Installed Refurbish PCM now engine cranks but no idle - JeepForum.com
 
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post #1 of 3 Old 05-04-2021, 03:50 PM Thread Starter
Andrae
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Installed Refurbish PCM now engine cranks but no idle

Hi there names Andrae I own a 2005 Jeep grand Cherokee WK 5.7l
Long story short me and my family wanted to go on a vacation drove from Utah to California San Francisco to be exact after arriving in San Francisco my jeep motor started to have a rough idle so out of panic I went to the nearest mechanic shop they scanned my vehicle and said there was a cylinder six misfire code The mechanic then told me it could be a Solenoid or pcm issue, so me being desperate I overnighted a refurbished PCM it arrive the next day mechanic installed PCM and did a throttlebody relearn now engine cranks but no idle.

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post #2 of 3 Old 05-04-2021, 04:34 PM
yzjwk
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Quote:
Originally Posted by Andrae View Post
Hi there names Andrae I own a 2005 Jeep grand Cherokee WK 5.7l
Long story short me and my family wanted to go on a vacation drove from Utah to California San Francisco to be exact after arriving in San Francisco my jeep motor started to have a rough idle so out of panic I went to the nearest mechanic shop they scanned my vehicle and said there was a cylinder six misfire code The mechanic then told me it could be a Solenoid or pcm issue, so me being desperate I overnighted a refurbished PCM it arrive the next day mechanic installed PCM and did a throttlebody relearn now engine cranks but no idle.
Hard to make a determination with this amount of info but I would say the odds of a sudden misfire being caused by a bad PCM are pretty slim. How much troubleshooting did the shop do ? Also, there’s a fair bit of “programming “ that needs to happen when you change the PCM not just a throttle body relearn.

You should be able to put the old PCM back and limp home with a misfire .. unless it’s an internal failure like a dropped valve or something . Then you’re SOL anyways.

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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post #3 of 3 Old 05-04-2021, 06:01 PM
Vertisce21
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Yeah, not sure why the shop would go straight to replacing the PCM. Could be a clogged injector, bad spark plug, timing chain issue...there's about half a dozen things I would check first before replacing the PCM starting with those three.
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