S15/T15 Jimmy 2WD V6-173 2.8L VIN B 2-bbl (1983)
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Distributor: Description and Operation
On all models with full function systems except V6-229 (1983 - 84 VIN code 9) engines, the ``R'' terminal on the 7 terminal ignition module provides
reference pulses to the ECM indicating engine RPM and crankshaft position.