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Home >> Volvo >> 1994 >> 940 Base, 4D Sedan, AW71 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Idle Speed & Ignition Timing

Idle Speed & Ignition Timing

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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