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Discussion Starter #1
I recently bought a CB GSR and it's only running on 2 cylinders (cylinder 1 and 4). I checked for spark and it seemed as if the 2nd coil pack had died. I replaced the coil packs and the same coil pack wont give any spark. I've checked through the wiring and it all seems fine (the car is original with nothing after market). I checked the CAS (cam angle sensor) and that appears to be working fine so I'm left thinking that either my ECU or ICM (igition control module) is dead (my tacho also doesn't read correctly). I opened up my ecu and the 2 large capacitors in the group of 3 have been replaced at some point with smaller ones and the solder job is horrific. I have a spare ECU on it's way and I'll be picking up a new ICM next week (bloody bills sucked all my money and what was left bought new coil packs). I am in need of some opinions on what else I can check while I wait for pay day to roll back round.
 

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My first suggestion is already too late... before buying a full new set of coil packs I would have swapped them around, put the known good coil packs where the suspected bad ones were etc and see if the problem moves with the coil packs.

The other thing to maybe look at is see if you can borrow a clamp on amp meter... should be able to read if power is even making it to the coil packs.

Also did you check the plugs themselves?
 

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Discussion Starter #3
I used my led test light (single led until I buy a twin one) and checked the 3 pin plug for the coils. I'm obviously getting power and the 2 signal wires are showing a signal. When I followed the wires the power wire goes into the loom with the wire for the first coil pack (the one that's giving spark) where as the number 2 pack that isn't giving me any spark goes to the icm which I find odd but it's all original. I'm left wondering why both the signal wires don't go to the same place but I'm sure the Mitsubishi techs that set it all up knew what they were doing.
 

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Discussion Starter #6
Don't worry I figured it out and swapped it for a known working one. Also found a diagram that shows timing marks and they are spot on so the last thing it can be is the ICM or wiring. The wiring looks fine but I haven't unwrapped it to check. I also did a compression test and it looks good. 1 is 208psi 2 is 209psi 3 is 210 and 4 is 205.
 

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Discussion Starter #7
I replaced the icm and it's now running on all 4. After checking a few other bits I took it for a run and it is sweet.
 
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