My YJ developed a high idle and sounds like a diesel/tractor - JeepForum.com

 
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post #1 of 6 Old 10-07-2013, 04:17 PM Thread Starter
JWBooth
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1991 YJ Wrangler 
 
Join Date: May 2011
Location: Owensboro
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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.
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post #2 of 6 Old 10-07-2013, 05:00 PM
scraper
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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.
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post #3 of 6 Old 10-07-2013, 10:40 PM
Day215
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1992 YJ Wrangler 
 
Join Date: Dec 2011
Location: Elk Grove
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Ill place my money on a cracked exhaust manifold, especially if its the original.
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post #4 of 6 Old 10-07-2013, 11:00 PM
Anticanman
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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.

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post #5 of 6 Old 10-08-2013, 12:43 PM Thread Starter
JWBooth
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1991 YJ Wrangler 
 
Join Date: May 2011
Location: Owensboro
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**
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post #6 of 6 Old 10-08-2013, 11:51 PM
Day215
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1992 YJ Wrangler 
 
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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.
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