Vacuum Lines - 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 04-24-2007, 05:23 PM   #1
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Default Vacuum Lines

Hey guys/gals, I have a problem thats driving me nuts, going through all the other topics, and trust me, Ive went through a lot of them, I've noticed that you talk alot about vacuum lines. Now I have all the symptoms of a vacuum leak. How do I find it. I dont want to bring my car to a shop since they will charge me up the [email protected]@ to look it over. What are some of the ways to find this leak?? I have a 1993 bonneville SSEI! I am 99.9% sure my problem is a vacuum leak! Any help would be awesome!
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Old 04-24-2007, 05:59 PM   #2
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What is your car doing that makes you suspect vaccum leaks. We need all pertinent information
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Old 04-24-2007, 11:30 PM   #3
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Take some throttle body/carb cleaner and spray the crap out of the vacuum lines/fittings. If your engine RPMs change corresponding to the spray, you found the leak.
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Old 04-25-2007, 01:27 AM   #4
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would WD40 work??? The symptoms are a wierd idle, it goes up and down, up and down, and when I first start it, it wants to stall out, but doesnt if I give it some gas. There is also some play in my SC guage, so I think it might be a line to the SC
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Old 04-25-2007, 05:04 AM   #5
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no, use carb/intake cleaner. much thinner than WD40 so it'll be sucked into leaks faster and easier.

But as a preliminary judgement, that sounds like the MAF sensor, but umm yeah. do you have any SES codes?
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Old 04-25-2007, 08:57 AM   #6
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Quote:
Originally Posted by wjcollier07
no, use carb/intake cleaner. much thinner than WD40 so it'll be sucked into leaks faster and easier.

But as a preliminary judgement, that sounds like the MAF sensor, but umm yeah. do you have any SES codes?
throttle body not carb

throttle body cleaner is diffrent then carb cleaner
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Old 04-25-2007, 09:00 AM   #7
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CARB cleaner. It'* more combustible and enters the system BEHIND the critical sensors. You don't use much.

Not sure where Badnit got the TB cleaner idea.
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Old 04-25-2007, 09:13 AM   #8
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Start off by touching your vacuum lines. Replace any line that leaves black on your fingers. Then go from there. You may have many small leaks from old lines.
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Old 04-25-2007, 01:21 PM   #9
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No engine code is being set off!!
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Old 04-25-2007, 01:35 PM   #10
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Sallan, please click on the Profile link on the top menu bar, and add your year and model (trim level) to your signature. It'll help us help you.
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