Car Problem Reports

Pontiac Grand Prix Intake Manifold Gaskets May Leak Coolant or Engine Oil

Pontiac Grand Prix Problem
82 Reports
Me Too

Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008

Engines Affected: 3.1L V6, 3.4L V6, 3.8L V6

Average Mileage: 122,491 mi (10,000 mi - 278,000 mi)


The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine  with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.

  • Visitor, , 99,500 mi

    Oil found mixed into coolant resivour

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  • p_fultz, , 3.8L V6, 113,023 mi

    Well, when i started my car i saw nothing but white smoke billowing from the tail pipe. Now car the rides extremely rough, i had it towed to a shop and they told me that i needed another engine, but after reading about how common this problem is i think i need a second opinion.

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  • Visitor, , 120,231 mi

    The coolant is leaking in to the engine,the intake manifold gasket is being replaced to correct.

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  • Visitor, , 3.8L V6, 95,000 mi

    Ruined my cat, had both img's replaced. Common issue with this car.

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  • Visitor, , 3.8L V6, 141,000 mi

    my son checked the oil and it was very low.we checked for leaks everywere.but none to be found.and it dont smoke. noticed milky color in oil cap and radiator cap.most likley head gasket.also has a small skip but thats most likly the water in the oil.also head lights want work on dim.But over all great car that will fly. r ROLL TIDE

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  • hotrodgirl, , 3.8L V6, 263,000 mi

    This has been an awesome car with regular maintenance and normal wear/tear replacement parts but after replacing the AC condenser, it will run hot (210 degrees) and the TEMP light will come on. Fans both run, radiator is full. Runs fine in the cooler months and in the hot months (100+ this year)without the AC on. Noticed some oil residue around the opening of the radiator but no water in the oil, no white exhaust. Otherwise still squalls the tires and hugs the corners great. Any suggestions?

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  • Visitor, , 3.1L V6, 80,000 mi

    very common problem with these vehicles. GM had a class action suit against them and i was not informed of the suit until it was too late. i should have been reimbursed for the cost of replacing the manifold gaskets but was never notified.

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  • Visitor, , 3.1L V6, 120,000 mi

    Leak from intake under the thermostat housing

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  • Visitor, , 3.1L V6, 10,000 mi

    Had this problem from the get go.
    Took it into the dealer for a ticking noise under the hood... they sent me out of the shop making me look like a damn fool that the noise is normal & anything worse is in my head (cuz I'm a girl?)
    Smoke coming out of tailpipe... no matter where I took it they made it sound like a big job to do & they can do it when they are less busy which they rarely are.
    So my dad (a smart guy but an asshole) said it is a simple & quick repair that he'll do when I change the oil next time... well that is not going to happen, I rather pay someone to fix it than to have him do it. Now I will go to the shop & tell them what to change & will update this post accordingly

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  • Visitor, , 3.4L V6, 200,000 mi

    car miss-fires up until you get it above 2000 rpm but doesnt miss fire if its been on for awhile replaced the head gaskets intake gaskets all of them it fixxed the problem right up

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