I narrowed down my sucking noise.... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-04-2006, 12:05 AM   #1
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Default I narrowed down my sucking noise....

A few weeks back, I noticed a slight sucking sound that got louder with acceleration. I thought it was a leaky BCA but I talked to markviiisvt4 today and he said it may be the LIM gaskets since they ARE leaking oil, well sure as ****, i got the trusty sprayer out and sprayed down where the gaskets are, bubbling like crazy, and there is oil down there. He told me the gaskets were replaced by the dealer a while back and they may have overtightened them and cracked the plastic parts on the gaskets. So anyone reccommend anything to replace while i have it ripped apart?
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Old 07-04-2006, 03:08 PM   #2
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Bump ^^^^
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Old 07-05-2006, 05:59 PM   #3
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Replace the gaskets and do it right... Make absolutely sure that the sealing surfaces are very clean and totally free of oil...

And the end seals are install dry, but I have found that a light coat of Good high temp sensor safe silicone sealer on both sides of the endseals will give you years of dry service with no oil leaks...

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Old 07-05-2006, 07:33 PM   #4
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Got everything off but the LIM. How should I drain the coolant out of it?
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Old 07-05-2006, 09:27 PM   #5
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Quote:
Originally Posted by Bonneville94V688
Got everything off but the LIM. How should I drain the coolant out of it?
Use the petcock on the radiator to drain the coolant. You have to remove the splash shield first. Then, on the bottom of the radiator on the driver'* side you'll see a valve. Have a drain pan ready, then open that valve. The coolant will flow straight toward the ground.
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Old 07-05-2006, 09:39 PM   #6
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Already got it. I drained the LIM via the lower hose on the WP. Makes me mad to see what I found..... I pulled the TB off the SC and found that someone did not use the proper gasket and gooped gasket sealer on it. Needless to say, I found evidence that coolant was getting sucked into the engine very slowly. I also found that the SC had 2 bolts slightly loose.
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Old 07-05-2006, 09:46 PM   #7
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If you found that the coolant was getting sucked into the engine then you need to get the oil drained ASAP. Coolant will eat at the bearings and cause engine damage that will likely cause a complete failure.
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Old 07-05-2006, 09:49 PM   #8
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No sign of it in the oil at all. It was being sucked in the combustion chamber. It must have been VERY little cause there is the normal soot in there and no sign of coolant. Maybe it wasn't sucked in. I just didn't trust the fake-o gasket someone made.
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Old 07-06-2006, 09:32 AM   #9
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Good news...

You found an issue that was probably causing the problem. Get the lower intake off. Replace all the gaskets, cleaning all your surfaces very well (I like to use brake clean on a rag to get the last oils off...mechanic trick) reassemble with the right gaskets..and you'll be off and running in now time.

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Old 07-06-2006, 09:49 AM   #10
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Quote:
Originally Posted by BillBoost37
Good news...

You found an issue that was probably causing the problem. Get the lower intake off. Replace all the gaskets, cleaning all your surfaces very well (I like to use brake clean on a rag to get the last oils off...mechanic trick) reassemble with the right gaskets..and you'll be off and running in now time.

Better yet is starting fluid. It'* pure alcohol. Best solvent I've ever found. And cheap compared to other "cleaners". Talk about an old mechanic trick.
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