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5.9L V8

  1. With parking brake on, transmission in Park and A/C off, warm engine to normal operating temperature.
  2. With ignition off, connect timing light and a properly calibrated tachometer. Disconnect and plug distributor vacuum advance hose. Slightly loosen distributor hold down bolt to allow adjustment.
  3. With engine idling, check and adjust timing according to specification on Emission Control Information label (if necessary). Tighten distributor hold down clamp and recheck ignition timing.
  4. With engine off, remove timing light and tachometer. Reconnect vacuum advance hose.
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