Vaccum leak question
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Vaccum leak question
1989. Auto trans, stock
Will a vacuum leak after the TB , cause the engine idle to rise or go lower?
If I do have leak, and additionally, will finding it with starting fluid cause idle to rise or lower.?
Will a vacuum leak after the TB , cause the engine idle to rise or go lower?
If I do have leak, and additionally, will finding it with starting fluid cause idle to rise or lower.?
Race Director
Joined: Oct 2008
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From: Lansing MI
Yes, and using starting fluid to find it is an excellent way to burn it to the ground. I suppose that's one way to solve the problem.
Race Director
Joined: Oct 2008
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From: Lansing MI
For what its worth; one of the best ways to find a vacuum leak is to take a propane torch and turn it on without lighting it, then move the tip around the suspected areas until you find the spot that makes the engine rev up. This is much safer than spraying carb cleaner or brake cleaner all over the place, and if self preservation is an instinct you possess then you will never, ever use starting fluid.
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Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
For what its worth; one of the best ways to find a vacuum leak is to take a propane torch and turn it on without lighting it, then move the tip around the suspected areas until you find the spot that makes the engine rev up. This is much safer than spraying carb cleaner or brake cleaner all over the place, and if self preservation is an instinct you possess then you will never, ever use starting fluid.
Thanks
Advanced
Joined: Jun 2013
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. The last time I used my homemade smoke machine with a rubbe glove over the throttle body with the MAF removed on my 89. I got smoke out on the passenger side at the side of the throttle body but could never identity where it was coming from. I don't know if this is normal or not and would be curious if you get the same?
Race Director
Joined: Oct 2011
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From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Hmm, wish I could tell you where the leak is coming from. I would look visually for bad vacuum lines. Maybe spraying water in that area will help you find it. If there is a leak, and you're using water to find it, the engine will run rough when you find the leak.
Racer
Joined: Sep 2011
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From: Riverside California
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX