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Old 07-03-2011, 06:36 PM   #1
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After buying OHHH so many new parts on my 1999 olds 88.. it was still running rough. A friend suggested replacing the plenum gasket, after examination revealed an air leak near one corner of the plenum. Ok, did that, but he forgot to replace the O rings.. so he RE-did that.. NOW it is blowing steam out the exhaust (I mean my radiator was full and now it is EMPTY) AND it has quite a bit of gas in the oil (it had some gas in the oil before the gasket change too). I DON'T want to do any further damage. Can someone please please give me some ideas to fix this before it gets any worse? Thanks in advance, Leah
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Old 07-03-2011, 06:38 PM   #2
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Your leaking coolant from the coolant passages in the UIM right by the EGR pipe. Plug the passages and you should be good.
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Old 07-03-2011, 06:40 PM   #3
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Can you tell me what the UIM is?
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Old 07-03-2011, 06:42 PM   #4
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nm, got it.. upper intake manifold, LOL
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Old 07-03-2011, 06:48 PM   #5
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You are correct. The fix is easy, sorry, don't have a write up on the fix. I tapped the coolant passages and put a 1/4" plug in, then removed the rubber gasket part of the gasket around the coolant passages and filled it with red RTV and put a nickel in place, and that sealed it right up.
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Old 07-04-2011, 11:45 AM   #6
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Thanks Dan, When the rain stops, we're gonna go try this again.
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Old 07-05-2011, 04:25 PM   #7
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Ok, I "THINK" he did what U said, & plugged the holes. But now the car won't start at all. I'm thinking it'* from all the antifreeze that got pumped through my motor & blew out my exhaust? He pulled the plugs out, dried & re-gapped them....still nothing.
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Old 07-05-2011, 04:34 PM   #8
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Replace the plugs, they don't like coolant fowling. Make sure there is a spark.
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