Possibble o2 senor problems or not?

PONTIAC GRAND PRIX
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RIXTER
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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.
Apr 6, 2006 at 9:53 AM
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PEPPERMRJ
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What is the exact code?
Apr 6, 2006 at 1:33 PM
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RIXTER
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I have to ask again but I thnk it was 44 or 45
Apr 7, 2006 at 12:24 AM
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PEPPERMRJ
  • ✓Experienced 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. :)
Apr 7, 2006 at 12:00 PM
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