Who wants more power out of their 87 or 88? - Page 3 - Jeep Cherokee Forum

Go Back  Jeep Cherokee Forum > Technical Discussion > MJ Comanche Tech. Stock & Modified.
Who wants more power out of their 87 or 88? >

Who wants more power out of their 87 or 88?

MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

Who wants more power out of their 87 or 88?

Old 04-22-2014, 03:55 PM
  #31  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

Originally Posted by 1arunem View Post
I know this is the Commanche section but am assuming this applies to Cherokees as well. I have an 88 and would love a bit more power.. I assume a Commanche ECU will work on a Cherokee?

I'll be scouring the local yard for a 89-90 ECU now! Thanks!
You're 100% correct.
cruiser54 is offline  
Old 04-22-2014, 10:04 PM
  #32  
CF Veteran
 
884x4's Avatar
 
Join Date: Feb 2013
Location: Justin, TEXAS
Posts: 1,794
Year: 1988
Model: Cherokee
Engine: 4.0
Default

Originally Posted by 1arunem View Post
I know this is the Commanche section but am assuming this applies to Cherokees as well. I have an 88 and would love a bit more power.. I assume a Commanche ECU will work on a Cherokee?

I'll be scouring the local yard for a 89-90 ECU now! Thanks!
Doesn't even have to be from a Comanche. Any xj, or mj 89-90ecu will work
884x4 is offline  
Old 04-23-2014, 02:40 PM
  #33  
Member
 
Join Date: Mar 2014
Location: Helena, Al.
Posts: 171
Year: 1988
Model: Cherokee
Engine: 4.0l
Default

Picked up an ECU out of a 1990 model today. Hope to install it soon and hopefully see some improvement in power.. Will report back...
1arunem is offline  
Old 04-23-2014, 04:55 PM
  #34  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

Originally Posted by 1arunem View Post
Picked up an ECU out of a 1990 model today. Hope to install it soon and hopefully see some improvement in power.. Will report back...
Whaddya give for it?
cruiser54 is offline  
Old 04-23-2014, 05:16 PM
  #35  
Member
 
Join Date: Mar 2014
Location: Helena, Al.
Posts: 171
Year: 1988
Model: Cherokee
Engine: 4.0l
Default

$32 + tax from local Pull A Part. Not sure if that is a great deal but thought it was fair.
1arunem is offline  
Old 04-23-2014, 06:18 PM
  #36  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

Originally Posted by 1arunem View Post
$32 + tax from local Pull A Part. Not sure if that is a great deal but thought it was fair.
Nothing wrong with that.
cruiser54 is offline  
Old 04-24-2014, 07:53 PM
  #37  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

This should help you guys when swapping ECUs: Leave it on the bracket.
Attached Thumbnails Who wants more power out of their 87 or 88?-renix-ecu-mounting.jpg  
cruiser54 is offline  
Old 04-25-2014, 04:02 PM
  #38  
Junior Member
 
RusNorthID's Avatar
 
Join Date: Feb 2014
Location: Hayden ID
Posts: 62
Year: 1992
Model: Cherokee
Engine: 4.0L
Default

Originally Posted by cruiser54 View Post
Cody reported back last evening on changing his TCU from the standard 87 model to an 89 model I had from a parts Jeep.

Better shift points with less lugging and definitely noticeable.

I knew they changed the TCU after 87 due to customer complaints, and 88 and later seem to work great. My wife's 88 shifts like my 90.
I will also back this. I just got done rummaging my parts abd found my spare tcu from my 90xj and put it in my 88mj theres a difference in highway driving with a more noticeable kickdown response but i didnt notice a big difference in city but i haven't put mire then 5 mi city since swap
RusNorthID is offline  
Old 04-25-2014, 05:54 PM
  #39  
Junior Member
 
RusNorthID's Avatar
 
Join Date: Feb 2014
Location: Hayden ID
Posts: 62
Year: 1992
Model: Cherokee
Engine: 4.0L
Default

Also i believe my mj is equipped with 87 electronics because i have the c101 my tcu had 87 in the part numbers and in the same location the 90 tcu had the numbers 90. I also looked at the parts numbers on my ecu it has 87 in the first few digits. Maybe a coincidence but i don't think so. I will be looking through ecu's tomorrow and I'll be checking this numbers so maybe we will have a sure fire way to id are ecu's
RusNorthID is offline  
Old 04-25-2014, 05:55 PM
  #40  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

We're thinking the 4 digit number is year and weak of the year.

9022 being the 22nd week of 1990.
cruiser54 is offline  
Old 04-25-2014, 06:14 PM
  #41  
Junior Member
 
RusNorthID's Avatar
 
Join Date: Feb 2014
Location: Hayden ID
Posts: 62
Year: 1992
Model: Cherokee
Engine: 4.0L
Default

Ok ya so my 88mj has a week47 of 87 ecu. Would it be safe to say the if you have c101 then you got the 87 ecu? I have a friend with a 88xj with c101 ill peek at his ecu when i get a chance
RusNorthID is offline  
Old 04-25-2014, 11:23 PM
  #42  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

Originally Posted by RusNorthID View Post
Ok ya so my 88mj has a week47 of 87 ecu. Would it be safe to say the if you have c101 then you got the 87 ecu? I have a friend with a 88xj with c101 ill peek at his ecu when i get a chance
87 and 88 had c101 and wimpy ECUs.
cruiser54 is offline  
Old 04-26-2014, 06:10 PM
  #43  
Member
 
Join Date: Mar 2014
Location: Helena, Al.
Posts: 171
Year: 1988
Model: Cherokee
Engine: 4.0l
Default

Just completed the swap from 88 to 90 ECU (marked 8942 so I'm assuming late 89).

For me UNDENIABLY MORE POWER!!

To be fair, since I got the 88 about a month or so ago, I thought it was either a bit down on power or just weak (only 177 or so hp). Pulling long hills was a chore and general accel was not wonderful (especially pulling my 16ft bass boat).

Now, there is a distinct difference in 0-60 accel and pulls up hills do not seem so difficult(have one major one in my neighborhood I gauged it by).

Not to mention, idle quality is noticeably better. Mine was not bad, but it is much smoother now. I was assuming I needed to clean my IAC previously.

That being said, perhaps my ECU was not up to peak performance so I may be seeing more than normal gains.

Your results may vary, however, I would recommend the swap to anyone with an 87 or 88.

Thanks Cruiser54!!!!
1arunem is offline  
Old 04-27-2014, 10:46 AM
  #44  
Member
 
Jeepcrazy5722's Avatar
 
Join Date: Jun 2010
Location: Spokane
Posts: 146
Year: 1988
Model: Cherokee
Engine: 4.0
Default

Cruiser would you suggest doing the C101 elimination before the ECU or will it be fine to do the new ECU first?
Jeepcrazy5722 is offline  
Old 04-27-2014, 10:51 AM
  #45  
::CF Moderator::
Thread Starter
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,367
Year: 1990
Model: Comanche
Engine: 4.0
Default

Originally Posted by Jeepcrazy5722 View Post
Cruiser would you suggest doing the C101 elimination before the ECU or will it be fine to do the new ECU first?
Doesn't matter. It would be fun to see what the C101 elimination does first...

We KNOW what the ECU will do.
cruiser54 is offline  

Thread Tools
Search this Thread
Quick Reply: Who wants more power out of their 87 or 88?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: