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Home >> Jeep >> 2003 >> Grand Cherokee Overland >> Repair and Diagnosis >> General Information >> Specifications Index >> Common Specs & Procedures >> Ignition System >> Ignition Timing
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Ignition Timing

NOTE: Ignition timing is controlled by Powertrain Control Module (PCM). No adjustment is required.

Ignition timing is non-adjustable. DO NOT attempt to adjust ignition timing by rotating oil pump drive shaft assembly (4.0L). If oil pump drive shaft assembly is rotated or replaced, fuel system synchronization will be changed.

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