Question about 1998 Pontiac Bonneville

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Sticking lifters.........98 bonneville

I have a 1998 bonneville,i think one of the lifters is sticking in the motor,i have tried different products to free it up but the motor still knocks (more when cold) i am trying to not take the motor apart

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  • toneman2121
    toneman2121 May 11, 2010

    is the sound from the top of the engine or more towards the bottom. a knocking sound indicates a rod bearing, a tapping sound indicates a valve train problem.

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Are you mysteriously losing coolant? If not, then that's good news. I had one that was losing coolant but had no leaks. Turns out the plenum was cracked where the EGR gasses go through (too much heat for that plastic) and was leaking dextron antifreeze into the engine. Common problem with these. Took out all my lifters, clicked like crazy. Also, the intake gaskets go bad. Also, the plenum can crack under low battery condition when fuel explodes in the intake, there's a recall for this.

Posted on May 30, 2017

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Either the rocker arms need to be adjusted or you have a flat cam lobe.

Posted on Apr 11, 2010

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