ECU

[Comanchaholic]

OK I've had this problem that I thought was the fuel pump. Nope. I ran a jumper wire to the fuel pump and I could hear it run in the tank.Then ,with a lot of crankin and scratchin my head,I noticed that some times the fuel pump relay was not clicking when I turned the ignition switch.Thats when the fuel pump would not run.Duh :nuts: Then ,sometimes when I turned the key switch on,the relay would click and the pump would pump and the engine would start. :dunno: Now, I can't even get the relay to click at all,so of course, no crank :mad: I think I have a bad ECU because several weeks ago while going down the road,I pushed my clutch in to shift and the engine revved way up. I,at that time,thought my floor mat had gotten wedged under my gas pedal. This happened twice. Then throw in the fact that my idle control stopped working when my A/C was on,and I think I have a control problem :???: :mad: :ack: So,where can I get an ECU for an '86 2.5L TBI and whats it gonna set me back?

[UNL1MTD]

I got an ECU from an '89 2.5L sitting in my garage. If it comes down to you needing it, its yours for 15 shipped. I have no clue if this is your problem or not though. Shoot me a pm if you want it.

[87manche]

have you checked the start relay up front, it's that odd little metal box all the fusible links are atached to.

if it was shorted or otherwise wonky it could do some weird stuff.

 

Otherwise, I'd jumper the relays to get power where it needed to go and try to start it.

[HOrnbrod]

OK I've had this problem that I thought was the fuel pump. Nope. I ran a jumper wire to the fuel pump and I could hear it run in the tank.Then ,with a lot of crankin and scratchin my head,I noticed that some times the fuel pump relay was not clicking when I turned the ignition switch.Thats when the fuel pump would not run.Duh :nuts: Then ,sometimes when I turned the key switch on,the relay would click and the pump would pump and the engine would start. :dunno: Now, I can't even get the relay to click at all,so of course, no crank :mad: I think I have a bad ECU because several weeks ago while going down the road,I pushed my clutch in to shift and the engine revved way up. I,at that time,thought my floor mat had gotten wedged under my gas pedal. This happened twice. Then throw in the fact that my idle control stopped working when my A/C was on,and I think I have a control problem :???: :mad: :ack: So,where can I get an ECU for an '86 2.5L TBI and whats it gonna set me back?

 

I have a brand new old stock 2.5L ECU listed on Ebay now that will fit your rig. Do a search for:

 

NOS JeeP Engine Control Unit ECU Microprocessor 2.5L

[Comanchaholic]

You're right 87manche, I've got three more test to do tomorrow.I need to jump the negative wire(the small orange/black one) from the ECU to the relay to determine if it is a bad wire/connection somewhere, and if not,I need to check and clean the connection into/out of the ECU. All I did to the odd little metal box that you're talking about was to tap it with my screwdriver a few times to see if anything happened. I will check that a little more thouroughly too. I'll write back Thursday with my findings. Thanks :cheers: