Cutlass Cruiser V8-307 5.0L VIN Y 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.
Oldsmobile Workshop Service and Repair Manuals
Ignition Control Module|Description and Operation|Page 88 >
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