>New gaskets didn't fix it. Ran for about 1 day then P0171 showed back
>up. <insert choice of adjectives here> Anybody have any suggestions
>where to look next? O2 sensor? Bad injector(s)? I already checked all
>the vacuum lines while I had it apart and they were fine.
I have heard of a FEW people that ran some good fuel injector cleaner thru
the tank and got this code to clear. Try NAPA and see if you can find bg44k -
about 25.00 a can but it works well. Techron is also effective, but the
bg44k works better. Might as well do your fuel filter if you have not
chenged it recently.
Other UNusual stuff that causes p0171
1. Dipstick tube sucking air - bad seal
2. PCV hoses sucking air.
3. Cracked air intake tube between MAF and throttle body - pull it and check
it carefully for cracks.
4. EGR valve loose, or leaking.
5. Tube from exhaust manifold to EGR valve cracked, or loose
6. Hose from fuel vapor recirc system (evap solenoid) to intake manifold
cracked or leaking.
7. Loose throttle body bolts
8. Exhaust system leak before O2 sensors (since you are setting p0174 that
would require TWO leaks)
If you check all this stuff, do the cleaner and fuel filter, I think you have
good chance of finding your issue.
If you feel like it, post your LT and ST fuel trims at idle, 1500 rpm, and
2500 rpm., and whether you set the code at idle or while driving.
Message posted via CarKB.com