TJ 4.0 Stumble? - Page 4 - JeepForum.com

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post #46 of 48 Old 07-30-2013, 06:28 AM
jeeptjrn
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2005 TJ Wrangler 
 
Join Date: Jan 2012
Location: Flint
Posts: 86
I just replaced 02 sensor with no code and hasn't stumbled since

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post #47 of 48 Old 06-09-2014, 06:54 PM Thread Starter
bmxboy809
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1999 TJ Wrangler 
 
Join Date: May 2011
Location: Manitowoc
Posts: 91
ITS BACK!

Similar symptoms, it stutters on the highway or under heavy load. It has been steadily getting worse over the last few weeks, and now has gotten to the point I cant drive it to work. One new symptom is a P1391 trouble code.

So far I changed the CKP sensor and tested the TPS. New cap and rotor.

I pulled the Ignition pickup off the distributor and when I bend/roll the wires it sounds like they may be cracked, possible from heat? I am replacing the Pickup under warranty tomorrow.

also when I was looking around today, I noticed the ECM was pretty warm. I just got back from a 20 min highway ride from work but the ECM seemed exceptionally hot. Should I be concerned about this?

1999 Wrangler TJ 4.0 5spd -- 6" LA , 35" MTZ's , Ford 8.8 , 4.88 gears , SYE , Tom woods CV shaft
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post #48 of 48 Old 06-12-2014, 04:48 AM
Bville-Bud
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Join Date: Feb 2008
Location: Berryville Virginia
Posts: 117
Just a heads up, I had a 98 Cherokee with similar issues. Changed the front O2 sensor and fixed it.
http://www.jeepforum.com/forum/f11/c...n-cold-759038/
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4.0 , missfire , o2 sensor , stumble , surge

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