High Idle problem - JeepForum.com
 
LinkBack Thread Tools
post #1 of 9 Old 05-22-2013, 01:11 AM Thread Starter
demonz0
Registered User
1999 XJ Cherokee 
 
Join Date: Nov 2012
Location: London
Posts: 204
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.


99 Cherokee 4.0L | 5in Lift | 33x12.5
94 YJ 4.0L | 4in RC Lift | 32x11.5
98 TJ 2.5L | 31x10.5
demonz0 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 05-22-2013, 01:31 AM
billybooster2
Registered User
1983 CJ8 
 
Join Date: Jul 2008
Location: Cow Mountain
Posts: 1,122
sounds like vacuum leak somewhere...broken / cracked hose somewhere?
billybooster2 is offline  
post #3 of 9 Old 05-22-2013, 06:17 AM
102joe
Registered User
1993 YJ Wrangler 
 
Join Date: Sep 2008
Location: CastroValley
Posts: 521
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 .

REAL JEEPS HAVE LEAF SPRINGS

NO REALY ,, IT IS HIP TO BE SQUAIR
102joe is offline  
post #4 of 9 Old 05-22-2013, 06:17 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 20,800
x2 with Billy vacuum leak. Use carb cleaner and spray around listening for any idle change.
Que89YJ is offline  
post #5 of 9 Old 06-02-2013, 03:28 AM Thread Starter
demonz0
Registered User
1999 XJ Cherokee 
 
Join Date: Nov 2012
Location: London
Posts: 204
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?

99 Cherokee 4.0L | 5in Lift | 33x12.5
94 YJ 4.0L | 4in RC Lift | 32x11.5
98 TJ 2.5L | 31x10.5
demonz0 is offline  
post #6 of 9 Old 06-02-2013, 07:03 AM
102joe
Registered User
1993 YJ Wrangler 
 
Join Date: Sep 2008
Location: CastroValley
Posts: 521
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 .

REAL JEEPS HAVE LEAF SPRINGS

NO REALY ,, IT IS HIP TO BE SQUAIR
102joe is offline  
post #7 of 9 Old 06-02-2013, 07:53 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 20,800
spray every place you have a vacuum line. the pvc hose, manifold, and brake booster especially.
Que89YJ is offline  
post #8 of 9 Old 06-02-2013, 07:54 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 20,800
I bet your manifold since you just did the exhaust.
Que89YJ is offline  
post #9 of 9 Old 06-02-2013, 10:52 AM
tchoberg
Registered User
1987 YJ Wrangler 
 
Join Date: Sep 2011
Location: Winchester
Posts: 105
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.

If it ain't broke, don't fix it - Don't worry, something will break soon enough for you to fix.
tchoberg is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome