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

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

Pontiac Grand Prix Problem

44 Reports

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

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

Average Mileage: 120,471 mi (60,000 mi - 263,000 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.

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p_fultz, 1998 Pontiac Grand Prix, 3.8L V6, 113,023 mi

Rookie
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, 2003 Pontiac Grand Prix, 99,500 mi

Oil found mixed into coolant resivour

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Visitor, 2006 Pontiac Grand Prix, 120,231 mi

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

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hotrodgirl, 2000 Pontiac Grand Prix, 3.8L V6, 263,000 mi

Rookie
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, 2002 Pontiac Grand Prix, 3.8L V6, 95,000 mi

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

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Visitor, 1998 Pontiac Grand Prix, 3.1L V6, 120,000 mi

Leak from intake under the thermostat housing

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Visitor, 2006 Pontiac Grand Prix, 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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jaymoney, 2003 Pontiac Grand Prix, 3.8L V6, 185,000 mi

Rookie
Seems I have a leak of coolant into the engine oil. Recommended repairs were Valve cover gasket @ 149.19 for parts and 312.00 for labor (total $461.19) Also Oil pan gasket set @ 119.82 for parts and 436.80 for labor (total $556.62) Also Intake Manifold Gasket @ 153.37 for parts and 436.80 for labor (total $590.17). I would like to do all this repair on my own if possible. total shop cost is $1683.58. Id like to save that money, any recommendations welcomed.

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Visitor, 2002 Pontiac Grand Prix, 3.1L V6, 80,000 mi

The car is still running well in spite of this issue, but for how long I don't know. The a/c continues to work well but I'm still getting rid of this car because in addition to this issue, it's got a host of other issues I'm not willing to fix.

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Visitor, 2002 Pontiac Grand Prix, 3.1L V6, 100,000 mi

I had to constantly keep adding coolant. These leaks are hard to see. It's freaky - you see lots of coolant on the ground but it takes a lot to see where it's coming from. I had to have the upper and lower intake gaskets replaced and it was pricey. About $900.

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Visitor, 2002 Pontiac Grand Prix, 3.1L V6, 100,000 mi

I had to constantly keep adding coolant. These leaks are hard to see. It's freaky - you see lots of coolant on the ground but it takes a lot to see where it's coming from. I had to have the upper and lower intake gaskets replaced and it was pricey. About $900.

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Visitor, 1998 Pontiac Grand Prix, 3.8L V6, 117,000 mi

Intake fractured and is leaking coolant externally, daughter has been driving the car for over a year that way, just adding coolant as needed, now problem is getting worse at 137K and I'll be spending next weekend fixing the dang thing. 15 years and 137K miles and it finally broke down, sorry guys, thats just the price of owning a car. I ain't complaining at all...

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Visitor, 2001 Pontiac Grand Prix, 3.8L V6, 84,000 mi

Car overheated. Took to shop where they told me it was the intake manifold gasket leak. No solution yet. Wanted $1650. Shopping around.

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Visitor, 1996 Pontiac Grand Prix, 143,000 mi

intakemanifold gaskets leak

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Visitor, 2002 Pontiac Grand Prix, 3.8L V6, 110,000 mi

Replaced gasket, not sure if it is releated but now my car is stalling and the check engine light came on

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Visitor, 1995 Pontiac Grand Prix, 3.1L V6, 127,000 mi

lower intake coolant/oil mixed

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justo, 2000 Pontiac Grand Prix, 3.1L V6, 70,000 mi

Rookie
coolant in the engine

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Visitor, 1998 Pontiac Grand Prix, 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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srsturm, 1997 Pontiac Grand Prix, 3.8L V6, 102,000 mi

Rookie
Replaced the gasket

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Visitor, 2000 Pontiac Grand Prix, 3.1L V6, 99,000 mi

coolant leaks and bubbles out of lower intake gasket on the drivers side next to the head at the firewall

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