Help! Manual M5OD Swap

[Flip4ford]

New M5od in.. but it is throwing codes and running like poop. Missing, and not idling very well.

Truck is a 94. M5od, manual harness and manual ecu are out of 92-- Could that my problem?

There where a couple of differences in wiring harness, (no evap purge cylinder wires for one).

Can anyone help I am planning on a trip to CO in fist part of August.

 

[gmanpaint]

Try throwing the 94 ECU back in and see what happens. Try to find a 94 manual ECU in the meantime.

94 has EGR, 92 did not. I would think it will run better with the 94 Comp in it but you might get a CEL because of the manual trans.

Let us know how it worked out please.

 

[Turdle]

ok
92 has batch fire injection--if you look at the injector harness you will see the right and left bank injectors are wired in "parallel" bank to bank. right banl injectors are wired together, left bank wired together. Kind of like 3 speakers being wired to one output channel of a stereo.

your 94 has sequential fire injection-using dedicated wiring to each injector. This setup is more like a surround sound setup. Individual wiring to each speaker with an output on the amp for each.

So, the 92 ecm has only 2 fuel injector signal outputs-the 94 has 6.


also
92 has no cam sensor wired in, 94 does. The Crank sensor signal is in series with the cam sensor--so you will not be able to bypass this

92 has no egr, as mentioned earlier.
92 has only one 02 sensor, your 94 has 2, one on each bank.


You really need a 94 manual ECM and your original 94 wire harness to make it all work out.

lower year will just not work for you.


Edit---unless---
if you find the correct engine harness--it might work. However, you will need to change the whole ecm harnes, and underhood harness. This includes the power distribution box.


it would be a lot simpler to keep the egr and find a 94 ecm for manual trans.

Edit 2-
A "Late" 93 california emissions ECM would have the same config as the 94 . Be sure it is the late 93 with cam sensor-EGR- and 2 02 sensors

 

[Flip4ford]

AWW Poop that is what I was afraid of. Thanks Turdle! Will I need a 94 manual trans wiring harness as well? I already have the other one Anyone have a 94 manual ecm?

 

[gmanpaint]

it would be a lot simpler to keep the egr and find a 94 ecm for manual trans.

LOL...yeah.

 

[Happy Jack]

http://www.car-part.com/cgi-bin/sea...7.3629&userUID=0&userBroker=&userPage=1&iKey=

Oklahoma, topeka, and dodge city.

 

[Happy Jack]

Course I could let you borrow mine and you could see if Elvis runs warm like Green does.

 

[Maniak]

Worst case, if you need to drive it now, throw the 94 auto ECM back in. Then take the shift solenoids out of the a4ld and wire them into the harness that used to connect to them anyway. Then Zip tie the solenoids to the wire harness and the CEL caused by the missing solenoids will go away.

Another option is to wire in 33 ohm resistors into the trans harness in place of the solenoids. Thats all the ECM is looking for, the 25-40 ohm solenoids (3/4 and tcc). That how I have our set. One of the resistors did burn over time (used a 1/4 watt one) and I still don't get a Cel but I do get a CM code which I actually like. Now I know when I'm reading the codes right since I know that one code will always be there.

~Mark

 

[Flip4ford]

Well I put the Auto computer back in-- with the manual wiring harness from the 91-- Seems to be running great-- no cel -- no thrown codes.. Everything is ship shape? I moved no solinoids, and it drives fine. Hmmmm? I will still be looking for a 94 manual ecm, because if nothing else I would like a rev limiter (not an option on the auto ecm)

PS Doubler is working great too!!

 

[Happy Jack]

Ya but you didn't change the whole harness did ya. Just the tranny harness. So that may work. Like I said ya kin barrie mine for the trip if ya need. I'll need it back though. Goes in ta the shop next tuesday but should be out afore ya leave next friday.

 

[Flip4ford]

Jack I'll talk to you on Saturday

I Have a very few Pics http://www.facebook.com/?ref=home#!/album.php?aid=2052359&id=1180183434