Idle Speed & Ignition Timing

For adjustment procedures, see ADJUSTMENTS - EFI article.

IDLE SPEED SPECIFICATIONS

Application

Idle RPM

Amigo & Pickup

2.3L

⁽¹⁾⁽²⁾ 900

2.6L

⁽¹⁾⁽³⁾⁽⁴⁾ 900

Impulse

⁽¹⁾ 850

Trooper

2.6L

⁽¹⁾⁽³⁾ 900

2.8L

⁽¹⁾⁽⁵⁾ 800

⁽¹⁾	Transmission or transaxle in Park or Neutral.

⁽²⁾	Disconnect and plug vacuum advance, canister purge and EGR vacuum lines.

⁽³⁾	Disconnect fuel pressure regulator Vacuum Switching Valve (VSV). Disconnect and plug canister purge and EGR vacuum lines.

⁽⁴⁾	On California models, disconnect and plug vacuum line for EGR vacuum switching valve.

⁽⁵⁾	Disconnect distributor set timing connector. Connector is a Black/White wire with White connector, located below tray at rear of center console. If specification varies from underhood emission label, use specification from label.

IGNITION TIMING (Degrees BTDC @ RPM)

Application

Base Timing

Amigo & Pickup

2.3L

6 @ 900

2.6L

12 @ 900

Impulse

⁽¹⁾ 9-11

Trooper

2.6L

12 @ 900

2.8L

10 @ 800

⁽¹⁾	With jumper wire installed in ALDL diagnostic connector, located behind right side of instrument panel. Increase engine speed to 1500-2000 RPM to read timing specification (if necessary).