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- Thu Jun 23, 2005 3:36 pm
- Forum: OEM EFI Hardware
- Topic: GM coilpack - wiring/schematics requested
- Replies: 3
- Views: 758
Must be like a crank or cam sensor. Maybe just a reference signal to let the PCM know what #4 is doing. If you used your own crank signal/sensor, you don't need that ignition module. Those coils can be fired by any signal. They look like the same ones on the 2.8, 3.1 ...