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If its electronic and in the dizzy it is called the crank angle sensor. It ultilizes a special optical based rotor and sensor. This part is pricy and is the only "real" electonic component in the distributer. It is located under the rotor, under the dust cover. I think its commonly called the crank angle sensor, ignition control module, or ignition pickup. Im not familar with testing this piece other then replacing it though, sorry.


of those parts I can only find the ignition control module on rockauto.com website and I've just put a new icm on.

1989 SWB V6 5 speed 230K