MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

Very high idle

Old 09-23-2018, 01:22 PM
  #1  
Newbie
Thread Starter
 
Join Date: Dec 2017
Posts: 10
Model: Cherokee(SJ)
Default Very high idle

I got a 87 Jeep Comanche base 4.0 when it's cold it will idle fine but when it warms up the idle goes 2000 to 3000 rpm if I hit the gas it might drop dowm to about 1500 but as soon as I take off it zooms right back up I cleaned and replace throttle body new t.p.s 02 sensor bout ayear old upgraded to a 428 e.c.u I installed one hole injectors from 89 xj checked vacuum lines but can't figure this thing out it takes bout 3 or 4 seconds to start but it always been that way my diagnostic machine says it's running rich and don't change could it be the o2 sensor not working
k-ro958 is offline  
Old 01-21-2019, 02:52 PM
  #2  
CF Veteran
 
SatiricalHen's Avatar
 
Join Date: Oct 2013
Location: Greenville, SC
Posts: 5,324
Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Default

Did you find a solution to this?
SatiricalHen is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Cyriac
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
15
03-12-2016 10:32 PM
Lou1326
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
02-03-2014 04:57 AM
keeblerkesler
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
12-06-2013 05:44 AM
DeepSky
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
09-28-2012 05:22 PM
mudallday
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
05-08-2009 06:52 PM

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

Thread Tools
Search this Thread
Quick Reply: Very high idle


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: