Intake Manifold Gasket May Leak Coolant or Engine Oil on Chevrolet Impala

The intake manifold gasket can develop external engine oil or coolant leaks. In some cases the failed gasket will leak coolant internally. The manifold gasket will need to be replaced to correct this issue.

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Average mileage: 106,901 (6,000–260,000)
Engines affected: 3.4L V6, 3.5L V6, 3.8L V6, 3.9L V6
11 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006, 2007, 2008, 2009, 2013
103 people reported this problem
57 people shared problem details
2003 Chevrolet Impala- 3.8L V674,000
i have a leak in the intake manifold. gasket..tried using this stop leak.. treatment for leaky coolant.system seems to have helped. not much leakage. but still need to get it fixed but it costs so much. money. is there a class action suit for this. defect???
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2002 Chevrolet Impala- 3.4L V6194,238
I was told intake manifold gasket was leaking coolant and possibly oil. If this is such a problem how come no recall? Is there a lawsuit for this?
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My oil level kept going down to the point where I was adding 1 quart every 1000 mies. Gas milage was cut to 18 mpg avg. where it used to be 26 mpg avg. Acceleration was terrible, especially uphill. I pulled the intake manifold and found the original gasket was basically gone! There were little bits and pieces stuck in near the cooling ports. Oil was getting into the intake side because of this failure and thus clogged the catylitic converter! I replaced the intake gaskets (upper and lower) and the converter. Oil had got into the cooling systen too. I flushed out all DEXCOOL and replaced it with conventional "GREEN" antifreeze. Dexcool degrades the gaskets rapidly!
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2003 Chevrolet Impala- 3.8L V6
GM should have issued a recalled but i just their cost would have been too much since so many cars have the same problem
Upset , due to started back last summer noticed a wine like the water pump was going out. and puddles under car after it cools off. not alot . After just going through that already with another car, I told the mechanic to replace it I wanted it to be fine for this winter. , 2 months went by still see puddles but rad. and over flow and oil are full.. call him back told him,took it in dropped it off and he stated couldn't find anything, 2weeks still doing it , dropped it back off stated radatior was gone,and its scensor, had thoses replaced and done, and still acting like it was going to over heat, dropped it back off and he stated that he needed to replace the plastic elbows that go into the intake , replaced those, still doing it, drive it and it still doing it told him he needed to replace this water pump that he just put in that something is still wrong.., due to it started to make a sound like it was clicking , Dropped it off yest. NOw states it has compressed lifters, it blow out a glasket on the water pump and the new radaitor I JUST PUT IN and an Intake Leak !
2004 Chevrolet Impala- 3.8L V6108,000
Lower intake manifold gasket is leaking antifreeze and needed to be replaced, also an oil change and some hoses replaced as a result.
2000 Chevrolet Impala- 3.4L V6102,000
Intake manifold leaked into the radiator
2003 Chevrolet Impala- 3.4L V674,354
Engine was overheating. Intake manifold gaskets were fried and needed to be replaced. Mechanic said happens all the time on GM's.
2001 Chevrolet Impala- 3.8L V6192,000
I wish I knew before I started to hear the bearing knocking. Now I need another engine.
2002 Chevrolet Impala- 3.8L V6105,000
Leaking intake manifold
2008 Chevrolet Impala- 3.9L V682,000
Engine oil leaking onto my garage floor. Reported it at the dealer and was told it was the Oil Pan gasket ($600 to fix!). When car was in the shop, I was called and told it was the Lower Intake Manifold gasket!!! ($$$), am not very happy....
2001 Chevrolet Impala- 3.8L V6198,000
Constantly losing coolant
2005 Chevrolet Impala- 3.4L V6160,000
Not fixed yet. Gave us problems over summer. Hesitation, sudden shut off during braking or slow downs before turning. Of course, you immediately lose power steering and power brakes. This was horrifying specially when turning into a tight one-lane-per-direction private path with an oncoming car. Restarting the engine becomes difficult and requires several retries, depressing the gas pedal and keeping it on for 5-10 seconds once it starts then slowly releasing the gas. I learned to quickly switch to neutral and do all this then back to drive while trying to force the steering wheel to avoid obstacles. The problems start when the engine warms up and starts to follow front O2 sensor. Cylinder 5 continuously misfires because of the leak (counter keeps running fast on OBDII code reader). Cylinder 4 and another one misfire at a less frequency. But the computer tries to reduce hydrocarbons by reducing injected fuel which shuts the engine off. Mechanic has been busy and sending my back. Today I made him disconnect the Coolant Temperature Sensor to force a rich fuel mix and stop the computer from using the O2 sensor. Will keep calling him daily until it gets fixed. Unnecessarily replaced wires and spark plugs a month ago (with LASER IRIDIUM for a car that is already 214k km and 10 years old) through a different mechanic who apparently was going to slowly make me replace everything before telling me it is the gaskets. Didn't trust him (specially that he charged me for reading engine codes but never gave them to me) and will keep trying with my original mechanic. Wish there was a recall on this one. BTW, I couldn't give a Canadian postal code. and approximately converted mileage from 214k Km.
2001 Chevrolet Impala- 3.4L V6124,000
Intake manifold gasket failed and was leaking antifreeze.
2000 Chevrolet Impala- 3.4L V683,183
I have this problem on a 2003 which I bought new. It has caused me much problems in oil and coolant replacement. II also had to put 2 new catalytic converters because it gums up the substrate. DD
2007 Chevrolet Impala- 3.9L V684,500
Engine oil leak
2003 Chevrolet Impala- 3.4L V6183,252
Smoking left side of motor smell coolant but not running hot... Weird
2000 Chevrolet Impala- 3.8L V623,000
Bubbling in the radiator, over heating, loosing water out the over flo, exhaust blows in the radiator, replaced intake gaskets, upper , and lower, same thing, happened as soon as I stated it, now I'm replacing the head gaskets, the back head gasket was rotted, I replaced both, Blu dyed the surface, ran a fine hone across the surface, no obvious warping, slapped it back together, today, I will start the engine, and pray it was the head gaskets,if it does the same thing, I'm ready to junk it,
2000 Chevrolet Impala- 3.4L V6194,000
water in oil oil in water
2003 Chevrolet Impala- 3.4L V6103,000
Oil leaked into the antifreeze system.
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