Ignition Timing

NOTE: Perform all adjustments with engine at normal operating temperature, cooling fan and accessories off, transmission in Park or Neutral, and front wheels in straight-ahead position.

NOTE: Adjustment of ignition timing cannot be performed on vehicles equipped with Distributorless Ignition Systems (DIS). If ignition timing is not within specification, see CRANKSHAFT POSITION SENSOR in SYSTEM/COMPONENT TESTS article.

Locate ignition timing adjustment connector. See IGNITION TIMING ADJUSTMENT CONNECTOR LOCATION table. Connect jumper wire between ignition timing adjustment connector and ground. Check ignition basic timing.

If ignition basic timing is not within specification, loosen distributor and rotate to adjust timing if necessary. See IGNITION TIMING SPECIFICATIONS table. Remove jumper wire from ignition timing adjustment connector.

NOTE: Ignition timing adjustment connector is either round or oval with protective cover. Connector is either Black or Brown and is secured to harness with colored transparent tape.

IGNITION TIMING ADJUSTMENT CONNECTOR LOCATION

Application

⁽¹⁾ Wire Color

Location

Diamante

White/Yellow

⁽¹⁾

Stealth

Black/Green

⁽²⁾

3000GT

Black/Green

⁽²⁾

⁽¹⁾	On main wiring harness, near center of firewall.

⁽²⁾	On main wiring harness, near wiper motor on firewall, behind battery.

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

Application

⁽¹⁾ Basic

⁽²⁾⁽³⁾ Actual

Diamante

SOHC

3-7 @ 600-800

15 @ 600-800

DOHC

2-8 @ 600-800

15 @ 600-800

Stealth & 3000GT

2-8 @ 600-800

15 @ 600-800

⁽¹⁾	With ignition timing adjustment connector grounded.

⁽²⁾	With ignition timing adjustment connector ungrounded. Actual ignition timing is approximate and may fluctuate 5-7 degrees.

⁽³⁾	If vehicle altitude is more than 2300 feet above sea level, actual timing may be advanced (5 degrees).