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Home >> Volvo >> 1993 >> 940 Base, 4D Sedan, AW70 >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine Controls - Basic Diagnostic Procedures) >> Idle Speed & Ignition Timing

Idle Speed & Ignition Timing

WARNING: This page is about a different car, the 1994 Volvo 960, 1994 Volvo 940, and 1994 Volvo 850. 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. For idle speed adjustment procedures, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section. Ignition timing is not adjustable.

IDLE SPEED & CO LEVEL (1)

Application Idle RPM (2) % CO Level
850 (3) 850 (3) .2-.8
940
Non-Turbo 775 .4-.8
Turbo 750 .4-.8
960 750 .4-.8
(1) Idle speed and CO level can only be checked, not adjusted.
(2) Measured upstream of catalytic converter with oxygen sensor connected.
(3) With cooling fan off.
IGNITION TIMING (Degrees BTDC @ RPM)

Application (1) Timing
850
Non-Turbo 8-12 @ 750-850
Turbo 4-8 @ 750-850
940
Non-Turbo
EZ 116K (Bosch) 12 @ 725-825
REX-I (Bendix) 10 @ 725-825
Turbo 12 @ 750
960 5 @ 750
(1) Ignition timing is computer-controlled and is not adjustable.
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