Idle Speed & Ignition Timing

WARNING: This page is about a different car, the 1993 Volvo 940. However, it is still accessible from the selected car via links, so may be relevant.

If adjustable, ensure idle speed and ignition timing are set to specification. See IDLE SPEED & CO LEVEL and IGNITION TIMING tables below. For idle speed adjustment procedures, see ADJUSTMENTS article. Ignition timing is not adjustable.

IDLE SPEED & CO LEVEL

Application

Idle RPM

⁽¹⁾ CO%

Non-Turbo

775

0.6

Turbo

750

0.6

⁽¹⁾	With O2 sensor disconnected. CO level is measured before catalytic converter.

IGNITION TIMING (Degrees BTDC @ RPM)

Application

⁽¹⁾ Timing

940

12 @ 725-825

⁽¹⁾	Ignition timing is computer-controlled and is not adjustable.