It could indicate corrosion on the ground lug. But if you look at the voltage loss on the black wire in your photo, it's in the 1/100ths of a volt. Of course that's at no load, since the connector is unplugged. Never hurts to clean the grounds up.

 

The black wire should be no resistance to ground. Check your meter by touching the leads together to see if it reads zero resistance when on the ohms scale.

 

It does =) just checked my meter before I attempted to ohm the coil..


I thought those #'s looked high but what do i know?!?

Should I re-bond the black wire to ground to improve the connection ?



Thanks to all for the assist!

 

ICM tested a FAIL at O'Reilly autoparts so I purchased a new one. Is there something upstream that took out the ICM so i should be hesitant to just replace it?

 

My icm failed out of nowhere but the car would start and run fine. It would just blow my ignition fuse over and over.

I have replaced the ICM and it hasn't given me a problem.

 

replaced the ICM and I have FIRE!!
still sounds like she has a miss time for a rescan now that she runs again!



THANKS TO ALL WHO CONTRIBUTED!

I also cleaned up the ICM ground and now have .70 ohms of resistance from the pin of the black wire to the engine groundstraps.

 

I had one also after doing some diagnostics.
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Just by luck I pulled the battery to put it in another car for an hour and when I put it back in the Z28, the misfire/flutter was gone.

 

Yes I ment to say pull the high voltage wire that goes from the coil to the opti.