L36 Compression #'s ? - 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 02-10-2007, 10:54 PM   #1
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Default L36 Compression #'* ?

What are good compression figures? I just finished a UIM replacement with a APN unit and also replaced LIMgasket with the new GM one. I had a UIM failure.

I went to start it and it spins over but didn't fire. Pulled plugs and all were wet with Oil and water or gas. Did a compression check and the lowest was 90 and highest was 150. I think my head gaskets went out, or the heads are shot, are the engine is shot. At this point I don't know if I should pull the heads or swap the whole engine. I could get a wrecked '95 parts car for $300. The guy says it ran fine before the wreck.

What to do??????????
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Old 02-10-2007, 11:47 PM   #2
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You should be in the 140-160 range with no more than 10% between the highest and the lowest.

Personally I'd pull the heads rather than swapping the engine, It'* way easier.
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Old 02-11-2007, 01:39 AM   #3
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Default It Runs!

I cleaned the plugs stuck'm in and she started and runs fine. I don't have a stat or antifreeze in it reight now. I'm gonna put a stat in and watch the water level tomorow.
Good night
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