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.

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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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If you hear a tappet noise when the engine is started, and it goes away after a few seconds, if is not a very serious problem. What is happening is that you have Hydraulic lifters that maintain they're adjustment when the motor is not running. One of the lifters is collapsing. When you start the engine it pumps back up and works. Since lifters are at the top of the engine, you should that you use. It is called "Sea Foam". It is an excellent product to ad to the oil. It helps keep the engine cleaner and removes any moisture from the oil. It is great with hydraulic lifters.
Just so you know the difference. If you have a sticking lifter, you will have a constant tapping sound. I have used Sea Foam to un-stick lifters successfully.


It is recommend that the belt be changed at 60,000 miles.
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