Idle Speed & Ignition Timing: Notes

WARNING: This page is about a different variant/trim than selected.

Ensure idle speed and ignition timing are set to specification. See appropriate table. For adjustment procedures, see the ADJUSTMENTS - 4.0L article.

NOTE: Always refer to Emission Control Label in engine compartment before attempting service. If manual and label differ, always use emission label specifications.

IDLE RPM SPECIFICATION

Application

RPM

4.0L

⁽¹⁾

⁽¹⁾	Idle speed is computer controlled and not adjustable.

BASE IGNITION TIMING

Application

Degrees BTDC

Aerostar

⁽¹⁾ 10

⁽¹⁾	With SPOUT in-line connector unplugged.