How do you correct the engine issues I'm having with a 2002 Pontiac Grand Prix GT 2dr 3.8L?

415

Asked by Robert Sep 23, 2012 at 05:09 PM about the 2002 Pontiac Grand Prix GT Coupe

Question type: Maintenance & Repair

Between 0-25mph it doesn't want to stay running, between 40-60mph especially going uphill the rpms bounce between 2000-3000rpms, what would be causing this?  I've been told spark plugs, egr valve or catalytic convertible...any ideas?

1 Answer

69,815

Catalytic converter is a no all around. As for the going up hill it sounds like gear hunting and its mostly something that happens in a pickup that's towing something. Its a case where the speed that you're going is putting enough of a load on your engine that the computer tells the trans to downshift to lighten the load and put more power to the wheels. After down shifting the computer sees little or no load on the engine and there isn't a request from the driver to accelerate so it shifts back up to save fuel. The process starts all over again. Try putting the gear selectorin a different gear like drive instead of over drive. The EGr won't affect the acceleration without affecting the idle. The need for a tune up could cause both issues but no guarantee.

Your Answer:

CarGurus Experts

  • #1
    munron
    Reputation
    8,220
  • #2
    James Sparrow
    Reputation
    7,520
  • #3
    Dorian Hendricks
    Reputation
    6,170
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Corvette
29 Great Deals out of 1,060 listings starting at $15,871
Used Pontiac Firebird
15 listings
Used Ford Mustang
65 Great Deals out of 1,259 listings starting at $4,995
Used Chevrolet Impala
9 Great Deals out of 107 listings starting at $4,632
Used Chevrolet Camaro
16 Great Deals out of 307 listings starting at $10,500
Used Chevrolet Monte Carlo
7 listings starting at $3,000
Used Chevrolet Tahoe
24 Great Deals out of 911 listings starting at $11,900

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. Content will be removed if CarGurus becomes aware that it violates our policies.