Idle Speed & Ignition Timing

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ADJUSTMENTS article.

IDLE SPEED SPECIFICATIONS ⁽¹⁾

Application

RPM

Manual Transmission

750-850

Automatic Transmission

680-780

Fast Idle

2000-3000

⁽¹⁾	Idle speed is set with headlights and cooling fan off and automatic transmission in Drive.

IGNITION TIMING (Degrees BTDC @ RPM)

Application

Setting

Base Timing (White Mark)

4 @ 600-700

Advance Timing (Red)

Carbureted

Auto. Trans. ⁽¹⁾

13-17 @ 680-780

Man. Trans. ⁽²⁾

22-26 @ 750-850

Fuel Injected

Auto. Trans. ⁽¹⁾

13-17 @ 600-800

Man. Trans.

13-17 @ 700-800

⁽¹⁾	Auto. trans. in Drive.

⁽²⁾	Advance timing is 18-22 degrees BTDC on California vehicles.