420A 420a No fire on cylinder 1 and 4

[Brandons_ballin132]

I'll start by saying i have searched and without conclusive answers I felt to share my own situation.. in search of help...
I've done a 420a auto to manual and what I did was take a auto shell and take all my stuff from manual car (running vehicle) and put in the auto shell. mission accomplished with everything except I am only running on cylinder 2 and 3. 1 and 4 are not firing I've got new plugs and wires and also got a new distributor or coil pack, I should say I don't understand what's going on.... I also have removed tcm for auto tranny and have the manual ECU in the car. Everything worked good before the swap please help me

 

[Brandons_ballin132]

The 2 cars were a 98 Rs/MT (my totally fine running vehicle) and I bought a 97 Gs/AT to swap into. After doing the swap I have this problem.. ^^^

 

[dsmcrzy]

Did you swap the wire harnesses as well? The ecu pin outs are different between 97 and 98.

http://www.2gnt.com/index.php?d=ECU_Pinout

 

[Brandons_ballin132]

Okay that must be my problem thanks dude!! Is there a recommended fix besides swapping the whole harness

 

[Brandons_ballin132]

Also went to reading th pin outs seeing that brown wire activates cylinder 2&4 and black and blue activates 1&3 would this be right considering the 1&4 cylinder and the 2&3 cylinders each work off separate halfs of the coil?? Maybe a miss print?

 

[Brandons_ballin132]

So if I got a 1997 m/t ecu it would fix problem? or could I re wire something?

 

[Brandons_ballin132]

I had an idea can I just put the original automati ecu back in to see if that fixes it?

 

[dsmcrzy]

I think it's a miss print or the person labeled them as the firing order rather than cyl #. You can try the auto ecu to check that off the list, but I believe the auto ecu will throw a check engine light because the trans computer won't be there. Also the auto ecu rpm limit is around 500 rpms lower.

You could:
-Swap the harnesses
-Get a 98 manual ecu
-Or try moving the ignition pins to the correct 98 pin out.

 

[Brandons_ballin132]

Hey man thanks for all your advice and input means a lot!!! Got her running fairly well now using the auto ecu (fix it) I think after I finish up a few things I'll either try to move the pins in the plug or wither order the AFX 1997 computer, isn't this computer tuneable? I wanna build another 420a engine and turbo. Would this computer be ideal?

 

[Brandons_ballin132]

The AFX computer is from Howell

 

[dsmcrzy]

Don't waste any money on the afx ecu. The 420a ecu is not able to be tuned without expensive Chrysler hardware.

Your best bet is megasquirt for tuning.