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Old May 27th, 2009, 11:47 PM   #1
jeeptjpaul
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Default '99 XJ vacuum leak. Suggestions?

Any tips for tracking down a vacuum leak on a '99 XJ 4.0L? The check engine light came on and the scan read "vacuum leak-bay 1". Is there a good way to find the leak, or just start searching? Thanks for any advice!
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Old May 27th, 2009, 11:51 PM   #2
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propane torch, unlit but opened...run the engine at idle, run the torch slowly across all suspect ares, and listen for the rpm to increase as the vacuum sucks the propane into the engine

I've heard of many people using brake cleaner, ether, etc. in a similar fashion, but I dont like the idea of sprying a flamable liquid on a hot engine, besdies the fact that it semms like it would be less accurite that way
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Old May 28th, 2009, 12:26 AM   #3
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i always use brake cleaner with awesome results. yota bills idea works good too but im to lazy to fing the propane torch and brake cleaner is on every bench in the shop
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Old May 28th, 2009, 06:06 AM   #4
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I always have a small torch around...great for lighting the bonfire, grill, small furry animals, wayward gypsy children, etc...
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Old May 28th, 2009, 09:24 AM   #5
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Thanks guys. The hunt begins!
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Old May 28th, 2009, 09:45 AM   #6
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So this should be intake side right? Just trying to narrow down the area I'm looking at.
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Old May 28th, 2009, 05:48 PM   #7
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does ur cruise control work? how about the heater controls do they switch from the vents to the floor i have noticed that they like to break a line under the batt at the cruise contol line.
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Old May 30th, 2009, 11:13 AM   #8
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Quote:
Originally Posted by GREASYHANDS View Post
does ur cruise control work? how about the heater controls do they switch from the vents to the floor i have noticed that they like to break a line under the batt at the cruise contol line.
I will check out the cruise control, been a bit since I tried it. The vents and everything work fine. The jeep runs fine while driving, but after idling a while runs rough. Also, if I stop at a red light, the tach dips down to about 500 rpm just as i come to the stop, and then levels out.
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Old May 30th, 2009, 08:28 PM   #9
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I have used the propane method with success.
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