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#1
08-03-2008, 01:29 AM
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UIM gasket
Hi, I have a 1997 Grand Prix GTP (187,000 miles) that has a leaking UIM gasket and would like to replace the plenum and gasket. Does anyone know the part number I need and where to get it? Also, I have a Haynes repair manual to guide me but was wondering if there are any additional steps needed for the supercharged version of the engine. Thanks for any assistance you can provide.
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#2
08-03-2008, 04:55 AM
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Re: UIM gasket
Technically you do not have a UIM plenum like the N/A L36 3800 engines. Therefore you would be replacing the supercharger to LIM gasket and o-rings. All you have to do is remove the Eaton M90 supercharger. ZZPerformance has the gasket kits. How did you determine you have a problem with the supercharger gasket?
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
08-03-2008, 10:52 AM
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Re: UIM gasket
I recently had a chance to bring my vehicle in for the valve cover gasket recall. The dealership recommended replacing the Supercharger seal. I have noticed loss of coolant in the radiator but have yet to see any coolant dripping on the pavement. I also have noticed smoke coming from the engine compartment when coming to a stop on occasion.
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#4
08-03-2008, 07:22 PM
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Re: UIM gasket
How much loss of coolant? The supercharger gasket and the two o-rings for the coolant passages for the throttle body is a possibility. Leak sounds internal. Also, I would not rule out the lower intake manifold (LIM) gaskets. Better to replace all intake gaskets at the same time.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#5
08-04-2008, 04:01 PM
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Re: UIM gasket
I agree with Bob. The problem could also be the lower intake gasket, and I wouldn't do a supercharger mount or N/A upper plenum without doing the LIM gaskets while I'm in there.
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 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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