Base Ignition Timing

NOTE: Base Ignition timing on the 2.3L models is not adjustable.

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section. Ensure all accessories are off and transmission is in Park or Neutral. Set parking brake. Disconnect automatic parking brake release (if equipped). Ensure vehicle front wheels are in straight-ahead position and curb idle speed set to specification.

NOTE: Ignition timing is not adjustable on models with DIS or EDIS.

6-CYLINDER BASE IGNITION TIMING

Application ⁽¹⁾

Degrees BTDC @ RPM

4.9L

10 @ ⁽¹⁾

⁽¹⁾	Information not available from manufacturer. Use Scan tool to set idle.

V6 BASE IGNITION TIMING

Application ⁽¹⁾

Degrees BTDC @ RPM

2.9L

Automatic Transmission

10 @ 800

Manual Transmission

10 @ 850

3.0L

10 @ ⁽²⁾

4.0L

Timing not adjustable.

⁽¹⁾	With SPOUT in-line connector disconnected.

⁽²⁾	Idle speed is not adjustable.

V8 BASE IGNITION TIMING

Application

⁽¹⁾ Degrees BTDC @ RPM

5.0L

Automatic Transmission

10 @ 525-825

Manual Transmission

10 @ 550-850

5.8L

C6 Automatic Transmission

10 @ 630-930

E4OD Automatic Transmission

10 @ 580-880

Manual Transmission

10 @ 580-880

7.5L

10 @ 500-800

⁽¹⁾	With SPOUT in-line connector disconnected.