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? asked in Cars & TransportationCar MakesPontiac · 2 years ago

06 Pontiac Grand Prix, P0306, P0422 codes. 75psi in Cylinder 6. The rest of the cylinders are 100psi. Can this be fixed?

5 Answers

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  • John Alden
    Lv 7
    2 years ago

    Anything can be fixed with enough money, so can this.

  • thebax2006
    Lv 7
    2 years ago

    Sure get a valve job.

  • Bill
    Lv 6
    2 years ago

    yep -- get a new engine

    all compressions should be 155-165psi with a min pressure of 145 psi

  • Anonymous
    2 years ago

    Hopefully it's a poor seal in the valves. Unfortunately finding out is an expensive job. I would trade it in.

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  • Starrysky
    Lv 7
    2 years ago

    How much money do you have to fix a 13 to 14 year old Pontiac? It is no Mercedes, after all.

    Source(s): I enjoyed my mom's 62 Pontiac Catalina with the 389 V8. It was fast! But then in 1966 one of the pistons got too hot. Something about one old spark plug being under the air conditioner compressor, too hard to change. So that damaged that cylinder's compression. Funny how things never seem to change.
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