Question about 1991 GMC Sonoma

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Loss of oil pressure

My 1977 350cid losses it oil pressure at idle when warmed up, if you just touch the throttle it returns to 30lbs.

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  • mayor mack Oct 18, 2008

    thanks, bearing were plastic gauged before install, all were in spec. My thinking has been bypass, missing a reducer in the line somewhere,

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  • Master
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Main bearings are worn and when heats up they expand even more and oil can blow out these with less pressure.

Posted on Oct 17, 2008

  • TripleTauto
    TripleTauto Oct 19, 2008

    so this is a rebuilt motor? could just be a weak spring in oil pump

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