98 TJ rough idle Help! - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today



Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-18-2013, 08:53 PM
Thread Starter
  #1
Jeeper
 
DmnSlyr's Avatar
 
Join Date: Aug 2013
Posts: 73
DmnSlyr is on a distinguished road
98 TJ rough idle Help!

I own an 98 TJ 2.5L 4 cyl. When started, and is idling the rpms drop really low and sometimes kills the motor. We know there is a small exhaust leak somewhere (seafoam test). Any other ideas how to fix the idle? I leave for college in a week and I want to take it with me.
DmnSlyr is offline   Quote
Old 08-18-2013, 10:05 PM   #2
Jeeper
 
louczar's Avatar
 
Join Date: Aug 2013
Location: NB, TX
Posts: 178
louczar is on a distinguished road
How many miles on it? Has the throttle body been cleaned? I have read that a dirty throttle body (including a AIC). give it a shot...

http://www.wranglerforum.com/f5/very...dle-52192.html

__________________
Just because you have one doesn't mean you have to act like one :-)

2012 VW Jetta TDI (90+ mile commute round trip to work) DD
2002 Wrangler X (in my name and waiting for my son to move from permit to license)
louczar is offline   Quote
Old 08-19-2013, 02:31 PM
Thread Starter
  #3
Jeeper
 
DmnSlyr's Avatar
 
Join Date: Aug 2013
Posts: 73
DmnSlyr is on a distinguished road
It has like 140k miles and the throttle body has been cleaned but thanks for the link!
DmnSlyr is offline   Quote
 
Old 08-19-2013, 02:32 PM   #4
Jeeper
 
Notoriously_rob's Avatar
 
Join Date: Jun 2012
Posts: 845
Notoriously_rob is on a distinguished road
Cps. Try to replace it- helped my idle and cutting off issues..
Notoriously_rob is offline   Quote
Old 08-19-2013, 02:39 PM   #5
Commercial Member

5-Year WF Supporting Member
 
Big Sarge's Avatar
 
Join Date: Dec 2012
Location: Fort Drum NY
Posts: 5,790
Big Sarge is on a distinguished road
Before replacling the expensive CPS unplug the TPS (throttle position sensor) and see if the problem goes away. If it does then your problem is the TPS
__________________

CLICK THE LINK BELOW FOR MY CUSTOM POOL BALL SHIFT KNOBS

http://www.wranglerforum.com/f37/custom-camo-pool-ball-shifters-224388.html
_______
/l ,[____],
l---L -OlllllllO-
()_) ()_)--o-)_)
Big Sarge is offline   Quote
Old 08-19-2013, 02:41 PM   #6
Jeeper
 
Notoriously_rob's Avatar
 
Join Date: Jun 2012
Posts: 845
Notoriously_rob is on a distinguished road
True point- didmt think about that- cps is 89.00 so i would check that too
Notoriously_rob is offline   Quote
Old 08-19-2013, 03:47 PM
Thread Starter
  #7
Jeeper
 
DmnSlyr's Avatar
 
Join Date: Aug 2013
Posts: 73
DmnSlyr is on a distinguished road
Thanks guys. I will let you know how it goes
DmnSlyr is offline   Quote
Old 08-21-2013, 06:17 PM
Thread Starter
  #8
Jeeper
 
DmnSlyr's Avatar
 
Join Date: Aug 2013
Posts: 73
DmnSlyr is on a distinguished road
We replaced the TPS and it didn't really help. We think it is the IAC giving us problems. When unplugging it (the IAC) there is no change in rpms.
DmnSlyr is offline   Quote
Old 08-21-2013, 09:10 PM   #9
Jeeper
 
00jeeper00's Avatar
 
Join Date: May 2012
Location: New Zealand
Posts: 51
00jeeper00 is on a distinguished road
I just went through this very same situation and if I can throw my 2c in. I replaced the TPS with a non Mopar one - Problem still there. Switched it with a Mopar one - Porblem Gone. TPS exchange has to be genuine in my experience. See if you can grab one from a TJ or XJ thats original just to test the theory.
00jeeper00 is offline   Quote
Old 08-21-2013, 09:12 PM   #10
Jeeper
 
00jeeper00's Avatar
 
Join Date: May 2012
Location: New Zealand
Posts: 51
00jeeper00 is on a distinguished road
By the way - I found this out after replacing all my sensors up and downstream as well as my headers.... Better to start repairs at the cheaper end of the scale..

00jeeper00 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off





All times are GMT -5. The time now is 03:52 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner