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Old 11-17-2009, 10:27 AM   #11
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Fellas...last night while working on the car, 1 and 4 on the coil packs was not firing but the car would run. Today, I went and cleaned off the terminal ends on the coil pack of 1 and 4, and put it back on, and now the car will not start. I pulled the plug wires off different coil packs to check them and there is no spark coming out of ANY of the plugs now? Yesterday they sparked, today they won't...period.
I have checked all the fuses, cleaned off all the terminal ends on the coil pack. The firing order is correct the way I have it. I also replaced the part that the coils sit on last year when this problem arose.

Do you think it could be the computer or is there a certain fuse that I am not noticing that needs to be looked at?

Thanks for any and all help. I really appreciate it.
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Old 11-17-2009, 11:16 AM   #12
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Sounds like the ignition control module. This is the flat part that the 3 ignition coils mount to. Hold on until one of the guys with more ignition systems experience that I have chimes in on this.
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Old 11-17-2009, 11:22 AM   #13
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Could also be a crank position sensor. Check the ICM first.
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Old 11-17-2009, 04:46 PM   #14
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Took the ICM....was bad, replaced it, still not working...had no effect at all on it.

Any other suggestions?
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Old 11-17-2009, 04:57 PM   #15
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Also, should there be spark from the coil packs when turning over the motor? I laid the wires close to the coil pack to see if it would arc...but nothing...
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Old 11-17-2009, 04:59 PM   #16
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If you remove the wires and turn over the engine it will arch across the posts. Check the crank position sensor.
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Old 11-17-2009, 05:00 PM   #17
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Check the ICM plug:
https://www.gmforum.com/t284383/#post1392524

The other possibility is a bad crankshaft position sensor:
https://www.gmforum.com/t279066/

I am unsure on this, since the car was running, you work on the coils, and now the car won't run. Very coincidental for the CPS to fail at that exact same time, and I don't believe in coincidence. Let'* see what the others say. In the meantime, check the ICM plug.
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Old 11-17-2009, 05:27 PM   #18
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Thanks Dan..will check it out...in the meantime....printing off the links you gave me...I appreciate it.
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