Question about 1998 Pontiac Bonneville

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When changing the intake manifold do i need to put oil on the gaskets?

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Leave dry dont put factory back on use the ones called problems solvers these are metal

Posted on Oct 27, 2012


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Posted on Jan 02, 2017

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SOURCE: Excessive Oil consumption, 1995 Bonneville Vin K 3.8

The PCV valve gets it's vacuum from the plenum itself. Some 3.8L have different types of connections on the top of the valve (electrical or mechanical), but none have a vacuum line on them.

If you replaced the lower intake gaskets, it is very likely they crushed around the intake bolts. This will cause oil to leak into the intake and pool in the recesses of the lower intake. You are also likely to be leaking anti-freeze.

This is a very common problem with OEM gaskets. After market gaskets made by Fel-Pro have metal rings in them specially to stop this problem. They are available at NAPA and other stores.

Posted on Jun 06, 2009

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SOURCE: 2000 Grand Am Gt 3.4 V6 keeps overheating,

make sure cooling fan is working , check themastat , water pump .

Posted on Jul 19, 2009

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SOURCE: how do i change the intake manifold gasket

The intake manifold got nothing to do with coolant over heating if that is what you are talking about ?

Posted on Aug 15, 2009

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SOURCE: my intake manifold gaskets went bad so i replaced

maybe a senser

Posted on Jan 17, 2010

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SOURCE: 99 Gran Am 3.4 litre engine, lower manifold leak.

Yes it is common, generally the best thing you can do is buy the most expensive gaskets you can find, use "right stuff" rtv gasket material wherever you can (do not use on seals that come into contact with fuel, and as with all rtvs apply a thin bead and do not spread or smooth with your finger or anything else, just apply and press the part on, if it smears when re-installing remove it, clean it thoroughly and start over). Also be sure to check the manifold for warping or cracking, and have a machine shop resurface all areas that are sealed with a gasket.

Posted on Jan 20, 2010

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My 2008 Chevy uplander engine light on and the code shows for cam shaft sensor and intake manifold what I do

The intake code means its leaking from the intake,bad gaskets, or a vacuum leak. check for bad gaskets on intake manifold. You can tell by putting a bit of oil around the maifold. if it is leaking the engine will flair up. To check this, External leak-- Coolant seeps through the broken intake manifold gasket to the outside of the engine. If its bad enough you will see coolant dripping from gasket. Coolant seeps through the damaged gasket to the inside of the engine, mixing with motor oil. If you suspect an internal leak, check your oil dipstick. Or if you have a substance under oil filler cap that looks like a milkshake, Oil is mixing with coolant. this means intake gaskets are bad, Now for the camshaft sensor, If you have a manifold leak. this could be giving you a false camshaft reading! Because, If sensor is bad vehicle will not start unless theres a wire problem. Symtoms of a bad sensor are--- engine sputtering, poor acceleration, stalling/inability to start. HopeI helped you out! Good-Day!

Jul 26, 2014 | 2008 Chevrolet Uplander

1 Answer

On a 3500 dulley 4x4 big block chevy gas engine, I have a cylinder 8 misfire and engine light. It also had a mass aire flow indication but that was replaced. only 86000 miles on 03 truck

Check the intake manifold gasket. If it leaks it will draw air into engine and this air bypasses the mass air flow sensor which will cause a rough idle or running symptom from running too lean. If you change the intake manifold gasket you should probably change the valley pan gasket at the same time. A dealer will change both for less than $500 and you might save some more if you dig around on GM Service website and find a coupon discount (Usually 10%-20%). You might save more at a local shop if you trust them and they do this type of work. Getting to the intake manifold gasket also exposes the valley pan and since you are already there it only takes a little more to change that gasket too. Some GM V-8 engines use a little oil between oil changes and if both gaskets are meticulously changed at the same time it will sometimes fix the oil usage. It did for me on my Tahoe (126k miles).

Jun 10, 2014 | 2002 Chevrolet Tahoe

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I have a 02 Chevy sounds like coolant rushing throughout the engine while sitting at an idle and about every 2 or 3 days I gotta add coolant its not much also the low coolant light comes on...

I would perform a coolant pressure test because these engines are known for leaking intake manifold gaskets.Check and see if your oil is starting to turn a creamy tan color.

Jan 24, 2012 | 2002 Chevrolet Tahoe

2 Answers

My oil is a light brown color

This is not good. It means that antifreeze is getting into the oil. This is usually caused by damaged intake manifold gaskets. Replace the lower intake manifold gaskets and change the oil. Run the engine long enough to reach operating temperature and change the oil and filter again. Then cross your fingers and hope that there is no bearing damage. If the engine is knocking, you will have to replace the engine.

Mar 06, 2011 | 1999 Chevrolet Suburban

3 Answers

What would cause oil in coolant and leak near intake manifold?

Head gasket, if you have a V6 or a V8, can't tell which one is at fault, so both will might as well be changed.
If the leak near the maifold is oil, the valve cover gaskets are leaking.
When head gaskets are changed, all the necessary gaskets come in the gasket kit.

Apr 23, 2010 | 1997 Cadillac Catera

2 Answers

So this is my problem....i own a 2004 crown victoria unmarked police unit. it all started when the check engine light came on. i got the code, it said something about the spark plugs. i changed all 8 with...

possible bad rings, i would put some motor tune-up in oil will clean carbon off rings, its made by company called seaform and is called motor tune-up, put hole can in oil and drive for about 30 days ,its good stuff can also use in fuel to clean injectors, could also have worn out valve stem seals causing oil to leak pass valves into cyl

Feb 05, 2010 | 2003 Ford Crown Victoria

1 Answer

Always low on oil

if it's 5.2 or 5.9 engine,the intake manifold plenum pan gasket may be drawing oil from lifter valley of engine..remove air cleaner and check down inside manifold with throttle plates wide open and look for oil pooling inside intake..if there is oil in there,you to remove intake manifold and replace gasket and bolts holding rectangular pan to bottom of will need intake gaskets as well..suggest going to dealer for parts..fairly inexpensive as well..i hope this helps

Jul 19, 2009 | 1999 Dodge Durango

1 Answer

Coolant leak at rear of manifold

Hello glennjenkins: My name is Roger and I will help you. You did not say what size the engine was in your car? I will assume it is a 3.8 v-6.The problem most likely is the intake gasket. These engines were built with a intake manifold set made of plastic. Over time they will crack and start leaking. The fix is to replace the gasket set. You should change the oil and filter when changing the intake set. When you pull the intake you will have coolant run into the oil pan. Also when the gasket leaks it is possible for coolant to leak into the oil pan. To replace the intake gasket does require some special wrenches. Such as a inch pound torque wrench and a torques socket for a special headed bolt.
Should you need further help please just ask. Please rate the quality of the answer you received. This way we know you received helpful information. Thank You for using Fix Ya. Roger

Jul 08, 2009 | 1991 Oldsmobile 88

1 Answer


The intake manifold gaskets are the ones you need to be concerned with.

Oct 08, 2008 | 2001 Pontiac Grand Am SE

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