Knocking sound out of nowhere

2000 PONTIAC GRAND PRIX
199,000 MILES
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WHITëBøI XâPøNë
  • MEMBER
  • 1 POST
Car quit running all of a sudden. It was not running hot had oil, but heard bubbling noise waited a few hours started up making a knocking sound from top of engine.
Apr 17, 2017 at 5:57 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
noises are hard for us to diagnose on here. pull a valve cover and see if you can see a broken or loosened rocker arm or broken spring something on that order if spring is broken valve may have dropped and hitting piston.
Apr 17, 2017 at 11:19 PM
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