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1998 Pontiac Grand Prix 1998 Pontiac Grand Prix engine nois

Tiny
MDRAGER
  • MEMBER
  • 1998 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 108,000 MILES
My grand prix has a knocking sound coming from the engine and I can not figure out what it is. Any suggestions of what it may be? And how much it may cost to fix it?
Saturday, August 7th, 2010 AT 11:53 AM

5 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Does knocking increase with engine speed?
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Sunday, August 8th, 2010 AT 8:28 AM
Tiny
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Yes it does.
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Sunday, August 8th, 2010 AT 10:36 AM
Tiny
MMPRINCE4000
  • MECHANIC
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Generally a knock that increases with engine speed is a bearing (main/rod).

Change oil and drain into container, use a magnet to search for metal particles, if present, then engine will have to be replaced or new bearings, possible crankshaft/camshaft/rods will need to be replaced.

If you find particles, it would be far cheaper to replace engine with used one from junkyard.
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Monday, August 9th, 2010 AT 7:40 AM
Tiny
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Thank you for the help.
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Monday, August 9th, 2010 AT 11:31 AM
Tiny
MMPRINCE4000
  • MECHANIC
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Good luck!
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Tuesday, August 10th, 2010 AT 8:19 AM

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