I'm guessing we should reset the ecu when we put it in?

Hell no!! They're not resetable. They're dumber than a box of rocks once the key is off. Plug N play. Go drive it and smile. Then after that, post up your happy findings.

Curiosity has gotten the best of me and I'm off to the junkyard to see if this will work for the 4banger as well. With an '86 (TBI) I just need to find one older than '90, correct?

Interesting. I'm not as familiar with the 4 bangers.

90 with throttle body injection?

I pulled one from an '89 that I put in last night. Startup to a smooth idle is quicker and it idles better. Can't believe it worked. I'm interested to see the fuel savings in a few days. The '86 thru at least '89 had a single injector on top of the throttle body- not sure about '90.

You talking 4 cylinder?

Coulda swore it felt like my 89mj had more power then my 87mj but my ad said I was full crap. Guess I was right.so for my 87 what numbers do I look for in the upgraded one.manual 2wd metric ton.

Get an ECU out of any 89 or 90 4.0 equipped XJ or MJ since you have a manual trans.

Any numbers to look for if I don't know the yr of the xj/mj.

8953005428 or 8953005429 for sure.

Know how to decode a VIN?

Tried decoding my 87mj it came out right,then decoded my 89mj an it was way wrong said column shifter automatic,when it clearly was manual and interior was wrong also.

Just for year!!

10th digit:

H-87
J-88
K-89
L-90

Whoop De dooo bazel.What does it all meeeeean......

Thanks buddy

You bet.

Update on my neighbor's 87.

Put the volvo injectors in.

0 280 155 746.

What a pleasant upgrade!!

Quicker starts, better throttle response and a bit better MPG. And mind you, we did this for safety reasons as the original injectors can split and spray fuel on your hot engine. This 87 already ran great with a late model eCU and TCU and we weren't expecting much improvement. Nice.....