Pontiac Grand Prix Problem Report

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

(85 reports)

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.

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. -
The coolant is leaking in to the engine,the intake manifold gasket is being replaced to correct. -
Ruined my cat, had both img's replaced. Common issue with this car. -
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 -
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? -
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. -
Leak from intake under the thermostat housing -
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 -
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 -
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!!!!!! -
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. -
not leaking in the oil just external coolant leak not repaired yet but thinking about an intake sealant in the rad. -
Air in cooling system low coolent level, coolent leaks, low heat -
Head gasket leak, and intake manifold also leaking. -
antifreeze leaking into oil, replaced intake gaskets at dealer $670 -
Problem was not diagnosed until after heater stopped pumping hot air into cabin (coolant was disappearing from cooling system but no leaks external to the engine) and this started ~110000 miles. Between the 110k and 123k mile markers, the cooling system was flushed at which time oil was found mixed with coolant (see problem with heater mentioned above). To fix the coolant/oil leak, the upper/lower intake gaskets were replaced and the problem has not resurfaced. -
Non stop since I bought it in 2002 - I have taken this is to many times to count to be fixed and I will be taking it in again in the next couple of weeks. Good thing I have anotehr vehicle to drive. -
Leaking coolant, took to my mechanic who said it was the intake gasket. He said it was a small leak and he recommended flushing out the radiator and putting in new coolant. Said because it was such a small leak that it should still run some time before having to replace, since it is quite costly. I'm going to sell the car without fixing the problem at a reduced price and telling anyone interested in buying it, what's wrong with it. Other than this problem, it has been a reliable car with only minor repairs since purchase. The car has been regularly maintained. -
didn't know what it was for a long time but certainly noticed it, been trying to diagnose the car, read about that, pulled apart the plenums and sure enough not only was it blasted, but was a felpro gasket so it was already changed at least once before i got the car. put the car back together and won't start, careful with putting it back together, no idea what we are missing now -
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