Posted by Sprint 6 on March 03, 2020 at 18:39:40 from (107.77.210.55):
In Reply to: chevy s10 posted by dale2 on March 03, 2020 at 07:47:32:
The ignition control module controls the coils. The PCM does not have the ability to shut down just one coil. The orange and white wires only control the timing of the spark, not if it happens. If the ignition module does not receive a timing input, it fires the coils at base timing. To check if the coil is being commanded, remove the offending coil, start the engine, and connect a test light across the terminals, it should flash. Have the wires and plugs been changed? On a waste spark GM system, one shorted wire or plug can steal the spark from its companion. Not common, but I have seen it happen. I bet that is what is going on here.
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