Are you sure you have the right ECU?

I thought all 89's with the V6 had MD136477. Everyone I've come across had this ECU. I wonder if yours got swapped out by mistake and replaced with another ECu thinking it would be the same.

Is your rig running rough or is it now not starting? Can you provide symptoms?

Also I'd suggest running your VIN through ASA to veriffy the proper ECU number for your rig.

I have a few of the rare MD136477 - rare since it was used only this one year.

I may have the MD126339 as well. Will double check later this evening when I get home from work.

Jim