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3.1L (Camaro & Firebird) Buick Regal III

  1. Warm engine to normal operating temperature. Disconnect Electronic Spark Timing (EST) by-pass connector, located on wiring harness near right shock tower.
  2. Connect timing light to spark plug No. 1 wire. Loosen distributor hold-down bolt. Set timing to 10 degrees BTDC at 675 RPM (all models) with transmission in Park (A/T models). Tighten distributor hold-down bolt, and recheck timing.
  3. Turn engine off. Reconnect EST by-pass connector. Clear ECM code by disconnecting battery negative terminal for at least 30 seconds.