Update

Cleaned the MAF, replaced the air filter while I was in there. Figured I would try the least expensive route first. Didn't fix it, though I did see a small bump in mpg.

Checked the fuel pressure. About 30psi when running, and as soon as I turn the car off, pressure drops to zero. No bleed off, its like turning a switch off, which, I guess I did.

So, will now be shopping someone to replace the pump since I am not comfortable dropping the tank and dont really have a place to do that kind of work anyway.

Thanks for the help y'all. Stupid fuel pumps.

 

Hmmm,A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if thei filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor
I'd inspect all vacuum and PCV hoses, replace/repair as required Inspect all hoses and connections in the air intake system Inspect and/or test the intake manifold gaskets for leakage Check for a dirty fuel filter and proper fuel pressure Ideally you'll want to monitor short and long term fuel trims using an advanced scan tool If you have access, you may want to run a smoke test
So it could be the fuel pressure causing the code , could be fuel injector o rings, it could be the fuel pump assembly

 

If you have a fuel pressure of 30 lbs while running that is your problem. I think the pressure should be around 58 lbs. I have the same problem with my street rod setting code P0171 and discovered the long term fuel trim was maxed out at 25% while the short term fuel trim was reading only about -2 to +2. In my case I have an off shore in tank knock-off pump which I believe is not living up to specs. I own three vehicles now, all of which have OBDII. To troubleshoot I purchased a code reader/scanner which will read codes, display real time data and of course clear codes. The unit I got (Ultragauge) will display up to 85 different data inputs. Cost online was about $70. Anything newer that about '97 will have OBDII so something like this is a very useful tool.

 

Low fuel pressure would certainly cause it.

 

Thanks, Lucky.


I'm glad I could piggyback on someone else's thread to get help with my problem.