Ignition Timing

NOTE: Depending on model, Pickup models use EEC-IV or EEC-V system. EEC-IV PCM has 60-pin connector. EEC-V PCM has 104-pin connector. See ENGINE/VIN ID article for correct application.

Ensure engine is at operating temperature, all accessories are off, and transmission is in Park or Neutral. Set parking brake. Ensure idle speed is correct.
Connect timing light to No. 1 spark plug wire. Disconnect Idle Air Control (IAC) wiring harness connector. Start engine. Check base ignition timing. See BASE IGNITION TIMING table.
If timing is not to specification, loosen distributor hold-down bolt. Adjust timing as necessary. Turn engine off. Reconnect IAC harness connector. Start engine. Ensure advance mechanism functions when engine speed is increased.

BASE IGNITION TIMING

Application

Degrees BTDC

3.0L

⁽¹⁾ 13-17

⁽¹⁾	With IAC solenoid connector unplugged.