Testing for vacuum leaks
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Elder User
Joined: Dec 2008
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From: Ocala
Testing for vacuum leaks
I ran a few searches and turned up nothing. I know you can start the truck and let it idle then run a small amount of propane (unburning of course) over the vacuum lines. If there is a leak the truck will pick up and run much better. Well I'm at home and dont feel like going to buy a handheld propane torch so is there something else that can be used? I have acetylene, but not sure if that will damage motor. Thanks
Post Fiend
Joined: Feb 2009
Posts: 8,773
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From: Texas Coast
Simple but effective. Use some flexable 3/8 to 1/4 inch tubing tie wrapped to a dowel rod. Move the dowel around and listen to the other end. Its harder to hear on a diesel but work well on a gasser.
Posting Guru
Joined: Nov 2001
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From: Ft Scott
That won't work on our trucks, the vacuum is created by a pump, the propane would just follow the line back to the pump and have no effect on rpm's
Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
Yep what Rodney said. Vacuum isn't created by the engine. No throttle plate to create it. A gauge and hand pump while isolating parts of the system is about the best way I can think of finding the leak.
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WB9PRG
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 5, 2003 10:30 PM
