Idle Speed, Co Level & Ignition Timing

Ensure idle speed, CO level and base ignition timing are set to specification. If necessary, see the appropriate ADJUSTMENTS article in this section. Refer to the following menu:

NOTE: For the appropriate ADJUSTMENTS article, go to:

For Cabriolet, see: ADJUSTMENTS
For Corrado SLC, see: ADJUSTMENTS
For EuroVan, see: ADJUSTMENTS
For Fox, see: ADJUSTMENTS
For Passat GL 2.0L 4-Cylinder, see: ADJUSTMENTS - 4-CYL
For Passat GLX 2.8L VR6, see: ADJUSTMENTS - VR6

IDLE SPEED & CO LEVEL

Application

Idle RPM

CO Level %

Cabriolet ⁽¹⁾

Digifant I

750-850

0.3-1.2

Digifant II

750-850

0.3-1.1

Corrado SLC ⁽²⁾

650-750

0.3-1.5

Fox

⁽³⁾ 875-925

0.3-1.2

Passat GL

⁽⁴⁾ 800-1000

0.2-1.2

Passat GLX ⁽²⁾

650-750

0.3-1.5

⁽¹⁾	With engine running, after reconnecting Blue coolant temperature sensor. See the ADJUSTMENTS article in this section for more information.

⁽²⁾	Idle speed and fuel mixture (CO level) are not adjustable.

⁽³⁾	If A/C equipped, disconnect idle speed boost valve harness connector when checking idle speed. Clamp crankcase breather hose near emission control valve when checking CO level.

⁽⁴⁾	Idle speed is not adjustable.

IGNITION TIMING (Degrees BTDC @ RPM)

Application

Checking

Adjusting

Cabriolet ⁽¹⁾

4-8 @ 2000-2500

5-7 @ 2000-2500

Corrado SLC

⁽²⁾

Fox ⁽¹⁾

4-8 @ 2000-2500

5-7 @ 2000-2500

Passat GL

4-8 @ 800-1000

5-7 @ 800-1000

Passat GLX

⁽²⁾

⁽¹⁾	On Digifant I systems, ensure engine oil temperature is 176°F (80°C) and Blue engine coolant temperature sensor is disconnected.

⁽²⁾	Ignition timing is computer controlled. Information is not available from manufacturer.

IGNITION TIMING ADVANCE (Degrees BTDC @ RPM)

Application

Specification

Cabriolet

Digifant I (California)

⁽¹⁾ 27-33 @ 4500

Digifant II (Other 49 States)

⁽¹⁾ 20-30 @ 2300

Fox

Digifant I (California)

⁽¹⁾ 27-33 @ 4500

Digifant II (Other 49 States)

⁽¹⁾ 20-30 @ 2300

All Other Models

⁽²⁾

⁽¹⁾	With Blue engine coolant temperature sensor connected. Specification is in addition to the initial setting.

⁽²⁾	Ignition timing advance is computer controlled. Information is not available from manufacturer.