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Originally Posted by rbm11761
91 Olds 98 started running rough, 1st place i checked was the coil put my timing light on each wire just to see if I had spark, I was right the middle coil was not putting out any spark at all each coil ohmed out at 11. Replaced the coil & still the same problem. I will be looking at the ignition module this weekend, does anyone know if the module can be tested? If so how? Auto zone says thay cant test it. My next spot to look at is a short in the Ignition Module harness. I will touch each wire in the harness and to ground to see if I get continuity. Any other ideas will be appreciated.
Thanks
rbm11761
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Welcome to AF.
Your post has been moved to its own thread since the thread you posted in was too old.
Before you check each wire in the ICM harness to ground make sure the ICM connector is open (disconnected from ICM) and any connectors on the opposing ends like at the ECU module and the crank position sensor, etc. are disconnected. Otherwise you may get a false short to ground or a short indication that is normal. I hope you are using a wiring diagram of the ignition control circuits?