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

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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Average mileage: 126,559 (10,000–310,000)
Engines affected: 3.1L V6, 3.4L V6, 3.8L V6
15 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
94 people reported this problem
40 people shared problem details
Oil found mixed into coolant resivour
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?
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.
The coolant is leaking in to the engine,the intake manifold gasket is being replaced to correct.
1998 Pontiac Grand Prix- 3.1L V680,000
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 V695,000
Ruined my cat, had both img's replaced. Common issue with this car.
1998 Pontiac Grand Prix- 3.1L V610,000
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
1998 Pontiac Grand Prix- 3.1L V6120,000
Leak from intake under the thermostat housing
2006 Pontiac Grand Prix- 3.8L V6141,000
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
1996 Pontiac Grand Prix- 3.4L V6200,000
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
1997 Pontiac Grand Prix- 3.8L V6
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!!!!!!
2006 Pontiac Grand Prix- 3.8L V6140,000
Leaking coolant from front of engine. Appears to be intake manifold. Not fixed yet. Leak is external only.
1998 Pontiac Grand Prix- 3.8L V695,000
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!!
2005 Pontiac Grand Prix- 3.8L V6185,000
Replaced intake manifold gasket.
2002 Pontiac Grand Prix- 3.1L V665,000
Intake leaked oil and coolant both, had gaskets replaced.
2005 Pontiac Grand Prix- 3.8L V6310,000
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
replace intake seals & fuel injector seals $1200
2003 Pontiac Grand Prix- 3.8L V6127,487
Not fixed yet as I might try to get rid of the problem Started noticing a antifreeze odor and sure enough it was leaking out of a couple areas. One garage will fix ithe leak but says I need a new intake manifold as well. Not going to that shop if I get it done at all.
2002 Pontiac Grand Prix- 3.4L V683,000
The one plactic elbow going into the manifold from the water pump is leaking 0
1999 Pontiac Grand Prix- 3.8L V6278,000
It seems that I get oil in my coolant. It got better after they replaced the front gasket, do to factory recall, but seem to be leaking again.
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