My YJ developed a high idle and sounds like a diesel/tractor - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > My YJ developed a high idle and sounds like a diesel/tractor

Building a Bumper?Ruffstuff Axle Simple Swap Kit!~Artec JK 1 TON SWAP~

Reply
Unread 10-07-2013, 03:17 PM   #1
JWBooth
Registered User
1991 YJ Wrangler 
 
Join Date: May 2011
Location: Owensboro, Kentucky
Posts: 131
My YJ developed a high idle and sounds like a diesel/tractor

Been wheeling pretty hard the last 2 Saturdays here in Western Kentucky (private land). I discovered my 10yr year old prissy cheerleader diva daughter (that's typically embarrassed to be seen with Daddy in his dirty old Jeep) LOVES going out wheeling!!! (Yes, I had to bribe her initially.) We turned 4 wheeler trails into Jeep trails, gotten to use my winch more than ever, climbed more hills, crossed more ditches and logs than ever, used my KC "offroad" lights actually off road, and know more about my Jeep than I ever have since owning it. I've had more fun in my Jeep these last 2 weeks than I ever thought possible.

BUT, I don't know is why I've suddenly developed a high idle. He's been idling right at 1500 RPM's and sounds like Pap's old 2240 John Deere tractor after starting up. It's a rough idle for about 30 seconds then smooths out and the idle stays at 1500. Runs fine, pulls fine, shifts fine, starts fine, not running hot... but something is noticeably different after this Saturday's outing. Maybe just time for a tune up? Plugs, wires, etc? Is there a sensor gone bad that could cause the problem? As always, I appreciate any feedback and input. Thanks in advance, JF.
-JDub

__________________
Please Note: My actual location is a lead box in Sassafras Cove.
-Proud Co-Founding Member of the Dirtbag Brotherhood
-Ringleader of the WhiteTrash Circus.
**LONG LIVE 4-LOW**LONG LIVE 4-LOW**LONG LIVE 4-LOW**
JWBooth is offline   Reply With Quote
Unread 10-07-2013, 04:00 PM   #2
scraper
Registered User
1995 YJ Wrangler 
 
Join Date: Jul 2013
Location: Minerva, Ohio
Posts: 202
First thing I would do is check the vacuum lines. Make sure they're all connected with no holes. The bouncing around may have knocked one loose.
scraper is offline   Reply With Quote
Unread 10-07-2013, 09:40 PM   #3
Day215
Registered User
1992 YJ Wrangler 
 
Join Date: Dec 2011
Location: Elk Grove, ca
Posts: 119
Ill place my money on a cracked exhaust manifold, especially if its the original.
Day215 is offline   Reply With Quote
Unread 10-07-2013, 10:00 PM   #4
Anticanman
Follow me
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Ripon, California
Posts: 19,223
Quote:
Originally Posted by Day215 View Post
Ill place my money on a cracked exhaust manifold, especially if its the original.
Exhaust leak and O2 compensation is something to look for.
__________________
Luck Favours The Prepared
[SIGPIC][/SIGPIC]
Anticanman is offline   Reply With Quote
Unread 10-08-2013, 11:43 AM   #5
JWBooth
Registered User
1991 YJ Wrangler 
 
Join Date: May 2011
Location: Owensboro, Kentucky
Posts: 131
Quote:
Originally Posted by Day215 View Post
Ill place my money on a cracked exhaust manifold, especially if its the original.
I'm sure it's original. Good place to start so I'll check it tonight. Think I've heard horror stories about replacing that d@mn thing and high probability of broken bolts associated with the task.

Get'n newer one part at a time!!!!
__________________
Please Note: My actual location is a lead box in Sassafras Cove.
-Proud Co-Founding Member of the Dirtbag Brotherhood
-Ringleader of the WhiteTrash Circus.
**LONG LIVE 4-LOW**LONG LIVE 4-LOW**LONG LIVE 4-LOW**
JWBooth is offline   Reply With Quote
Unread 10-08-2013, 10:51 PM   #6
Day215
Registered User
1992 YJ Wrangler 
 
Join Date: Dec 2011
Location: Elk Grove, ca
Posts: 119
I've done it on my 4.0......twice in a years time! While I wouldnt spend my free time doing it for fun, it wasn't too bad, just time consuming. Not sure how it works on the 2.5, but it shouldn't be too bad.
Day215 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.