2004 Pontiac Grand Prix Knocking in engine

Tiny
DBCROZZ86
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 96,000 MILES
Ive kept up with all the routine stuff. But when I first start the car its fine but about 5-10 minz into it warming up its a loud knocking sound. When I hit the gas and bring it to 2000 rpms the noise is gone. People I have talked to think it could be the valve on the piston but ive tried all the liquids you put in the oil to try to get them none sticky and put dry gas in but still nothing. I was just wondering if there was anything I can do or try because I dont want to have to take my whole engine apart.
Sunday, December 20th, 2009 AT 9:05 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Change oil and filter, run magnet through oil looking for metal particles in oil, if present then you have a bearing problem.

Another possibility is a loose flexplate, remove flexplate cober and check flexplate to convertor bolts.
Was this
answer
helpful?
Yes
No
-1
Monday, December 21st, 2009 AT 5:27 AM

Please login or register to post a reply.

Related Noise Knock Content

VIEW MORE