replacing a pcm -
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post #1 of 2 Old 11-04-2014, 01:42 PM Thread Starter
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1998 ZJ 
Join Date: Jul 2010
Location: Wichita
Posts: 1,431
replacing a pcm

How hard is it to do? And anything I need to know before doing it? Also, what about junkyard pcms? Will any work or does it need to be specifically for my jeep? (Flashed and such)

1998 ZJ 4.0 work in progress/DD
'97 ZJ 4.0|3.5 RC|31" -SOLD
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post #2 of 2 Old 11-04-2014, 04:53 PM
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1997 ZJ 
Join Date: Dec 2008
Posts: 9,049
you'll need a 98 pcm from the same engine/drivetrain. jy PCM will not need to flashed. it's luck of the draw as to the reliability of the unit you pull.

IMO, I would go to Advance Auto online and try to order one to pick up in store using 50 dollars off code HUGE50... one year warranty.

disconnect battery, remove coolant reservoir, three screws, three connectors.

see the link below, read #1, especially the misdiagnosis part, before you call the PCM bad. it could save you some money

then clean the grounds.

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