Question about 2002 Chevrolet Malibu

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Replaced intake gaskets.ran fine before. burns antifreeze now

I replaced upper and lower intake gaskets. ran fine before. now it runs rough and burns antifreeze. did i miss a o-ring somewhere?

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  • jtucker85 Jun 02, 2009

    I used a felpro kit.

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Sounds like the gasket is not sealing correctly, or you have a cracked head. Did you use a factory gasket from the dealer? If not, this is most likely the reason. Haven't had much luck with the aftermarket stuff working correctly on those.

Posted on Jun 02, 2009

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White smoke in exhaust 1999 lincoln after replacing intake manifold


Sounds like antifreeze leaking in to me. Ports at rear of intake are trick and easy to get that gasket mis-aligned. Hate to say it but when you take the intake back off I imagine the culprit will be obvious. Only other thing is that the intake wsa fine and you actually had a blown head gasket.

Apr 17, 2013 | 1999 Lincoln Town Car

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2001 Buick Regal keeps stalling and running rough has white smoke coming out of tail pipe


The upper intake plenum is leaking coolant into the cylinder heads. The head gaskets on this motor are awesome. So, chances are it's the upper intake plenum. You can check this, by removing the vacuum hose that runs between the upper plenum and the brake booster. Stick your finger in and try to touch the top of the lower intake manifold. If your finger is wet it the upper plenum. You might as well replace the lower intake gasket while you're performing this work because they are prone to failure also. Use a shop vac to pull any coolant out of the cylinder heads. Get brand new spark plugs because the old ones are probably fouled. Once you get the plenum and gaskets replaced, remove your fuel pump relay and leave the spark plugs out and turn the engine over repeatedly for about 10 seconds to push any excess coolant out of the cylinder heads. Then, put the spark plugs in and turn the engine over for 10 seconds again. This will burn excess fuel as coolant out. Then, replace the fuel pump relay to allow fuel to be pumped into the heads. Car will smoke for a few when it fires up, but will clear out quickly. CHANGE THE OIL! Twice within a week if possible.

Jul 23, 2012 | 2001 Buick Regal

1 Answer

Losing antifreeze changed thermostat and resivoir cap


Check you oil for signs of coolant contamination. If coolant is present in the oil, you may have a leaking head gasket or intake manifold gasket. If there is no sign of coolant in the oil, the antifreeze could be leaking past the intake gaskets and into the combustion chamber. It could also be a leak that only shows up when the engine is running, and you are losing the coolant as you drive. This kind of leak is very difficult to locate. You will have to look for signs of antifreeze around the upper and lower intake gasket area with a strong flashlight. Also check for signs of leakage at the upper and lower radiator hose connections and the drain valve at the bottom of the radiator. If you smell antifreeze inside the car, check the carpet for dampness caused by a heater core leak. Sounds like a lot of work, but these mystery leaks as I like to call them, can take repeated inspections before you finally locate them. I hope I have been of some help. Good luck and let me know what you find.

Feb 22, 2011 | 2002 Oldsmobile Intrigue

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I started the blazer and it is idleing really rough. then I get a mile down the road and it dies on me. I just replaced the thermostat and fuel filter bc it wont hold antifreeze and keeps overheating. What...


The loss of coolant, overheating and running bad could add up to coolant leaking into the engine. The Dexcool antifreeze used in the GM vehicles has caused gasket failures in the upper air plenum and the lower intake manifold. This could allow the antifreeze to be pulled into the combustion chamber and the oil. If there is no visible external leak, then this is probably what's happening. Sometimes the gasket leak will show up as a very small and difficult to detect puddle somewhere around the gasket/engine mating surfaces. Also look for signs of coolant in the oil. If it has gotten into the combustion chamber, then it has probably ruined the O2 sensors and catalytic converter. The only solution is to pull the upper and lower intakes and replace the gaskets. Change the oil and filter. DO NOT put Dexcool back in the radiator. Use a green antifreeze that is labeled compatible with aluminum engine parts and radiators. Replace the O2 sensor. The catalytic converter might have survived. Get it running first, then worry about the converter. Good luck to you, and try to have a Merry Christmas.

Dec 23, 2010 | 1996 Chevrolet Blazer

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I have a 99 olds 88 LS with a 3.8 and one day when leaving work I noticed white smoke out of the exhaust which turned out to be steam. I have removed the intake top half and found antifreeze all over this...


Yes, I think that is exactly the problem. This engine is known for bad original equipment lower manifold gaskets (use a fel-pro set) and for those upper manifolds to go bad, and especially there is an EGR tube in that upper manifold that you will probably need to replace.
I have seen this a lot on a forum for Buicks (same engine as your olds), and a lot of help can be found there or at an Oldsmobile forum. Probably lots of videos on you tube regarding this engine and how to replace the upper and lower intake gaskets, and that troublesome egr tube. This is well known- you will not have to mess with the heads anymore, just the intake manifolds.

May 01, 2017 | 1999 Oldsmobile 88

3 Answers

Lost power and smokes like the dickens


If it's white smoke, the head gasket is blown
If it's blue smoke, major problem, valve and piston and ring job.

Feb 02, 2010 | 1999 Dodge Ram 2500 4WD

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My 98 olds intrigue is losing antifreeze. Its not in the oil or on the ground, where else can it be going???


Let me guess - you have roughly 100k give or take 20k miles on your car, I had the same exact problem, you need to replace your intake, it costs roughly $150 for everything and it takes about 4-6 hours, common hand tools and some patience - the stove pipe coming from your EGR slowly deteriorated the coolant passage in the intake directly behind the throttle body from the excessive heat as well as the acidic properties of the dexcool antifreeze - The Dorman intake manifold has a redesighned stove pipe and works great and as well as flushing out the Dexcool and using the old fasioned green antifreeze - Don not be fooled into it being the Head gasket, the 3800 engine is bullet proof and is not know for head gasket failure - once you have the intake off you will see antifreeze in your intake. - Also a word of advice, while you are in there replace your lower intake gasket as well, you will be thankful you did, Auto Zone carries everthing you need as well as the repair guide available online.

Oct 15, 2009 | 1998 Oldsmobile Intrigue

1 Answer

Have a 1999 lexus es300. Getting indications that knock sensors need to be replaced. Car has 144k miles. What do the knock sensors do and how easy / tough to replace?


If you have some common tools the knock sensors are no big deal.  If you take a lexus they will make is sound like you need to completely disassemble the engine and scare you off.
First, do you really have a problem with preignition causing real knocking due to carbon buildup, or diluted gasoline or do you have failed knock sensor(s).  Try to decarbon the engine first.
There is a technique used with water being sprayed into a warm engine intake.  This will clean up the valves and carbon buildup which can result in engine knocking.  

The job will be a couple hundred for the parts and a couple hours of your time.  After you are done, you have entitled yourself to approximately $500 in new tools for your tool chest since this is what Toyota and Lexus will charge to fix (about $1k+).

You will need to buy the following to address the knock sensors and a couple other items while you're in the neighborhood.
- 1x upper intake plenum gaskets - 2x lower intake plenum gasket - coolant bypass hose found in the same area as knock sensors - 2x knock sensors (bank1 and bank2) - short pig tail cable which connects both knock sensors to common wire harness. - toyota antifreeze  (2 gallons, if i remember correctly... when mixed to 50/50 (antifreeze/ water) you will have 4 gallons.
drain the radiator drain the front of the engine using the engine drain plug - this plug is on the front right side facing the engine, behind the right hand exhaust manifold. (this will lower antifreeze enough to avoid dumping antifreeze all over the engine later) remove the air filter box remove the connections into the throttle body remove the cable from the throttle control remove the upper air intake plenum remove the two lower air intake plenums remove the antifreeze fill port
Knock sensors will be in the valley between the lower intake plenums.  You will need to remove the rubber antifreeze bypass hose (little short hose blocking access to the knock sensors).
By the way, the reason you bought a replacement, is that if this short hose splits from normal wear, you need to spend this money and effort to reach it, so just do it now.
The little pig tail cable which connects both knock sensors to the wire harness is said to cause a big majority of the problem due to the plastic getting hot and brittle, falling off and shorting to the engine.  While in this mode the engine thinks knock is occuring and starts to retune the air fuel mixture to get rid of the knock until it goes into minimal operations mode.
After replacing the knock sensors (and tighten to torque specs), replacing pig tail cable, and reinstalling your new short by pass hose.  Replace the lower gaskets, antifreeze fill port, lower intakes, upper gasket, upper intake, air intake, air filter, reattach everything, reconnect all the rubber lines you pulled off, make sure there are no splits in the air intake passage anywhere, retighten the engine antifreeze drain plug, and the drain on the bottom of your radiator, and your done!
Don't forget the easy stuff.  Dilute the antifreeze with water and fill the radiator and overflow tub.  Run the engine for several minutes until its hot and opens the thermistat to allow antifreeze into the empty engine cavities.  Turn the engine off and get a cold one as the engine cools.  Once absolutely sure engine is cold, refill the radiator with antifreeze and refill the reserve tub.  Do this at until all the beer is gone and you are both full of antifreeze (in one form or another)..... obviously red stuff in the car, amber down the gut.

Jul 27, 2008 | 1998 Lexus ES 300

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