Intake Manifold Gasket May Leak Coolant or Engine Oil on Pontiac Grand Prix GTP

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. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.

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Average mileage: 139,557 (40,000–270,286)
9 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005
53 people reported this problem
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Viewing 1 - 20 of 30 problem details
2000 Pontiac Grand Prix GTP 130,000 mi,
2000 Pontiac Grand Prix GTP 97,452 mi,
oil in coolant but no coolant leaking into the oil
These engines generally do not blow the head gaskets. White smoke came out. I thought it was a blown head gasket, but the car only has 62,000 miles on it. It was the plastic lower intake manifold gasket. This one is the supercharged model. Get the metal gasket, do use the plastic ones as you will have the same problem later. Merle Gebers
I have power steering fluid leakage since I bought the car but the problem is worse in the summertime. Now I have leaks in the oil gasket, and the man at the garage told me that it will probably get worse. Today I had brown smoke start pouring out from beneath my hood and thought there was a fire. It finally stopped and I am not sure what to do now. Don't know if I should even drive the car to a garage.
2004 Pontiac Grand Prix GTP 83,000 mi,
engine leaking coolant and oil from intake manifold, car slightly runs hot in traffic and idling. changed thermostat, changed radiator cap,bled air out of cooling system,going to replace intake upper and bottom gaskets,this should stop leak, hope it solves heating issue.
2004 Pontiac Grand Prix GTP 80,000 mi,
Losing coolant and oil, problems starting and a rough idle.
2004 Pontiac Grand Prix GTP 147,000 mi,
Constantly having to add coolant, also had white smoke under hood. Found external oil and coolant leak. Cost of repair $1300
2004 Pontiac Grand Prix GTP 174,375 mi,
oil and coolant leak replaced intake manigold gasket
Alot of smoke out of tailpipes
2004 Pontiac Grand Prix GTP 47,000 mi,
oil and coolant leaks, external,
Have oil leak dont know where it comes from. Air conditioner dont really work.if it does only on drivers side. Transmission is messed up the gear shift to. Something also about my brakes i dont trust over heats. I dont have the money to fix all this. I walk everywhere or have to find rides
2004 Pontiac Grand Prix GTP 132,000 mi,
I had my hose gaskets blow out and replaced them with metal instead of plastic had no problems since great car
2004 Pontiac Grand Prix GTP 125,000 mi,
Leaking coolant.. On garage floor and on manifold..white smoke out of exhaust..knocking sound on top of car in tomorrow
2005 Pontiac Grand Prix GTP 270,286 mi,
Shaking and split ring white exhaust smoke when cranked up and stalling
reading coolant temp sensor high voltage ive replaced sensor and wire harness and still reading the same same code.
2002 Pontiac Grand Prix GTP 150,000 mi,
Coolant in oil
2000 Pontiac Grand Prix GTP 230,000 mi,
Lower intake manifold gasket leaked and was repaired
1997 Pontiac Grand Prix GTP 252,000 mi,
Rough idle smoke and multiple symptoms of bead gasket leak. Intake gasket was leaking and fine for about a month before it began causing serious problems. Swapped an entire intake over from a parts car using new gaskets.
2004 Pontiac Grand Prix GTP 108,000 mi,
leaking from intake gasket manifold, water pump, etc
1998 Pontiac Grand Prix GTP 185,000 mi,
low coolant light came on, had to replace the intake manifold gasket and some plastic elbow broke. now i see my coolant reservoir caked with oil.