PO171 AND PO174 FOR 4.3L HELP

1998 GMC Jimmy

Tiny

roycar71

September, 30, 2012 AT 4:29 AM

LOL, I will do first thing in morning thanks.

Tiny

saturntech9

September, 30, 2012 AT 4:36 AM

Your welcome the rum flavored ones are my favorites use a really bright flash light to look for the smoke.

Tiny

roycar71

October, 13, 2012 AT 10:21 PM

I did smoke test with cigar. I did find that upper air duct that goes over throttle seemed to have comprised seal/gasket so I replaced it. Car drives good not one hesitation or stumbled, but still get po171 and po174 off and on; with rough idle when CEL comes on. My question, could it be a bad fuel injector. Thanks.

Tiny

saturntech9

October, 14, 2012 AT 1:48 AM

I have seen when you replace the mass air flow sensors on those with after market ones still having those lean codes. You could have a vacuum leak somewhere else also.

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