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It could be the harmonic balancer. This is the first pulley on the engine drive shaft that drives all the other pulleys with the serpentine belt. It is quite easy to look at it and see if the rubber has deteriorated. I had this problem with my '92 PA.

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Q: What would make a 97 park ave make a knocking noise when you start it?
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== == I do believe if you hear a knocking noise that your crank shaft could be failing. Which means you will need a new engine. Have it checked out. Replace the harmonic balancer they will make a bad knocking noise. When you start it and the oil light goes out and it knocks, this is what is wrong with it.


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