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  1. npfd

    three knocks heard at idle after sitting overnight

    Hi all, The car is a 2007 Grand Prix, with the 3800 N/A. We bought it second hand in 2011 with about 57k kms, now it has about 102k kms. I used to hear this a while ago, I think even the first winter when we had the car. Let the car sit overnight, and start it and drive several minutes and...
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