Has anyone looked into this: Intake & Gaskets TSB - Page 2 - 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 11-24-2004, 09:03 PM   #11
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Have the dealer try re-torqing the bolts first and rule out if its just a simple throttle body gasket.
sounds like we are all in for future problems.
Why doesn't someone make a metal upper intake.
Thay are sure to get rich!
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Old 11-25-2004, 02:33 AM   #12
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Thank you Karfreek, glad to see more information on the intake manifold nightmare.
Silver have you changed the lower intake manifold yet? The EGR tube sticking up from the stock lower manifold is inch OD and causes the upper plastic manifold to warp or burn through. In the new lower manifold the EGR tube is smaller, rumored to be 5/8 inch OD, so the tube is not against the plastic.
Do not know why GM did not use a smaller tube OD the the hole in the EGR is only .390 inch ID.
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Old 11-28-2004, 12:10 PM   #13
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Quote:
Originally Posted by Silver
Thanks very much for the info Jay.
Glad I could help and arm you with info to take to the dealer. 8k is unheard of for failure.

My B'ville is Supercharged but my wifes Grand Prix is N/A and I track intake failures all the time on the net. Hers is a 99 with the Delphi manifold and no failure yet, but any day Im waiting for her to tell me the coolant light came on. She is 500mi from 70k.

Jay
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Old 11-29-2004, 08:35 AM   #14
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Quote:
Originally Posted by karfreek
Quote:
Originally Posted by Silver
Thanks very much for the info Jay.
Glad I could help and arm you with info to take to the dealer. 8k is unheard of for failure.

My B'ville is Supercharged but my wifes Grand Prix is N/A and I track intake failures all the time on the net. Hers is a 99 with the Delphi manifold and no failure yet, but any day Im waiting for her to tell me the coolant light came on. She is 500mi from 70k.

Jay
Jay....

I did my UIM on my 99 at 77K this past summer. The original Delphi intake was 100% intact and looked brand new (except for some carbon build up near the throttle body). The really disappointing part were the lower intake gaskets. They were severely degraded. Even though the UIM may look OK, don't discount what'* undiscovered under that lower intake manifold.
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