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2002 Pontiac Grand Prix 2002 Pontiac Grand Prix Supercharge

Tiny
SLUGGER6606
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 118,500 MILES
I had a arelly bad knocking noise a few ppl told me that it was the lifters so I replaced all of them and all the gaskets and thermostat. Flushed the system put everthing back to together started same thing nothing changed. It sounds it might be coming from the supercharger but I have no clue. Could it be the cam shaft or crankshaft?
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Saturday, June 6th, 2009 AT 7:43 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
If it knocks at idle and gets louder with RPM, it is most likely a main bearing/rod bearing.

On cold engine, remove serpentine belt and run engine for 30 seconds, if knock is there then it is internal engine, if no knock, then it may be supercharger.

Blowers don't normally knock, they whine and it gets louder if bearing is bad, but anything is possible.
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Monday, June 8th, 2009 AT 7:41 AM

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