Tune up with OEM parts?

Answered by 2CarPros Jack (expert)
12,033 answers provided

Does it smell like it is running rich?
Are you using a K&N air filter? An oiled filter can play hell with a MAF even when it is new.
Did you replace both the upstream O2 and the one after the cat? Any exhaust leaks?
Check for vacuum leaks @ the hoses and Map.
What fuel pressure did you get with the engine off? Does the pressure bleed down?
Does the pressure fluctuate with the engine running?

I'd bet on a fluctuating pressure regulator or a leaking injector. Try some injector cleaner or have them professionally cleaned. I like chevron with techron.

Good luck and let us know. :)

Answered by peppermrj
19 questions asked

From: wj2893
To: peppermrj
Posted: Sun Mar 18, 2007 2:08 pm
Subject: p0172
"Thanks for the input regarding my problem on this code.I found that there was a pinched return fuel line and the problem is now fixed. thank you again,Bill "

Thanxs for the update. :)

Answered by peppermrj
19 questions asked