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Home >> Jeep >> 2003 >> Grand Cherokee Overland >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Engine Controls - Service & Adjustment Specifications) >> Ignition Systems >> Ignition Timing
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Ignition Timing

WARNING: This page is about a different car, the 2003 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

All models are 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. To synchronize fuel system, see FUEL SYSTEM SYNCHRONIZATION under FUEL SYSTEMS in ON-VEHICLE ADJUSTMENTS article.

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