My 2004 Pontiac grand prix has a steady clanking noise from the engine and gets worse with acceleration. Any ideas what it might be?

Asked by Feb 24, 2014 at 12:33 PM about the 2004 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

7 Answers

Loud? Thrown piston rod, broken valve stem or such,.....not so loud? Valve tappets, something on serpentine belt pulley, there is a LOT of guesswork here

1 of 1 people found this helpful.
4,965

Did it come on suddenly (cracked flywheel), or is it getting worse over time ? (rod bearing).

Happen suddenly. I was going 75 thru I95 from jackson mi to BC mi and back and it just happen

Well both my bosses just saw my car and claimed its a piston rod and motor. Idk

4,965

Piston rod bearing is a reasonable guess. There is virtually no test to confirm this without tearing down the engine. If the engine is running okay other than the noise, its worth fixing.

4,655

While I generally agree with Norm's advice I'd disagree on this one. It's 10 years old and not worth much. There's a ton of hours involved in a job like that plus the parts. I'd start looking for another car.

4,965

Thanks Munron, yes it is a lot of work. The 3.1 engine was very popular and is available all over the place. You can get a running engine for as little as $300. But the total labor to replace a rod bearing might not be worth it. Before trashing the car, I would pull both valve covers and make sure it isn't something easily fixable,such as no oil pressure, a stuck valve, bent pushrod or collapsed lifter. Just because 3 people say it "sounds like a bad rod" doesn't mean that's the problem. Dig a little. Good luck!

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,455 nationwide Grand Prix listings starting at $1,900.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,580
  • #2
    Tom Demyan
    Reputation
    3,170
  • #3
    munron
    Reputation
    2,600
View All

Related Models For Sale

Used Chevrolet Impala
502 Great Deals out of 32,213 listings starting at $1,000
Used Pontiac Bonneville
4 Great Deals out of 409 listings starting at $1,995
Used Pontiac G6
35 Great Deals out of 3,801 listings starting at $1,000
Used Pontiac GTO
394 listings starting at $6,950
Used Chevrolet Monte Carlo
8 Great Deals out of 1,181 listings starting at $1,125
Used Pontiac Grand Am
952 listings
Used Ford Mustang
344 Great Deals out of 42,033 listings starting at $1,488
Used Chevrolet Malibu
1,009 Great Deals out of 53,814 listings starting at $1,250
Used Jeep Grand Cherokee
888 Great Deals out of 71,568 listings starting at $900
Used Nissan Maxima
325 Great Deals out of 20,536 listings starting at $1,175

Used Cars For Sale

2005 Pontiac Grand Prix GTP For Sale
32 listings starting at $3,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.