Need Series 2 Supercharged Vacuum Info (96+) - 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 08-07-2006, 08:11 PM   #1
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Default Need Series 2 Supercharged Vacuum Info (96+)

Hi all

Could someone with a series 2 sc motor please check their vacuum reading at the main distribution (main port is where the brake booster hooks up).

I think I've either got a leak or a cluster issue.

My reading is ~15in HG'*

Thanks

EDIT: per conversion my gauge is pretty accurate. Now..I've got a vacuum leak and can't seem to find it.

Have tried carb and TB cleaner
Checked EGR
Replaced a cracked EGR tube.
Double checked vac lines.

Only thing that I'm not sure of.. i replaced the EGR tube and nothing changed.. have sprayed liberally with tb cleaner and no change.. hmmm
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Old 08-07-2006, 08:52 PM   #2
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Ok.. unhooked all the vac lines including egr one at a time and plugged. No real change.
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Old 08-08-2006, 01:15 AM   #3
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Well, I just did mine. About 19.5 inHg at idle with nothing turned on in the car. It went down to 17 inHg with the A/C on full and rear defroster on for more alternator load.

I'm not sure how accurate my gauge is, but it seems close to what I remember my scanner and MAP sensor saying the pressures were.

Hope that helps.
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Old 08-08-2006, 08:18 AM   #4
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It does.. seems that I may just be paranoid.

Thanks/
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Old 08-08-2006, 08:42 PM   #5
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Does it idle good, or does it seem to run rough?

Is there a reason that you suspect you have a vacuum leak?
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Old 08-08-2006, 09:22 PM   #6
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He'* been chasing a lean bank code for a while. EGR tube was a recent find..I'm surprised that didn't help whatever the problem is, if there is a problem.
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Old 08-09-2006, 08:59 PM   #7
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Well, I assume then that he'* already cleaned/checked/replaced the MAF, right?
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