Vacuum testing
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Elder User
Joined: Oct 2003
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From: Seattle
Vacuum testing
What is a good way to go about testing for vacuum leaks? At least on my engine (the 3.0 FI) it isn't readily apparent where the vacuum system really maps out like, it's very difficult to follow the flow of the lines, they are multiple sizes, there are splices in the lines themselves at some points, and overall there doesn't seem to be a really good way to open up the hood and check them.
What's a good methodology for doing a vacuum test?
The other thing I wanted to add is that the engine seems fully capable of compensating for vacuum leaks, so when testing for them, what indicators should you use? Engine performance can't be one of them, because as I said the engine seems to be able to compensate to some extent.
What's a good methodology for doing a vacuum test?
The other thing I wanted to add is that the engine seems fully capable of compensating for vacuum leaks, so when testing for them, what indicators should you use? Engine performance can't be one of them, because as I said the engine seems to be able to compensate to some extent.
Last edited by eigenvector; Aug 9, 2006 at 09:35 AM.
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Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
I use carb or brake clean, spray it around anywhere you suspect a possible leak, all vac lines and gaskets like intake gaskets. do this with the engine idling. if you hit a place that has a vac leak it will change the rpms for a second or two. Don't just cover the engine and don't do it when the engine is extremelly hot and keep it off the exhaust manifolds (both are flamable but I have never had a problem using this technique, not even once)
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