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Ignition Timing: Navajo

  1. Engine is equipped with a distributorless ignition. Base (initial) timing is preset at 10 degrees BTDC and is not adjustable. To check base timing, turn ignition off.
  2. Disconnect SPOUT in-line connector in Yellow/Light Green wire near Ignition Control Module (ICM), in right front corner of engine compartment. Start engine.
  3. Connect timing light and check timing. If ignition timing is not 10 degrees BTDC, proceed to TESTS W/O CODES and appropriate G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section below. Turn off engine. Connect SPOUT in-line connector.
IGNITION TIMING SPECIFICATIONS

Application Man. Trans. (1) Auto. Trans.
B4000 (2) 8-12 @ 475-575 8-12 @ 475-575
Navajo (3) (3)
(1) Place automatic transmission in Park.
(2) Connect jumper wire between Green test connector and ground.
(3) Base (initial) timing is preset at 10 degrees BTDC and is not adjustable. To check timing, see ADJUSTMENTS article in the ENGINE PERFORMANCE section.
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