Question about 1997 Buick LeSabre

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Coolant in the cylinders

I just changed the plenium gasket on my 1997 buick lesabre with the 3.8 liter. and now i have coolant in all of the cylinders . i have heard that gm's are know for the upper intake (plenium) problems but i am really stumped on what to do can you help me out???????

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  • 64 Answers

Hi! It could be that the gasket was not placed or torque properly.Why did u changed the gasket?

Posted on Jan 25, 2009

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Posted on Jan 02, 2017

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1 Answer

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1 Answer

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better change out your Plenium (Intake) before it ruins your engine ! Part is about $125.00 and comes with gaskets and a new Intake and new EGR Tube you replace also, what it is doing is leaking internally and burning it, it will eventually start to miss and quit on you Hydrolocking the engine. water does not compress in cylinders. If you are lucky you won't have to do lower intake gaskets or head gaskets......But get it fixed before too LATE !

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1 Answer

Engine blew white smoke. I replaced the head gasket and intake(lower) gasket. It still smokes and is getting antifreeze I'n the cylinders. I did not replace the plenium chamber gasket. Their was some...


Hey Baptized,
You need to replace ALL the gaskets that seal coolant from ANYTHING... You may have a cracked head, cracked intake manifold,, or at worse a cracked block - between the coolant passages and the combustion chamber area...If you have a aluminum intake and cast iron heads.. this is a potential leak creator when the engine gets hot and cold quickly...make sure ALL the gasket surfaces are CLEAN.. and use:
http://www.oreillyauto.com/site/c/detail/PERN/80064/N2362.oap

DO NOT use silicone sealant - period!

Jun 10, 2017 | 1998 Buick LeSabre

1 Answer

How do I replace the thermostat on my 2000 Buick Lesabre Limited 3.8 liter V6?


find where the upper radiator hose goes into the engine. the thermostat lives under that cover. drain some coolant from your COLD engine(to avoid burns) remove the bolts and replace the thermostat. be sure to also purchase a new gasket. some 3.8 s use both a rubber and paper gasket. parts store should have listings. reinstall, refill coolant, and run engine, topping off coolant as engine warms. some have small bleeder screw on the thermostat housing to air in bleeding air while filling. just crack it open until steady steam of coolant comes out. test drive and recheck coolant level. recheck coolant and adjust level for the first few days.

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4 Answers

White smoke from buick tailpipes, wont start


I had the same problem with my '87 Buick LeSabre 2 years ago. But it didn't seem to fit right, the car was running fine up until it just didn't. I had 3 professional mechanics swear it was a blown head gasket. I researched thoroughly and found out this particular engine make has a DEFECTIVE upper intake manifold which can break down and cause coolant to leak into oil, simulating a blown head gasket. The NHTSA had issued a recal on SEVERAL GM cars with this engine, EXCEPT for the '97. I filed a complaint with the ODI and as of today it is now COVERED as a "Defect & Recall". NHTSA ID number 96V116000. This MAY be your problem if it is NOT the "usual" blown head gasket. Hope this helps.

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2 Answers

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This is what they are talking about, a major problem for GM. Google it and you will see how big the problem is. Don't drive the car until you fix this.
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The 3.8-liter V6 may leak coolant into the engine from the intake manifold. A new gasket kit, revised throttle body nuts, and sealing compound is available.

Mar 10, 2009 | 2000 Buick LeSabre

2 Answers

Coolant dissappears with no visable leaks.


Yes...sort of the same...you are getting coolant in the motor...like a hairline crack in the head.

Mar 10, 2009 | 2000 Buick LeSabre

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