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I posted earlier; 02 Burb, 32k. Has knock during accleration for quite some time. did not knock when new (Feb 2002). So from what I am reading,it is #1) CARBON BUILD UP. #2) POOR QUALITY CONTROL/POOR ENGINEERING BY GM. But I thought the knocking was due to unburnt fuel igniting after it leaves the cylinder. That is why it happens during acceleration. Can anyone carify?
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