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  1. #1 Intake Manifold .. Leaking 
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    Question!
    Car and Engine type.. 1999 Pontiac Grand Prix 3.8L 3800 Series 2.
    Engine intake manifold gasket is failing.
    Oil is leaking into coolant.

    Is engine done for? It has been ran for a lot of miles

    I would like to fix the car, but I don't have money for a new engine. Can anyone help me diagnose what the problem is? And how to fix it? (Tools, parts needed... video?)
    As I stated before, I am leaking coolant into my oil. I have not noticed coolant leaking into the oil..


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  2. #2 Re: Intake Manifold .. Leaking 
    I live here. Slick2500's Avatar
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    Oil is getting in the coolant or is coolant getting in the oil? If the oil is just getting in the coolant then you can just flush out the coolant really good. If the oil is getting in the coolant, change the gaskets and flush the oil/coolant out of the engine block, drain old oil out and in fresh oil and filter let run for about 20 min or so, then change the oil again. Make sure to dump some oil down the lifter valley before the first oil change.
    When the engine is done for you will know, from the noise it will make.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  3. #3 Re: Intake Manifold .. Leaking 
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    Can you provide a video with dialogue on how to replace the gaskets on the engine? Someone stated it might be the LIM Gasket... But shouldn't I just replace them all while the engine is taken apart?

    And tips and tricks to a first time Intake manifold repair?

    Looking into Aluminum gaskets...

    Oil is getting into coolant. I do not notice traces of coolant in the oil...
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  4. #4 Re: Intake Manifold .. Leaking 
    I live here. Slick2500's Avatar
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    This is the best video you are going to get, it is on a l67 but the l36 is the same under the blower/upper intake. And yes get the aluminum gaskets stay away from the plastic ones, they will fail again.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  5. #5 Re: Intake Manifold .. Leaking 
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    you not getting oil in the coolant, its pretty much impossible.

    if you see brown slime in the rad and on the cap its just dex coolant sludge.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: Intake Manifold .. Leaking 
    I live here. Slick2500's Avatar
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    Quote Originally Posted by ScottyDoggs View Post
    you not getting oil in the coolant, its pretty much impossible.

    if you see brown slime in the rad and on the cap its just dex coolant sludge.
    I would still do the lower intake gaskets and flush everything out real good.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  7. #7 Re: Intake Manifold .. Leaking 
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    flush is always good.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #8 Re: Intake Manifold .. Leaking 
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    I am seeing the brown sludge! That's what me think it was oil in the coolant!! So I am mistaken????
    Is there a specific way to tell if there's oil leaking in the coolant, or coolant leaking into my oil other than sight?

    Just to be sure if I go about this.. I was going to flush coolant radiator clean radiator, clean overflow coolant. Try to flush and clean toobing..

    Replace Lower intake gasket replace upper intake gasket.. replace upper intake manifold...

    Flush engine with oil ...
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  9. #9 Re: Intake Manifold .. Leaking 
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    its dex sludge. not oil.


    how to flush coolant.

    remove the t stat, put the t stat housing back on, take the upper hose off the radiator, then push it down to the ground to a bucket or let it fly.

    get your garden hose out, put it in the rad turn it on, then fire up the car, let it run till clear water pumps out the top hose.

    then turn the hose off, run the car till no more water comes out the upper hose. then turn it off.

    put your t stat back in, with new gasket, the upper hose back on.



    now take 1 gallon of full strength green antifreeze, not the 50/50 crap. ( parts store cheap green is fine to use) dump the whole gallon in the radiator, fire up the car, fill the rad with hose water till its full. top as needed till its ready to be bled of air. it will burp and take coolant as the water in the block warms up the t stat opens up for a few seconds till cold coolant hits it and it shuts again.

    now to bleed the air out, let it idle rad cap off till the fans turn on, (when the fans are on the temp is over 195 deg, the t stat is wide open) then open the bleeder screw on top the t stat housing a few turns till a steady stream of coolant comes out the hole, shut the screw, top off the rad. cap it.

    done.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #10 Re: Intake Manifold .. Leaking 
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    Quote Originally Posted by ScottyDoggs View Post
    its dex sludge. not oil.


    how to flush coolant.

    remove the t stat, put the t stat housing back on, take the upper hose off the radiator, then push it down to the ground to a bucket or let it fly.

    get your garden hose out, put it in the rad turn it on, then fire up the car, let it run till clear water pumps out the top hose.

    then turn the hose off, run the car till no more water comes out the upper hose. then turn it off.

    put your t stat back in, with new gasket, the upper hose back on.



    now take 1 gallon of full strength green antifreeze, not the 50/50 crap. ( parts store cheap green is fine to use) dump the whole gallon in the radiator, fire up the car, fill the rad with hose water till its full. top as needed till its ready to be bled of air. it will burp and take coolant as the water in the block warms up the t stat opens up for a few seconds till cold coolant hits it and it shuts again.

    now to bleed the air out, let it idle rad cap off till the fans turn on, (when the fans are on the temp is over 195 deg, the t stat is wide open) then open the bleeder screw on top the t stat housing a few turns till a steady stream of coolant comes out the hole, shut the screw, top off the rad. cap it.

    done.
    Thanks for the numerous plasterings of this method on the forum. I followed this method over the weekend to make the switch to green. The only thing I messed up was I didn't run the upper hose dry before reinstalling the thermostat. When I filled up the radiator with coolant and left the upper hose and radiator cap off - the radiator started spewing coolant. I didn't quite understand why this happened, does it have to do with the thermostat being closed and/or being a pressurized system?

    Also, trying to capture the old coolant is a bit of a lost cause. Now I know why you phrased an alternative as "let 'er buck!" Now I just have a 5gal bucket of diluted Dex in my garage :/
    2008 Grand Prix Base: Engine cover delete , flipped dogbone bushings, Transgo shift kit, Hayden 403 trans cooler,
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    we are all anal about our vehicles. Otherwise we would not be on an extinct platforms forum debating 3000 dollars cars!
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  11. #11 Re: Intake Manifold .. Leaking 
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    I am also leaking oil from the top of the intake manifold gasket though. It's dripping down all the way to the transmission pain. Didn't notice till a popped a tire..
    Can you go over that with me also? Thank you very much in adv.
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  12. #12 Re: Intake Manifold .. Leaking 
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    theres no oil in the intake. so it cant leak oil.

    valve covers, oil pan, oil pressure sensor leaks are all possible.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  13. #13 Re: Intake Manifold .. Leaking 
    Turbo is the way to go. BillBoost37's Avatar
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    Oil is splashed in the lifter valley, sure you could seep a little out the end seal. It would be very little, most likely your leak is a valve cover gasket for oil that high in the motor.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  14. #14 Re: Intake Manifold .. Leaking 
    Turbo is the way to go. BillBoost37's Avatar
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    You guys are aware that regular old green is bad for the coolant system based on the amount of aluminum in it? You'd be much better off with anycolor.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  15. #15 Re: Intake Manifold .. Leaking 
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    Quote Originally Posted by BillBoost37 View Post
    You guys are aware that regular old green is bad for the coolant system based on the amount of aluminum in it? You'd be much better off with anycolor.
    I really got used to everyone saying go green...

    I had mine flushed at a quick fix place, they used universal....so I topped it with orange.
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  16. #16 Re: Intake Manifold .. Leaking 
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    Quote Originally Posted by BillBoost37 View Post
    You guys are aware that regular old green is bad for the coolant system based on the amount of aluminum in it? You'd be much better off with anycolor.
    How would we know that if everyone "knowledgeable" is saying plain old green? What are we supposed to be using if Dex is the devil?
    2008 Grand Prix Base: Engine cover delete , flipped dogbone bushings, Transgo shift kit, Hayden 403 trans cooler,
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    we are all anal about our vehicles. Otherwise we would not be on an extinct platforms forum debating 3000 dollars cars!
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  17. #17 Re: Intake Manifold .. Leaking 
    Turbo is the way to go. BillBoost37's Avatar
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    You saying , I'm not knowledgeable?

    I never say use green
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  18. #18 Re: Intake Manifold .. Leaking 
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    Also, how do I kill a thread? Close thread?

    I was going to open a new one.
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  19. #19 Re: Intake Manifold .. Leaking 
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    Haha can someone recommend me a brand or two of coolant I should use?
    I''m flush my coolant system and swapping out a new Radiator..

    I don't want to see sludge again =/

    But I don't want my car to over-heat...
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  20. #20 Re: Intake Manifold .. Leaking 
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    why close it? and why a new one?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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