vacum to valve to butterfly - 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 11-12-2002, 07:32 PM   #1
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what is it and why if I unhook it do I go from 2lbs of boost to 7lbs? is there somthing wrong with this :(
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Old 11-12-2002, 09:47 PM   #2
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Now this one is going to be VERY intresting ! Calling all 5 star members!!!
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Old 11-12-2002, 09:49 PM   #3
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Didn't read your signature ! If you really want help REMOVE THE IMPORT FROM THE FORUM!!!
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Old 11-13-2002, 12:22 AM   #4
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LMAO @ vze3r85p
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Old 11-13-2002, 01:10 AM   #5
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Ok...Sorry I'm late. If your maxima is faster than your bonneville, you have a serious problem. I need to know some things. First, what boost do you read at idle. Second, what is the max boost you've ever read. Third, was the car idling when you read 7 pounds of boost with the valve disconnected?
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Old 11-13-2002, 02:56 PM   #6
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the car reads -8 at idle and it reads about 6lbs at max
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Old 11-13-2002, 04:16 PM   #7
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I would hope the Maxima is faster then the bonne considering the Maxima has more hp and is lighter.
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Old 11-14-2002, 12:13 AM   #8
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Quote:
Originally Posted by DAVID94SSEI
the car reads -8 at idle and it reads about 6lbs at max
Your car should be -10 at idle, if you're idling at the proper RPM. It should reach 9 to 9.5 pounds of boost with a mildly modified intake this time of year with cold air. If your idle is fine, I'd be considering replacing the bypass valve. I'm still unclear on something. You stated earlier, that "when I unhook it, I go from 2 pounds of boost to 7". At what RPM level? Driving, or not? I need some specifics here to properly troublshoot this.
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Old 11-14-2002, 12:29 AM   #9
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It reads 6 to 7 at max rpm 5500 lower at lower rpms with vac on it it holds 2lbs through the rpms
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Old 11-14-2002, 12:35 AM   #10
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How many miles on the car? I'm thinking you have a dying SC (happens rarely) or a bad bypass valve. Anybody wanna back me up on this?

I don't have my book handy. I could probably tell you more later.

You're not getting near enough boost.
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