Vacume leak detection (how can I do it) -
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Go Back > Models > Jeep Cherokee & Comanche Forums > MJ Comanche Technical Forum > Vacume leak detection (how can I do it)

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Unread 03-07-2008, 12:56 PM   #1
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1999 WJ 
Join Date: Sep 2004
Location: Des Moines , Iowa
Posts: 53
Vacume leak detection (how can I do it)

I was wondering if there is a good way to track down a vacume leak. I've heard that you can use starter fluid to spray lightly around the hoses and if the idle goes up there may be a vacume leak. Does anyone have any other sugestions about how to do this . I am having a little problem with a slightly higher idle than what I think is normal. It is running around 12-1500 even after it warms up . I have swaped the IAC with a Junk yard one and that the next day later made it worse then I swapped it back and it brought it back down to 12-1500 . I havent tried the TB cleaner yet but may do that soon .

Addicted to Jeeps , had 1994 YJ, &1994 XJ, Have now 1997 XJ, 1996 XJ, &my project 1989 MJ, just bought another 89 MJ with a 4 cyl.
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Unread 03-07-2008, 04:25 PM   #2
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1989 MJ Comanche 
Join Date: Nov 2007
Location: Rhode Island
Posts: 277
You can buy new lines from napa. There are two main pieces for $20 each. And then the small fitting and line that comes off the back of the valve cover is about $10. These are the part #s
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Unread 03-14-2008, 12:34 AM   #3
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1984 J-Series Truck 
Join Date: Nov 2004
Posts: 3,211
too much ether can melt the pistons!
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Unread 03-19-2008, 04:19 PM   #4
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2000 WJ 
Join Date: Feb 2006
Location: Marietta,Ga
Posts: 112
First turn ur jeep on then take a propane tourch and turn the gas on, dont light it. Just pass the tourch over all of the vacum lines. When you hear the engine rev that is where your leak will be.
Hope this helps
2000 WJ stock

1992 Jeep Cherokee, 4.5in Rough Country lift, Bushwacker Fender Flares, Homemade Bumpers Front and Rear, 33x12.50 TSL's, Flowmaster 40 Series Muffler.
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