5.9 pcm - JeepForum.com
 
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post #1 of 7 Old 02-01-2013, 05:42 PM Thread Starter
MN59ZJ
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5.9 pcm

I'm having an issue that may be caused the PCM in my 5.9 ZJ. I'm simply wondering if I can yank the PCM from a 5.9 Durango or Dodge pickup at the u-pull lot & swap it into the ZJ to see if that solves my problem?

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post #2 of 7 Old 02-01-2013, 05:48 PM
T-nave
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I could be wrong on this but I believe the 5.9 is programmed differently. It may work but your not going to get the same performance. Now would be a good time to get a custom tuned pcm. The person that programs it may be able to check/fix problems with yours.

9er, 3.5 IRO lift + 3/4" spacers w/ adjustable trac bars and arms, 242 swap, 285/70/17 Duratracs and some other doo dads
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post #3 of 7 Old 02-01-2013, 06:01 PM Thread Starter
MN59ZJ
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Quote:
Originally Posted by T-nave
I could be wrong on this but I believe the 5.9 is programmed differently. It may work but your not going to get the same performance. Now would be a good time to get a custom tuned pcm. The person that programs it may be able to check/fix problems with yours.
It's a LONG story, but I have an SCT tuner & a recently rebuilt (& improved ;-) ) engine. The problem I'm having is likely either caused by a bad PCM, or an error with the tuner. As I've chased every other possibility down with no success. For now, I just want to pop in another PCM & see if the issue goes away.
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post #4 of 7 Old 02-01-2013, 06:20 PM
T-nave
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Cant you default back to original settings of your pcm? Then unhook your tuner?

9er, 3.5 IRO lift + 3/4" spacers w/ adjustable trac bars and arms, 242 swap, 285/70/17 Duratracs and some other doo dads
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post #5 of 7 Old 02-01-2013, 06:28 PM Thread Starter
MN59ZJ
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Quote:
Originally Posted by T-nave
Cant you default back to original settings of your pcm? Then unhook your tuner?
I have. The code pops up in stock mode too, which indicates the PCM, but the problem didn't occur until I started using the tuner, which seems odd, but might be a coincidence. I can get a Dodge 5.9 PCM for $18. so if I can throw that in & see what happens, I can either confirm or eliminate the PCM as the problem & go from there... That is if the Dodge unit will work for this purpose.
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post #6 of 7 Old 02-01-2013, 08:04 PM
newfieZJ
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post #7 of 7 Old 02-01-2013, 08:24 PM Thread Starter
MN59ZJ
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Location: Lakeville, MN
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Quote:
Originally Posted by newfieZJ
For 18 bucks , no harm trying . What code ?
Depends. The SCT. Has a built-in reader & gives P0140, but the Eqquis at O'Reilly's gives P0172. They are actually similar results, involving O2 sensors detecting a rich mix. Once I reset it, it runs fine on the next start up, I could drive til the tank is empty & it won't pop a code. But once I shut down, the next time I start it up, I get the code after 3-4 minutes, then it runs rich until I reset it.

It gets more complicated than that, but That's it in a nut shell.
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