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Home >> Jeep >> 2003 >> Wrangler X, Standard >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Common Specs & Procedures >> Ignition System >> Ignition Timing
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Ignition Timing

Vehicle is equipped with Powertrain Control Module (PCM) computerized ignition. PCM controls ignition timing. DO NOT attempt to adjust ignition timing by rotating oil pump drive shaft assembly (4.0L). If oil pump drive is rotated or replaced, fuel system synchronization will be changed.

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