coil on plug problem

[Dsmpagan]

hi. I'm swapping my coil on plug setup from my 90 to 91 talon. The connection plugs are different on the two cars. Ive attached pictures. not sure what to do. The plug from the coil on plug set up from the 90 talon has four wire and the plug from the 91 has only three wires. Not sure how to splice them together. Any help would be awesome.
Thanks.
Pagan

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[Dsmkauai]

What I used for my 91
Coil-on plug wiring
The black with white stripe wire (12Volt) on the dsm harness gets split into 2 wires, one going to the green on the intrepid #1 coil and the other to the green on the #3 coil. The white on the #1 intrepid plug goes to the Green on the #4, the white on the #3 goes to the green on the #2. The red galant wire goes to the white on the number 4 and the galant white goes to the white on the #2. Also the little black noise suppressor get tied to the Galant 12volt near the plug.

 

[GST with PSI]

You'll need to cut off the male 4 prong connector from your COP and replace it with a male 3 prong.

This thread outlines the process very clearly: http://www.dsmtuners.com/threads/coil-on-plug-wiring-and-install-with-pics.290665/

 

[Dsmpagan]

Hi still looking for some help on my coil on plug set up. Im going from a 90 to a 91. All the wire seem to line up to the new 3 wire plug from the old four wire plug except the yellow tach wire coming out of the tacho interface. I'm not sure what to. Any help would be awesome.

Thanks
John

 

[GST with PSI]

Why did you create another thread on the same topic, asking the same question? Your question was already answered in the other thread you posted.

http://www.dsmtuners.com/threads/coil-on-plug-problem.496169/#post-153537106


You can also look here:
http://www.dsmtuners.com/threads/cop-wiring-for-a-90-cop-came-from-a-91.469891/

And here:
http://www.dsmtuners.com/threads/cop-coil-on-plug-ignition-merged-1-8.166642/

You should post any additional questions in the thread you already created. I will have the mods merge this.

 

[mbyoung424]

Isn't the tach wire the white one? the blk/wht should be the ignition 12v, ylw/blk should be cylinders 2/3 and ylw/grn should be cylinders 1/4.

 

[mbyoung424]

http://www.dsmtuners.com/threads/1991-1994-ecu-swap-into-a-1990-dsm-ignition-wiring.302812/

This post also explains it.

 

[Dsmpagan]

I really tried, followed all steps but Im still left with the question of what to do with the yellow wire off the tacho interface. the problem I have with that think its a new coil on plug set up going to the plug off a 91 not a 90 to 91 conversion.

 

[GST with PSI]

You need to use a tach adapter to have a functional tach. I'm not aware of any other way to make the 90 tach work without an adapter unless you are using a CDI box or something other than the COP alone.

http://www.dsmtuners.com/threads/cop-wiring-for-a-90-cop-came-from-a-91.469891/

 

[Dsmpagan]

so I did a bunch of reading can I attach my tach wire from out of the tacho of interface to the number 5 pin of the 91 power transistor module?

And a different wiring for the 91+ Power Transistor Module

1=Yellow/Black Collector 1 (OC1) Coil B
2=Yellow/Red Base 1 (IB1) ECU pin 55
3=Black Ground
4=NC
5=White Tach Gate output ECU pin 109 and Gauge Cluster
6=Black/White +12 IG1
7=Yellow Base 2 (IB2) ECU pin 54
8=Yellow/Green Collector 2 (OC2) Coil A