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Unread 10-03-2013, 07:48 AM   #1
Jrboarder27
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2000 WJ 
 
Join Date: Oct 2011
Location: Boulder, Colorado
Posts: 1,021
So I suspect that I have a vacuum leak on my 2000 4.7 and I plan on getting some propane to help find it. I have what I think are the common symptoms, ( power loss, and rough idling at times) and I can here hissing at times while driving and idling. the problem is I can't hear or find it when i pop the hood, can any one point me in a direction.

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Unread 10-03-2013, 08:38 AM   #2
grussell
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2001 WJ 
 
Join Date: May 2013
Location: Longmont, CO
Posts: 364
You could start by checking all of the vacuum lines coming out of the intake manifold and follow the vacuum hoses outward. I would bet that some of the hoses are dry and cracked, especially where thay mate up with a fitting or a T. On my 2001 I found several that were dry rotted and cracked on the end where they mounted on the fittings on the intake manifold.
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Unread 10-03-2013, 02:59 PM   #3
swkenobi
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2003 WJ 
 
Join Date: Jun 2009
Location: Colorado
Posts: 144
x2 on checking all the rubber vacuum lines coming out of the intake. There are several places that will be cracked, go to NAPA or whoever and the the 1/4 hose and replace all of them.
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