2006 Pontiac Grand Prix Knocking

2006 PONTIAC GRAND PRIX
77,000 MILES • 6 CYL • FWD • AUTOMATIC
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KING_1985
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I have a 2006 pontiac grand prix. 80k or less miles on it. My car use to knock real loud when I was idle or breaking and stop/slow down when I accelerated. Now it has slowed down almost too where it doesn’t knock. I have been told it could be one of three things, rod about to bust, filter dirty, and/or loose part under hood. From my description, can you help me identify what it may be?
Aug 5, 2010 at 3:11 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Rod knock does not get better, only worse.

Possibilities are a bad bearing in belt tensioner, or possible loose flywheel/flexplate.
Aug 6, 2010 at 7:48 AM
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