http://www.aa1car.com/library/ford_lean_codes.htm »WHAT A LEAN CODE MEANSA lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.So basically the CAI is doing it's job it's just the engine not expecting so much breathable air.

[houseofbugs]

I do have a CAI. I checked that it was all sealed up to the throttle body. I cleaned the MAF and am on my second tank of gas with TECTRON fuel injector cleaner. I have my buddy wipe my codes and it hasn't turned back on. I did notice this earlier:I will post a pic when I find it.

[houseofbugs]

Hello again... So on my trip the code came back. I wipe the code and it doesn't come back for another few months. I checked for vacuum leaks, CAI joints, and even cleaned the fuel injectors. The only other thing I can think of is the intake manifold gasket but I have no idea how to check it. Any ideas? Thanks

[lovemyraffe]

I've heard on here somewhere that a CAI can cause a CEL.

[rated_w]

Hi.. I have the same code with a friends 2002 Toyota Corolla.490 000 KMP0171 code.This is the info I got from it.DTC for which Freeze Frame was Stored P0171Fuel System 1 Status Closed LoopFuel System 2 Status Not SupportedCalculated LOAD Value 14.51 %Engine Coolant Temp 203.00 °FShort Term Fuel Trim - Bank 1 17.19 %Long Term Fuel Trim - Bank 1 21.09 %Engine RPM 707.75 rpmVehicle Speed Sensor 0.00 mphIntake Air Temperature 32.00 °FMIL ONMisfire Monitor CompleteFuel System Monitor CompleteCCM Monitor CompleteCatalyst Monitor CompleteHeated Catalyst Monitor Not SupportedEVAP Monitor CompleteSecondary Air System Monitor Not SupportedO2 Sensor Monitor CompleteO2 Sensor Heater Monitor CompleteEGR Monitor Not SupportedNMHC Monitor Not SupportedNox Adsorber Monitor Not SupportedBoost Pressure System Monitor Not SupportedExhaust Gas Sensor Monitor Not SupportedPM Filter Monitor Not SupportedNow I know it could be the MAF... But it could also be the o2 Sensor.... If anyone could bring some light to this issue, it would be great!

[houseofbugs]

So on my way back from the meet my engine light lit up again. I thought it was my voltage stabilizer but Im not sure at this point. I am going to see what code it threw. If it's the same I am going to check the intake manifold gasket for leaks.

[houseofbugs]

It's the intake manifold gasket. Time to go pick one up ~Tim