Regal V6-252 4.1L VIN 4 4-BBL (1983)
Ignition Control Module: Description and Operation
PURPOSE
The "R" terminal on the 7 pin ignition module provides reference pulses to the ECM indicating engine RPM and crankshaft position.
Buick Workshop Service and Repair Manuals
HEI Module - Testing|Page 2437 >
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