raviann Upper Intake Failure - 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 01-02-2007, 08:53 AM   #1
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Default raviann Upper Intake Failure

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Originally Posted by raviaan
have the same problem with a 98 bonneville.... I punched the gas on the freeway to pass someone, all of a sudden my check engine light was flashing, and I had a little rough running. I got the car home and shut it off, and it would not start after that. I pulled the plugs and they had coolant on them. I pulled all the plugs, cranked it, and coolant came out. I removed the intakes, and the upper intake (top of lower) was an inch deep in coolant. The lower intake manifold gaskets were cracked up a little. I replaced all the gasked, replace plugs and wires, and reassembled. The car took a little to crank over, but ran for about 15 mins, and started displaying problems again, so I shut it off. The car would not start again. I pulled the upper intake again and there is coolant in there. I did not notice and cracks or anything, and was very throrough about checking everything... any ideas?

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raviann, you should get the oil drained right away. As well the upper intake will have failed inside the EGR passage area.

Please read this Techinfo article to bring yourself up to speed on the true problem. http://www.bonnevilleclub.com/forum/...e=article&k=38

You will want to get a new upper intake manifold and possibly change the stovepipe diameter depending if it has ever been done.
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