Modified XJ Cherokee Tech XJ (84-01)
All modified tech questions. If it modifies your XJ beyond stock parts ask it here.

High idle with 99+ manifold

Old 10-08-2012, 10:13 PM
  #16  
CF Veteran
 
Thexjfiles's Avatar
 
Join Date: Nov 2008
Location: Stokesdale, NC
Posts: 1,350
Year: 89XJ,96ZJ,98ZJ,72K10
Model: Cherokee
Engine: 4.0
Default

I would clean the TB very well, (take it off to do a good job) clean the IAC, (be careful they are fragile), and if that does not work....swap with a known good TPS.
Thexjfiles is offline  
Old 10-09-2012, 01:02 AM
  #17  
Member
Thread Starter
 
Erik Hoeffner's Avatar
 
Join Date: Feb 2011
Location: Parker Colorado
Posts: 160
Year: 1991
Model: Cherokee
Engine: 4.0 I-6 H.O.
Default

Originally Posted by stang65 View Post
have you adjusted the idle screw. I had to on my throttle body after installing it.
How do you go about that? I just tightened both back up to the throttle body firmly...
Erik Hoeffner is offline  
Old 10-09-2012, 01:04 AM
  #18  
Member
Thread Starter
 
Erik Hoeffner's Avatar
 
Join Date: Feb 2011
Location: Parker Colorado
Posts: 160
Year: 1991
Model: Cherokee
Engine: 4.0 I-6 H.O.
Default

Originally Posted by Thexjfiles View Post
I would clean the TB very well, (take it off to do a good job) clean the IAC, (be careful they are fragile), and if that does not work....swap with a known good TPS.

The throttle body is clean, the IAC should be clean as well, I cleaned them fairly well when they were removed from the previous manifold; maybe I cleaned them too much, to where it messed the IAC up a bit?
Mostly just throttle body cleaner and a toothbrush though.
Erik Hoeffner is offline  
Old 10-09-2012, 03:20 PM
  #19  
CF Veteran
 
stang65's Avatar
 
Join Date: Aug 2012
Location: oregon
Posts: 1,592
Year: 1993
Model: Cherokee
Engine: 4.0 ho 99 intake ps pump 1" tb spacer 62mm bored tb eletric fans and more
Default

theres a allen headed screw on the base of the throttle body that may need backed off to let the throttle blade seal correctly
stang65 is offline  
Old 10-09-2012, 07:02 PM
  #20  
Member
Thread Starter
 
Erik Hoeffner's Avatar
 
Join Date: Feb 2011
Location: Parker Colorado
Posts: 160
Year: 1991
Model: Cherokee
Engine: 4.0 I-6 H.O.
Default

Originally Posted by stang65
theres a allen headed screw on the base of the throttle body that may need backed off to let the throttle blade seal correctly
Not the screws that mount the TB to the manifold, you mean the ones actually on the sensor?
And how do u mean "backed off" like loosened a bit?
Erik Hoeffner is offline  
Old 10-09-2012, 07:13 PM
  #21  
CF Veteran
 
stang65's Avatar
 
Join Date: Aug 2012
Location: oregon
Posts: 1,592
Year: 1993
Model: Cherokee
Engine: 4.0 ho 99 intake ps pump 1" tb spacer 62mm bored tb eletric fans and more
Default

it should be on the out side of the throttle boddy where the throttle linkage hooks up. basically what the linkage comes to rest on.
stang65 is offline  
Old 10-14-2012, 03:29 PM
  #22  
Member
Thread Starter
 
Erik Hoeffner's Avatar
 
Join Date: Feb 2011
Location: Parker Colorado
Posts: 160
Year: 1991
Model: Cherokee
Engine: 4.0 I-6 H.O.
Default

Originally Posted by stang65 View Post
it should be on the out side of the throttle boddy where the throttle linkage hooks up. basically what the linkage comes to rest on.
Well yeah, messed with all that, no changes...except it shifts a bit better (by a pinch) unseated and reseated both the TPS and IAC. I'm not sure what else now, unless the IAC is bad.

Last edited by Erik Hoeffner; 10-15-2012 at 01:02 PM.
Erik Hoeffner is offline  
Old 10-28-2015, 10:53 PM
  #23  
Member
Thread Starter
 
Erik Hoeffner's Avatar
 
Join Date: Feb 2011
Location: Parker Colorado
Posts: 160
Year: 1991
Model: Cherokee
Engine: 4.0 I-6 H.O.
Default

Solved: CCV vent hose diameter was too large letting an excess of vacuum vent to the crank.
Erik Hoeffner is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Calikingcrawler
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
4
04-30-2017 11:14 PM
Jamesmon4
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
1
08-16-2016 09:04 PM
Tcq192
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
10-23-2015 09:25 AM
Programbo
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
21
09-26-2015 11:32 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: High idle with 99+ manifold


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: