Intake Manifold Gasket May Develop Engine Oil and/or Coolant Leak on Buick Park Avenue

The intake manifold gasket may develop external engine oil and/or coolant leak. The intake manifold will need to be removed and the gasket replaced to correct this issue.

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Average mileage: 129,321 (36,000–203,000)
Engines affected: 3.8L V6, 3.8L V6 Supercharged, 4.2L 6 Cylinder
15 model years affected: 1991, 1992, 1993, 1994, more1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
67 people reported this problem
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Viewing 1 - 20 of 31 problem details
1999 Buick Park Avenue - 3.8L V6 Supercharged 125,000 mi,
Just picked up my buick yesterday 7/27/2013. 960.00. replaced intake manifold gasket and head gasket. drove sixty miles. almost maded it home. car runs mildly hot...not even 3/4 on temp gauge. turned off ac and turned on heat. gauge started to cool, then engine ran rough. pulled into gas station. car will not crank. what is causing the manifold to fail? thermostat? I read oil pump? anyone, anyone? waiting on mechanic to pick up car today and have a do over
1995 Buick Park Avenue - 3.8L V6 107,000 mi,
wht smoke from exhaust will not stay running once i take foot off gas pedal oil ontop of engine by fuel injectors. antifreeze n oil oil drips on garage floor
1998 Buick Park Avenue - 3.8L V6 81,000 mi,
coolant leaking around on to manifold and possibly oil as well.
2002 Buick Park Avenue - 3.8L V6 119,000 mi,
antifreeze and oil is near my engine compartment and car wont start!
2003 Buick Park Avenue - 3.8L V6 Supercharged
Intake Manifold gasket failed, developed a leak - as indicated by coolant pooling on manifold. This leak was very slow, and I had no driveability issues, but finally took care of it. If this happens to you - have the mechanic check your oil pump as well, since the gasket material can degrade into your engine coolant and "sludge" up the pump, screens, etc. in your oil system...I am dealing with this right now.
2003 Buick Park Avenue - 3.8L V6 Supercharged 98,000 mi,
I never had a clear sign that there was any overheating occurring, my 2003 Park Ave. Ultra just stopped at an intersection. The only indication I had was that the temp. gauge was inching up a little over halfway to "H". No light indicators, no "check engine light" on. One thing I should have noticed was the smell of antifreeze. I had been smelling it for perhaps a month, but always thought it was someone else's car. Car cut off at intersection when waiting for the light to change. Wouldn't crank except for one time to allow me to get it out of the intersection. Mechanic found coolant stains on the engine and no more coolant in the overflow tank. Machanics replaced manifold intake and thought it was fixed, but it cut off at the shop when they tested it before I came to retrieve it. Replaced the MAP (Mass Airflow sensor) and the mechanics say that it is fixed now and runs well without cutting off. The test will be in the running for the rest of the week! They also replaced the fuel filter and the temperature gauge. All at the tune of about $1,300.
1998 Buick Park Avenue - 3.8L V6 125,000 mi,
starting loosing antifreeze in oil, overheated and white smoke started coming out of pipe. Replace upper intake gasket, problem resolved.
2002 Buick Park Avenue - 3.8L V6 131,000 mi,
Was loosing coolant slowly, every few days but couldn't find a leak. Took to repair shop who showed me leak in front of rear cylinder bank where the upper manifold gasket was leaking. I got All-Data repair info and fixed myself saving hundreds of dollars. Now my water pump has developed a leak due to my changing coolant from DexCool to green after flushing it well. A Firestone dealer told me the DexCool does contain better lubricating oils for the water pump and that once you go to green normal extended life coolant the pump may well leak within 9-12 months, exactly what happened.
2000 Buick Park Avenue - 4.2L 6 Cylinder 100,000 mi,
Coolant pouring out from under car & heater stopped working due to low fluid level. Thought to be water pump but after further inspection turns out to be manifold intake gaskets.
1996 Buick Park Avenue - 3.8L V6 177,000 mi,
Coolant leaking pass the water pump closer to the engine block. It looks like it's coming from a seal
2002 Buick Park Avenue - 3.8L V6 Supercharged 85,000 mi,
had oil leaking from front valve cover onto lower engine area causing burning smell which filtered into car. fixed it by pulling valve cover off and replaced old gasket w/ new. solved problem. easy fix...few hrs.
2001 Buick Park Avenue - 3.8L V6 83,000 mi,
When i got a tune up this year 2014,my mechanic told me about the gaskets need to be replace,haven't fixed yet because of money issues.
1998 Buick Park Avenue - 3.8L V6 Supercharged 130,000 mi,
backfired upon starting..then smoke and the smell of coolant
2000 Buick Park Avenue - 3.8L V6 163,000 mi,
Has always been a small leak since we got it (88,000 miles), unfortunately it has gotten significantly worse after using synthetic several times. The car now will lose about 2/3 qt oil between 3k mile changes.
2004 Buick Park Avenue - 3.8L V6 Supercharged
was told it might leak. was told to fix or might cost 2000.00 later. so I fix it and it cost 600.00
2004 Buick Park Avenue - 3.8L V6 Supercharged 127,000 mi,
Intake leaking cooling fluid from system air flow unit. Need to intake
2001 Buick Park Avenue - 3.8L V6 Supercharged 36,000 mi,
Coolant leak manifold
2003 Buick Park Avenue - 3.8L V6 115,000 mi,
Oil leak around manifold gasket. Have had this replaced at around 30,000 miles. Then oil started showing up again around 60,000. We're just letting it ride due to cost of replacement. But it doesn't seem too bad on the oil leak.
2003 Buick Park Avenue - 3.8L V6 Supercharged 129,000 mi,
overheats constantly having to spend $1000 just to get it fixed. this is a common problem for all gm vehicles with the 3800 v-6 engine. The only thing dependable about this engine is that you'll have enough time to drive it to the repair shop before it blows on you. GM knows this is a problem and refuses to address it. Take my advice don't buy one!
1995 Buick Park Avenue - 3.8L V6 150,000 mi,
Replace intake and upper and lower intake gaskets, after repair the valve seals leaked, causing smoking oil burn from exhaust after idle at stops, possibly due to damage caused by antifreeze in oil.