PCM Replacement
#1
Junior Member
Thread Starter
Join Date: Aug 2016
Location: Santa Clara, CA
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
PCM Replacement
Hey guys,
It finally seems that replacing the computer on my '96 4.0 Manual Trans could be the fix it needs. I've looked into upgrading the computer and found out that they do not make them anymore, and have read that buying a rebuilt PCM from the dealer is the best way to go.
Before I do this, however, I have a mind to pull one off a junker first and try that. My mechanic says I can just pull one off and plug it right in to my Jeep without any reprogramming. Is it that easy? Any input is appreciated.
Will
It finally seems that replacing the computer on my '96 4.0 Manual Trans could be the fix it needs. I've looked into upgrading the computer and found out that they do not make them anymore, and have read that buying a rebuilt PCM from the dealer is the best way to go.
Before I do this, however, I have a mind to pull one off a junker first and try that. My mechanic says I can just pull one off and plug it right in to my Jeep without any reprogramming. Is it that easy? Any input is appreciated.
Will
#2
Senior Member
Yep it's that easy. Match year and driveline. car-part.com is basically a search engine for salvage yards, and they have several listings.
If it was a 97+ you'd also have to worry about the possibility of the sentry system, but I don't think that was an issue with the 96.
If it was a 97+ you'd also have to worry about the possibility of the sentry system, but I don't think that was an issue with the 96.
#3
CF Veteran
Join Date: Feb 2012
Location: Southern Oregon
Posts: 1,206
Likes: 0
Received 1 Like
on
1 Post
Year: 1990
Model: Cherokee
Engine: 4.0
Originally Posted by wgebb
Hey guys,
It finally seems that replacing the computer on my '96 4.0 Manual Trans could be the fix it needs. I've looked into upgrading the computer and found out that they do not make them anymore, and have read that buying a rebuilt PCM from the dealer is the best way to go.
Before I do this, however, I have a mind to pull one off a junker first and try that. My mechanic says I can just pull one off and plug it right in to my Jeep without any reprogramming. Is it that easy? Any input is appreciated.
Will
It finally seems that replacing the computer on my '96 4.0 Manual Trans could be the fix it needs. I've looked into upgrading the computer and found out that they do not make them anymore, and have read that buying a rebuilt PCM from the dealer is the best way to go.
Before I do this, however, I have a mind to pull one off a junker first and try that. My mechanic says I can just pull one off and plug it right in to my Jeep without any reprogramming. Is it that easy? Any input is appreciated.
Will
#4
Junior Member
Thread Starter
Join Date: Aug 2016
Location: Santa Clara, CA
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Update: Got a PCM from a junkyard and installed it, however my woes continue as the Jeep still powers down sometimes when it warms up.
Question: Today I flashed the PCM by touching my battery cables together for about a minute, and I know it takes about 50 warm up cycles for the computer to learn the correct settings. Has anyone ever noticed funky behavior during those initial cycles (like increased throttle on its own, the engine dying softly or sputtering out?)
I'm hoping the answer is that this is normal behavior, but I'm guessing it's a safe bet that the new PCM did not fix the underlying issue and its the same problem I've been having.
Question: Today I flashed the PCM by touching my battery cables together for about a minute, and I know it takes about 50 warm up cycles for the computer to learn the correct settings. Has anyone ever noticed funky behavior during those initial cycles (like increased throttle on its own, the engine dying softly or sputtering out?)
I'm hoping the answer is that this is normal behavior, but I'm guessing it's a safe bet that the new PCM did not fix the underlying issue and its the same problem I've been having.
#5
Senior Member
Join Date: Jul 2011
Location: West Covina, Ca.
Posts: 535
Likes: 0
Received 25 Likes
on
21 Posts
Year: 1988
Model: Cherokee
Engine: 4.0
Note from DJ
Jeep still powers down sometimes when it warms up.
That’s a very vague statement. Try explaining your problems with your Jeep in a little more detail with the hope that some on else has had the same problems and solved it.
Jeep still powers down sometimes when it warms up.
That’s a very vague statement. Try explaining your problems with your Jeep in a little more detail with the hope that some on else has had the same problems and solved it.
#6
Junior Member
Thread Starter
Join Date: Aug 2016
Location: Santa Clara, CA
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Thanks, will do in the future. I'm not seeking help for that particular problem here, just curious if anyone has flashed their PCM and noticed any strange behavior after doing so.
Thread
Thread Starter
Forum
Replies
Last Post
Lcc9117
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
09-01-2016 10:27 AM
aakkermans
Modified XJ Cherokee Tech
0
08-26-2016 04:57 AM
Boostwerks.com
Non-Cherokee Parts
0
08-22-2016 12:57 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)