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Home >> GMC >> 1985 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - HEI (Federal) >> Testing - ESC >> Engine Starting Problems

Engine Starting Problems

  1. Check all ESC harness connections, including 10-pin connector at ESC controller, 4-pin connector at distributor, 2-blade male connector to distributor, and 2-blade female connector to ignition switch lead (Pink wire). Repair connections as necessary.
  2. If all connections are okay, disconnect 4-pin connector at distributor. Install jumper wire between pins "A" and "C" of distributor connector. If engine will not start, check other causes of engine failing to start.
  3. If engine starts with jumper wire attached, remove jumper wire and reconnect 4-pin connector to distributor. With ignition switch on, connect voltmeter positive lead to pin "F" and negative lead to pin "K" on 10-pin connector. If under 7.0 volts, repair circuit between ignition switch and pin "F".
  4. If over 7.0 volts are read, check wires in ESC harness from pins "G", "H", "J" and "K" of 10-pin connector for opens or shorts. If harness is okay, replace ESC controller.
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