I have a 2002 pontiac gran prix gtp supercharged an have had high idol an car would shut off when slowin down.i have replaced idol control sensor,mass air flow,coolent sensor an now have sputter badly

20

Asked by Nov 19, 2013 at 05:43 PM about the 2002 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

9 Answers

254,585

Look for a vacuum leak, and clean throttle body.

20

I have found no vacuum leaks an its fuel injected so no throttle body.ive been all threw all an cant seem to find the problem..need help....

70,325

Have you had the upper and lower intakes done. If not, as Tom said, you've probably got a vacuum leak from a failing intake gasket. These 3.8s are notorious for that. Look for white milky "goop" on the oil dipstick as well. A sure sign the gasket is failing. HTH. -Jim

20

No vacuum leaks its been checked an no milky goop on the oil stick.i was told maybe it is the egr valve? But i took the egr off an cleaned it like i was told but it didnt help any.

1 of 1 people found this helpful.
70,325

Is your service engine soon light on? If so have the computer scanned and post the trouble code(s) here. Advance and Autozone auto parts stores will do it for free. I doubt it's the EGR valve. With a faulty EGR valve it will either idle very poorly or won't stay running (valve stuck open). HTH. -Jim

20

My light is unhooked or something it has never came on at all an i took it to advance auto an they scanned it an its showing now the problem is the fuel injector 3 bad an is still showing all the new sensors i put on the car are bad..i just dont understand..sorry im a woman an tryin to do this alone an im not mechanically inclined..thank you for helping me

1 of 1 people found this helpful.
70,325

Oh my, that doesn't sound good. Honestly I think it's time to let a shop take a look at it. Sounds like some serious computer stuff going on here. -Jim

385

I would have said injectors... Sounds like it needs some serious TLC... How long have you owned the car? Are you looking to keep it?

30

check the fuel pressure regulator. That is exactly what mine did. look for raw fuel sucking into the throttle body through the vacuum line coming from it.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,738 nationwide Grand Prix listings starting at $1,491.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,390
  • #2
    Tom Demyan
    Reputation
    2,990
  • #3
    munron
    Reputation
    2,400
View All

Related Models For Sale

Used Chevrolet Impala
515 Great Deals out of 34,208 listings starting at $950
Used Pontiac Bonneville
3 Great Deals out of 526 listings starting at $1,799
Used Chevrolet Monte Carlo
11 Great Deals out of 1,302 listings starting at $2,500
Used Pontiac Grand Am
1,067 listings starting at $1,899
Used Ford Mustang
726 Great Deals out of 38,098 listings starting at $895
Used Chevrolet Camaro
415 Great Deals out of 30,917 listings starting at $3,550
Used Chevrolet Malibu
1,086 Great Deals out of 71,438 listings starting at $2,499
Used Pontiac Firebird
15 Great Deals out of 781 listings starting at $2,999
Used Honda Accord
1,117 Great Deals out of 62,344 listings starting at $1,199

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.