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.
Intake Manifold Gasket May Leak Coolant or Engine Oil on Pontiac Grand Prix
Average mileage: 130,761 (10,000–310,000)
Engines affected: 3.1L V6, 3.4L V6, 3.8L V6
100 people reported this problem
43 people shared problem details
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?
2003 Pontiac Grand Prix99,500Visitor
Oil found mixed into coolant resivour
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.
2006 Pontiac Grand Prix120,231Visitor
The coolant is leaking in to the engine,the intake manifold gasket is being replaced to correct.
1998 Pontiac Grand Prix- 3.1L V680,000Visitor
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.
2002 Pontiac Grand Prix- 3.8L V695,000Visitor
Ruined my cat, had both img's replaced. Common issue with this car.
2006 Pontiac Grand Prix- 3.8L V6141,000Visitor
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
2002 Pontiac Grand Prix- 3.4L V683,000Visitor
The one plactic elbow going into the manifold from the water pump is leaking 0
1997 Pontiac Grand Prix- 3.8L V6Visitor
My car has had a head gasket change, plenum cover 2, intake 2 and exhaust gaskets changed. Yet I am still pouring white smoke and smelling like coolant. I am getting really frustrated. What is wrong with these cars!!!!!!
1998 Pontiac Grand Prix- 3.1L V6120,000Visitor
Leak from intake under the thermostat housing
1998 Pontiac Grand Prix- 3.1L V610,000Visitor
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
1996 Pontiac Grand Prix- 3.4L V6200,000Visitor
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
1998 Pontiac Grand Prix- 3.8L V695,000Visitor
engine light on. Engine overheated on highway. Had to replace upper and lower intake manifold gasket becuase it was leaking. Was quoted just to change the lower for $900. Went ahead and did upper as well and got another quote getting both done at same time for $575. Get multiple bids!!
2002 Pontiac Grand Prix- 3.1L V6292,511Visitor
Oil leaking into coolant. I use Mobile 1 10W30 and a quart of lucas every oil change and the Lucas seems to slow the leak. Car hasn't overheated on me yet.
2001 Pontiac Grand Prix- 3.4L V6155,000Visitor
Water in oil
2001 Pontiac Grand Prix- 3.4L V6180,000Visitor
coolant in oil,overheating very rough idle white smoke blowing from tail pipes.
2006 Pontiac Grand Prix- 3.8L V6140,000Visitor
Leaking coolant from front of engine. Appears to be intake manifold. Not fixed yet. Leak is external only.
2005 Pontiac Grand Prix- 3.8L V6185,000Visitor
Replaced intake manifold gasket.
2002 Pontiac Grand Prix- 3.1L V665,000Visitor
Intake leaked oil and coolant both, had gaskets replaced.
2005 Pontiac Grand Prix- 3.8L V6310,000Visitor
im sure I have a blown head gasket a lot of white smoke from exhaust and car overheats get reduced engine power a lot have not fixed it
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