Vacuum Leak? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-06-2006, 08:51 AM   #1
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Default Vacuum Leak?

It seems I have narrowed my problem with my car more, I think it'* a vacuum leak. Sometimes when I brake hard it stalls, seems only when a little below a half tank or lower. That didn't leave me with much to go on. But over the weekend I was parking and when I park I always straighten out the wheels. When I did this I noticed the car acted the same as when I go to take off after braking hard. It didn't stall of course cause it was in park so the idle was higher. But the RPMs did drop a little and the voltage went down to battery. I revved it a little and it came right back out of it. So what do you guys think?
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Old 02-06-2006, 09:28 AM   #2
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I don't remember what your original problem is because you started a new thread, it is tougher to diagnose.

Suggest you add to your original thread and ask a mod to lock this one. That way all your info is in the same place. However..if you believe you have a vacuum leak, take a look at all your vacuum lines and replace them as necessary.
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Old 02-06-2006, 10:33 AM   #3
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Was it the "I'm stumped" thread by ShortyKustoms?
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Old 02-06-2006, 12:11 PM   #4
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A vacuum problem related to braking could be a leaking diaphragm in the power brake booster. I wonder if you could undo the big vacuum line to the power brake booster, and use a vacuum pump and gauge to determine whether the booster diaphragm will hold vacuum. Others may be able to confirm this for us.
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Old 02-06-2006, 12:44 PM   #5
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Well I never really did post much on it 'till now, I've been troubleshooting it myself. I told you all of my problems above. When I am below a half tank and stop hard, like from a high speed or on a big hill it stalls when I try to go again. Also I have recently noticed that it does similar things when I turn the wheel. Does the steering use vacuum in any way? It never stalls when I have my foot on the brake, only when I let off. As for the turning of the wheel, the car started revving like 200 RPMs higher to keep the car from dieing, but when I pushed the brake and turned the wheel it still did it. I have a vacuum tester and I am going to test it asap. Yes btw I did post on the I'm stumped post in an effort to assist and get assistence. In that one I did mention that my plugs were white, I thought I may be running lean, but that could be indicating a vacuum leak too.
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Old 02-06-2006, 01:14 PM   #6
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Quote:
Originally Posted by 96LeSabre
Well I never really did post much on it 'till now, I've been troubleshooting it myself. I told you all of my problems above. When I am below a half tank and stop hard, like from a high speed or on a big hill it stalls when I try to go again. Also I have recently noticed that it does similar things when I turn the wheel. Does the steering use vacuum in any way? It never stalls when I have my foot on the brake, only when I let off. As for the turning of the wheel, the car started revving like 200 RPMs higher to keep the car from dieing, but when I pushed the brake and turned the wheel it still did it. I have a vacuum tester and I am going to test it asap. Yes btw I did post on the I'm stumped post in an effort to assist and get assistence. In that one I did mention that my plugs were white, I thought I may be running lean, but that could be indicating a vacuum leak too.
You could check the brake booster effect by removing and plugging the big hose and then starting the motor and seeing if you get the same reaction when turning the wheel and releasing the brake.
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Old 02-06-2006, 06:58 PM   #7
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Well I coukld do that with the turning of the wheel, but it only does it releasing the brake after stopping hard...it has done it a couple times on easy stops but it won't do it if I'm stopped to begin with.
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Old 02-06-2006, 09:06 PM   #8
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Hook a vacuum gauge up and see if you are having issues. Or follow some of the possible steps above. Seems like the best way to start troubleshooting is to raise that hood and start checking things over.
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Old 02-06-2006, 09:48 PM   #9
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I have a vacuum gauge, I got the same one as ina post that I saw, I think it was your pic actually. I hook it up, start the car, let the vacuum build and then shut off the car? How long should I wait to watch it? I'm guessing I should test it hot and cold too? I think it makes a difference as to when the problem occurs.
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Old 02-06-2006, 10:41 PM   #10
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Yeah..probably was a pic of mine. Start it up..builds in seconds..then leave it or a few minutes. hours if you want.
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