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.

low vac

Old 10-02-2005, 03:47 AM
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well i was talking in chat and found that i have low vac imagin that with 13 mpg lol any how this is where the vac is at at idel
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anny thoughts or hints allreddy did all the vac lines except the one for the map
Old 10-02-2005, 11:02 AM
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Not out of the normal range at all. It can be temperature or moisture (rain and fog) dependent.

It CAN be a slight vacuum leak, but not normally.
Old 10-02-2005, 11:10 AM
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Having played with my SC a bit lately.. here'* some items I found (on 97)

Charcoal (evap) canister has a metal line follow it over the SC inlet to a connection piece of vac line.
The TB has a large vac connector for canister purge going into it.
Under the air box there are two lines going to the charcoal canister.
At the evap purge soleniod (92-95 on canister) (96-99) on back valve cover area.

My vac will flutter w/ac on or a little on startup idle but otherwise drops to -10 on both cars 95 and 97
Old 10-02-2005, 04:54 PM
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well all lines are good that is the first thing i went through on the car even befor i filed it up for the first time lol
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