Ignition Timing

Ignition timing is controlled by Powertrain Control Module (PCM) and is non-adjustable. Manufacturer lists procedure to check base ignition timing.
Start and warm engine to normal operating temperature. Shut engine off. Insert paper clip into engine speed detection Blue connector, located near the firewall and battery. See Fig 1 . Connect tachometer to paper clip.
Start engine and allow to idle. Ensure all accessories are off and transaxle is in Park (A/T) or Neutral (M/T). Ensure idle speed is 650-850 RPM. Turn ignition off.
NOTE: DO NOT use scan tool to check ignition timing. If scan tool is used to check ignition timing, ignition timing will not be the base ignition timing.
Install timing light. Remove waterproof connector from ignition timing adjustment Brown connector, located near the firewall and battery. See Fig 2 . Using jumper wire, ground terminal of ignition timing adjustment Brown connector. This sets the system to base ignition timing.

Fig 1: Identifying Engine Speed Detection Blue Connector
Courtesy of CHRYSLER CORP.

Fig 2: Identifying Ignition Timing Adjustment Brown Connector
Courtesy of CHRYSLER CORP.
Start engine and allow to idle. Note ignition timing using timing marks at crankshaft pulley and front cover. Ignition timing should be 2-8 degrees BTDC.
Ignition timing is nonadjustable. If ignition timing is not within specification, a problem exists in the electronic control system. See the TESTS W/CODES article for diagnosis of electronic control system.
If ignition timing is within specification, shut engine off. Remove jumper wire from ignition timing adjustment Brown connector. Start engine. Recheck ignition timing. Ignition timing should now be approximately 8 degrees BTDC. Remove tachometer.