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Unread 05-22-2013, 01:11 AM   #1
demonz0
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1994 YJ Wrangler 
 
Join Date: Nov 2012
Location: London, Ontario
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High Idle problem

I recently did my exhaust system and since then I have a high idle. Runs around 1400 RPM at all times now when it ran at 700rpm idle before. The air box did come out to access the manifold flange.

Before than I also hydro locked my jeep but had fixed it.

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Unread 05-22-2013, 01:31 AM   #2
billybooster2
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sounds like vacuum leak somewhere...broken / cracked hose somewhere?
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Unread 05-22-2013, 06:17 AM   #3
102joe
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A bad T. P. S. will do that too , some time you can pull it off and clean it , and it will clear up . Although it is pretty likely you disturbed a vacuum line while working on the exhaust , like Billy said . you can spray carb cleaner around the lines to try and fide it .
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Unread 05-22-2013, 06:17 AM   #4
Que89YJ
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1989 YJ Wrangler 
 
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x2 with Billy vacuum leak. Use carb cleaner and spray around listening for any idle change.
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Unread 06-02-2013, 03:28 AM   #5
demonz0
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1994 YJ Wrangler 
 
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Haven't gotten around to looking but have noticed a few other things about it. It starts really rough and as the temperature of the engine goes up so does the idle. Change your opinions or not?

Also I just spray the carb cleaner along the lines and connections?
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Unread 06-02-2013, 07:03 AM   #6
102joe
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Vacuum leak , engine will run warmer with high idle . Spray carb cleaner around the suspicious hoses or any where air could be sneaking into the intake . When the cab cleaner goes in inted of air the engine will rev up .
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Unread 06-02-2013, 07:53 AM   #7
Que89YJ
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spray every place you have a vacuum line. the pvc hose, manifold, and brake booster especially.
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Unread 06-02-2013, 07:54 AM   #8
Que89YJ
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1989 YJ Wrangler 
 
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I bet your manifold since you just did the exhaust.
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Unread 06-02-2013, 10:52 AM   #9
tchoberg
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1987 YJ Wrangler 
 
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The problem will be no doubt be related to something you did when changing the manifold. ( the `whatever u touched last rule`). Vacuum leak is the prime suspect as was pointed out earlier, so get the carb cleaner and find it the easy way. By the way, an UNLIT propane torch works also.
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