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Old 12-10-2010, 06:33 PM   #16
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GM plastic intake gaskets


Although I have no experience with this particular problem, what I have 'heard' is that the plastic manifold expands/contracts differently than aluminum and the gasket fails prematurely. The revised gasket and torque specs are supposed to cure this problem. I have also heard that the dexcool is marketed to have a 100K service life and people think GM is serious so they don't flush their coolant system until the car hits 100K, which is usually 7 or 8 years. By then, of course, the coolant is probably the consistency of warm oatmeal and is clogging the radiator and hoses. I've seen some nasty pictures of this sludge on the Internet.

I don't know any of this for sure, but this is what I've read/heard around from people supposedly in the know.

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Old 12-16-2010, 05:59 PM   #17
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GM plastic intake gaskets


Re torquing intake manifold 98% of the time well fix the problem
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Old 01-01-2011, 11:19 PM   #18
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GM plastic intake gaskets


we used to do a malibu and or a apv 3.1 and 3.4 engine plastic gasket it is the coolant eating up the seal that fits around tthe plastic gasket not the plasic is the problem they just leak if done right it should last another 30.000 miles unless you flush out the coolant i mean all of it and use the new style dexcool or the green coolant also like the other tech said do the drive shaft seal when apart only takes a few minutes otherwise if it leaks oil it will be another 3.5 hrs back in the mid 2003 years i had the malubus down to 45 minutes i would leave the back valve cover on they never came back but i had a customer take it to another shop for some other reason they sworn i never replaced the intake gaskets the buearo of auto repair inspected it the field inspector could not believe it that he had worked for buick for over 20 years and never seen it done that way he was on my side he told the customer he did not get charged for the rear valve cover gasket just the front one which i had replaced he told the customer techs are in the business to fix the car right but do it in the fastest way possible even if the book says remove both banks valve covers he said it is fixed isnt it i hate customers like that oh well live and learn i get one like twice a year now if i am lucky they take them to independent shops which do ususally crappy work no factory training there is no special policy or recall but g.m. was offering a check for like from $50.00 and up to like $800.00 depending on the coolant dexcool damage either intake water pump or engine just google it i think they discintinued the program but not sure the aftermarket are plastic as well the 3.8 are now met. repairs and have the right equiptment and nationwide warranty 12utchers out there think they know it all but remember at the g.m. dealer that is all we do is g.mal but it is not the plastic which is causing the leak so it really dont matter i would get the g.m. one they come with new bolts have a g.m. dealer do it i have seen some butchers out there they tthink they know it all but we have the right equiptment and if something goes e thermostat and belt and drive seal wrong we do what ever it takes to make it right plan on spending about between $850.00 to $1500.00 on the high side if you need a water pump and a flush and thermostat that should be done because it is already apart and a fan belt usually intake gasket coolant flush surge tank and cap if corroded or swollen and oil change sorry for the long story but you got me going i miss doing these jobs they were easy to do and paid 7.1 hrs for the intake plus 0.3 thermostat 0.3 oil change 0.6 for drive seal belt overlap no labor already off steam clean 0.5 0.3 for pressure test thats almost 9.0 hrs for a job that could start in morning and take it on a road test at lunce time and have another one waiting right behind it now they just dont come in anymore just vrap that takes 3 days and pays 7.0 hts if you are lucky i will try and send you a bulletin if i can do it thru this site
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Old 01-01-2011, 11:20 PM   #19
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GM plastic intake gaskets


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Re torquing intake manifold 98% of the time well fix the problem
hmm i never tried that or seen anyone attempt it just fix it its cheaper than buying another car and have a car payment
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Old 01-02-2011, 07:09 AM   #20
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GM plastic intake gaskets


I know our Nissan isn't GM but I have a leaking intake also. We have a 2000 Altma with 78,000 and have always taken care of the car as we plan on this being our last car. I did mechanic work back in the 60s but this is beyond me and crawling under a car is out of the question for me. I did the carb cleaner while the engine was running and there was for sure a difference so the intake is leaking air. Will it hurt the engine to run it like this? I know the old cars but these new ones I don't. I have thought about using a high heat gasket sealer and put it around the intake leak which may stop the leak but that is just temporary. Will the sealer work?
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Old 01-02-2011, 08:27 AM   #21
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GM plastic intake gaskets


I had a 1999 Jimmy (4.3L) with 120,000 miles on it then that my mechanic spotted a small leak on during an oil change. I had him fix the gasket problem a day or so later. Since he had everything apart he also threw on a new serpentine belt because he knew I was concerned about it. He spotted it because his wife's car had a similar problem and he had a number of others coming, so he always has a set of the improved gaskets on hand. Two weeks later my wife's Blazer (4.3L) also had a new gasket installed.

The mechanic said that there was a battle between the antifreeze manufacturer that GM installed and GM, so there was no recall and many different models were involved.

The 6-7 hours is on the high side if the mechanic is good and knows what he is doing. I dropped of my Jimmy at 4 PM to have the work done the next day, but the mechanic dropped off my car at 9:00 PM the same day. He had to pick up something on the way home, so he used my Jimmy to go the extra mile, but I had to take him back to his shop, which was 1/4 mile away. - Nice to have a honest mechanic so close.

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Old 01-02-2011, 09:38 PM   #22
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GM plastic intake gaskets


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Re torquing intake manifold 98% of the time well fix the problem
Do not waste your time trying to do this. This absolutely will not fix the problem. Typically these gaskets are falling apart when you remove them to replace them. There is no way that retorqueing is going to do any good.
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Old 01-08-2011, 11:41 AM   #23
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GM plastic intake gaskets


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Do not waste your time trying to do this. This absolutely will not fix the problem. Typically these gaskets are falling apart when you remove them to replace them. There is no way that retorqueing is going to do any good.
Yeah, it won't work on an intake manifold gasket. The only application where I knew retorquing did any good was on an old TBI 220 throttle body fuel injector assembly. Sometimes engine vibration would cause a vacuum leak at the throttle body/intake manifold seal and retorquing the mounting bolts would usually seal it. Still, that's way different from a high pressure fluid leak on an an intake manifold. No way retorquing will seal something like that.
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Old 01-30-2011, 01:10 AM   #24
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GM plastic intake gaskets


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Re torquing intake manifold 98% of the time well fix
the problem
No amount of re-torquing is going to fix this. This is what happens when the gasket fails.

97 Olds cutlass 3.1 with an aluminum manifold, my sons car. Was using a bit of antifreeze, I kept an eye on it for months, it got worse suddenly. Lifters started clattering and oil looked like butterscotch pudding.

I had never done one but it was not that bad of a job. I am fairly advanced at this kind of thing and have all the tools and a warm shop. Took a couple hours to get to it and maybe 3 to put it back together. Found one lifter was collapsed and stuck, push rod was completely loose. Had to take the lifter apart and clean it up. Lifters still clattered when I got it back together but came out of it after running a few minutes.

I'm sure I could do a second one a lot faster now! Heard of people paying over a grand to do this job, I used the Fel-pro problem solver gasket set and had about $150 in it with new antifreeze.
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Old 01-30-2011, 08:22 AM   #25
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GM plastic intake gaskets


I have one in the yard with the same problem. You want to come here and do that job again? Po)

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Old 01-30-2011, 08:33 AM   #26
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GM plastic intake gaskets


You might want to call the president of the company, or is that the president of the country, either way they are the same aren't they?

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