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Unread 02-07-2014, 10:07 AM   #1
greenjeep05
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Join Date: Feb 2014
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Auto shutdown

Got a 2005 wrangler rubicon went to get smoged and it failed then when I drove off it shut down. Got it home let it sit for a day then it started up an ran til it got to allmost normal operating tempture then started shutting down. So it runs fine until it warms up then it shuts down. I got 3 error codes for o2 sensors an miss fires . I replaced the o2 sensors and still fails so now I have ordered a PCM

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Unread 02-07-2014, 03:13 PM   #2
Red Rubicon
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2003 TJ Wrangler 
 
Join Date: Jun 2002
Location: Mt. Shasta, Ca
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Repair the cause of the miss fires or you will be replacing your converters.
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Unread 02-08-2014, 10:47 AM   #3
laybackman
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1995 YJ Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
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Quote:
Originally Posted by greenjeep05 View Post
Got a 2005 wrangler rubicon went to get smoged and it failed then when I drove off it shut down. Got it home let it sit for a day then it started up an ran til it got to allmost normal operating tempture then started shutting down. So it runs fine until it warms up then it shuts down. I got 3 error codes for o2 sensors an miss fires . I replaced the o2 sensors and still fails so now I have ordered a PCM
I do not think it is the PCM. It is most likely the crank sensor which provides one of the reference signals for timing and injector firing. Make sure there is no oil dripping into the sensor.

Get the Jeep to run poorly and then shut it off. Unplug the crank sensor and then plug it back in. See if that changes anything.

Buy an OEM crank sensor from the dealer!

http://www.jeepforum.com/forum/f9/cr...sensor-157018/
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Unread 02-15-2014, 10:25 PM   #4
greenjeep05
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Quote:
Originally Posted by greenjeep05
Got a 2005 wrangler rubicon went to get smoged and it failed then when I drove off it shut down. Got it home let it sit for a day then it started up an ran til it got to allmost normal operating tempture then started shutting down. So it runs fine until it warms up then it shuts down. I got 3 error codes for o2 sensors an miss fires . I replaced the o2 sensors and still fails so now I have ordered a PCM
Replaced the PCM drove 50 miles and the engine light came on an gave me error code P2098 - downstream fuel trim system to lean. Checked o2 sensors and tightened them really good ( they are new Bosch sensors) and had shop clear the code.
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Unread 02-16-2014, 06:20 AM   #5
laybackman
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Quote:
Originally Posted by greenjeep05 View Post
Replaced the PCM drove 50 miles and the engine light came on an gave me error code P2098 - downstream fuel trim system to lean. Checked o2 sensors and tightened them really good ( they are new Bosch sensors) and had shop clear the code.
It looks like my 'guesstimate' was wrong. I just hate throwing big money at a potential problem, unless all other options were at least considered and anything that could be eliminated by a test was tested.

Usually if the PCM fails the capacitors go bad. That prevents the engine from firing until you leave the key in the ON position long enough for them to recharge.

Do you still have the old PCM? If you do swap it back in just for the heck of it. I wonder if it was the PCM or possibly a loose PCM plug....but then again you may not want to know that!
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