UIM question - Page 3 - 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 10-03-2006, 12:40 PM   #21
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I Did clean up the throttlebody, but I couldn't get the IAC secsor off without stripping the screws.
I had a vaccum leak somewhere that would go away when I took the cover off the oil fill hole.
I took everything apart to check the intake manifold gasket to see if it had moved and reaplied the RTV, this time I didn't thouch the gasket as I was installing the manifold.
I rechecked the torque on all of the bolts.
I started up the car to get a little whine again, but the whine will go away under acceleration and the engine still races from the extra air.
Today I don't hear the whine but the engine still races.
should I try another gasket?
I bought this one at a NAPA store and it wasn't a fel pro?
Could the gasket be bad?
Should I have any oil on top of the intake manifold when I take off the UIM?

At least i'm getting better at taking the intake manifold off.
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Old 10-03-2006, 01:33 PM   #22
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You are missing an O-ring from your PCV valve.
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Old 10-03-2006, 02:03 PM   #23
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What i'm getting is more like a whistling sound. Is this air passing through a narrower EGR tube?
The sound goes away under acceleration.
Could It be the UIM gasket leaking?
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Old 10-03-2006, 02:04 PM   #24
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I pulled out the PC valve and there was an O ring, but I will check It again.
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Old 10-03-2006, 03:16 PM   #25
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If I recall on the L36, you need two. The whistling is a good indication.
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Old 10-03-2006, 03:19 PM   #26
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the new PCV valve has an O ring.
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Old 10-03-2006, 03:21 PM   #27
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How many? Check your old intake for the lower o-ring. It'* probably still in there. Someone with an L36 should double-check me on this, but there should be TWO if I recall correctly on the L36.
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Old 10-03-2006, 03:26 PM   #28
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I bought my UIM fron the Auto Parts Network, which is also in the Techinfo.
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Old 10-03-2006, 03:30 PM   #29
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Check your OLD manifold for an O-ring down inside the PCV housing. Your new intake source has nothing to do with this.
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Old 10-03-2006, 07:25 PM   #30
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Yep the series 2 has TWO rings:
Quote:
Originally Posted by bill buttermore
... On my '95 there are two o-rings. A big one under the cover and a smaller one that fits around the pvc valve body and seals the crankcase port that the valve slips into. If this lower seal is not made, excess vacuum will be applied from the intake manifold around the pcv valve body and into the crankcase. Make sure you have the correct pcv valve. The weight of the valve is calibrated for your engine, and the length needs to be correct to make the seal as I recall. The excess vacuum can indeed cause problems with the seals on the ends of the crankshaft. It sucks dirt into them, pulls them into a position they are not used to, and can cause them to fail.

Your car, I think, will have a MAP sensor on top of the cover, but the principle is the same, just make sure the valve body makes a good seal in the crankcase hole preventing vacuum from bypassing the valve.
http://www.bonnevilleclub.com/forum/...ic.php?t=42341

That'* a 1995 L36 engine - first year of the Series II found in N/A cars but your car should be the same. The ring might be black and could be hard to see.
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