Possibble O2 senor problems or not?

RIXTER

MEMBER
PONTIAC GRAND PRIX

Replaced intake manafold gasket on 1989 pontiac grand prix v6 2.8 liter multi port. Now have driveability problems scan tool say o2 sensor not sure that it is? Computer is riching the fuel and stalling. Using a lot of gas.

Thursday, April 6th, 2006 AT 4:53 PM

3 Replies

PEPPERMRJ

MECHANIC
1,158 POSTS

What is the exact code?

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Thursday, April 6th, 2006 AT 8:33 PM

RIXTER

MEMBER
2 POSTS

I have to ask again but I thnk it was 44 or 45

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Friday, April 7th, 2006 AT 7:24 AM

PEPPERMRJ

MECHANIC
1,158 POSTS

44 is that O2 indicates a lean condition.
45 is rich.

If a lean condition has been detected the PCM will rchen the mixture. A lean condition is caused by unmeterd air getting into the combustion chamber.
Vacuum leaks (check hoses and around the intake and throttle body) and a dirty/bad MAF (mass air flow sensor) are prime suspects.

Also check the fuel pressure and run some injector cleaner thru a tank or two. I like chevron with techron.

Good luck and let us know. :)

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Friday, April 7th, 2006 AT 7:00 PM