I can test the input voltage to the module but is there any way to know if the module is working properly? Or is the best thing to do just to swap the part?

The engine seems to sputter significantly.
- New wires and opti
- compression test at 180-185 psi
- fuel psi at 43

 

The ICM is just an amplifier that converts low voltage PCM pulses to a higher voltage & current pulse to the coil. Parts stores can test them, but the results can be a false positive unless the ICM is almost flat out dead. Problem is they are not testing them under actual load to a coil and engine heat conditions. ICMs tend to fail when hot, then work OK when cold. If you are 'sputtering" at all temps then get the ICM and coil tested, maybe you'll get lucky and one will show as bad.. Was the car sputtering prior to new Opti and wire installation ?

 

Thank you for the response. Yes, it was sputtering before. There was a cam swap with CC467. The opti and wires were replaced during the swap since 2 wires fell apart when they were removed. The opti was pretty worn and was due for a new install. The pin on the back of the cam lined up with the deep hole on the opti.

I can remove the ICM and coil. The coil should be no problem to check (but it won't be under load). There were 2 ground wires that connect to the opti that broke, so they were crimped and soldered onto new eyelets, then refastened. I am thinking to check those again when I remove the ICM and coil. They were pretty solid but maybe they aren't a good enough ground under load.

 

I had a no- start issue over a yr. ago.I took the icm to a local auto parts store & it tested ok.I then hooked up my old coil & car started right up!I then bought a jobber type coil & no problems since.The coil that died was a MSD8226& just under 2 yrs. old.

 

Thanks for the tip. I'll be checking the ICM and Coil tomorrow. Honestly, I hope that one of them is bad so I can stop searching.