Vacuum Leak? - Page 2 - 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 02-07-2006, 04:19 PM   #11
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Well I was gonna hook it up and check, but then I realized I'm not sure how to hook it up to test. An explanation or pics would be appreciated. Thanks for the help so far
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Old 02-07-2006, 04:28 PM   #12
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the gauge has some T fittings. Hook the gauge to one of the T'* and run a vac hose from the car through the rest of the fitting.
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Old 02-07-2006, 04:30 PM   #13
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OK, any vac hose in particular? Where are they anyways...sorry for my ignorance.
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Old 02-07-2006, 04:47 PM   #14
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You know the rubber hoses connected to that plastic tube that is hooked to the back of your intake. One of them will work well. however...there isn't a check valve there and once you turn the car off..you will lose vacuum.
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Old 02-07-2006, 05:04 PM   #15
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What kind of reading should I end up with?
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Old 02-07-2006, 05:46 PM   #16
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There is a hose coming out of the front of the throttle body that Ts off. I hooked it up to the mechanism hooked to that hose on the left. I'm guessing that wasn't right since it went right to 0 when I shut off the car, but whille idling it stayed level at 19.
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Old 02-07-2006, 06:39 PM   #17
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That'* a good hose..look for consistent readings when you have a helper turn the wheel and hit the brakes.
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Old 02-07-2006, 06:41 PM   #18
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Ok, I did some looking online and found a couple tests. I tested it with quick opening of the throttle and it dropped to like 4 and then went right up to 20-21. I did a steady acceleration and held it around 3000 RPMs and it dropped by about 1 and went up to 20-21. I applied the brakes and it went down a little bit a couple of times...only like 1 or 2. After playing with the brake a little it got really soft and went to the floor very easily.
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Old 02-07-2006, 06:43 PM   #19
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I will have a buddy help me tomorrow more with the brakes and wheel turning, it'* hard to do on my own. Plus these effects only seem to happen when I've been driving for awhile and/or low on gas. I will test again this weekend when I do get low on gas.
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Old 02-08-2006, 08:44 AM   #20
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I know what the problem is, the car finally decided to tell me, unfortunately it told me on the way to school today. My brakes decided they didn't like me. The brakes are real soft they work normal at first then give right in and you have to push to the floor to stop. They work a little better if you pump them. So needless to say I had to shift and pump the brakes in order to stop so I could get to school alive. Luckily I know the car well enough to know when to shift.
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