Idle Speed, Co Level & Ignition Timing

WARNING: This page is about a different car, the 1993 Volkswagen Passat, 1993 Volkswagen Fox, 1993 Volkswagen EuroVan, 1993 Volkswagen Corrado, and 1993 Volkswagen Cabriolet. However, it is still accessible from the selected car via links, so may be relevant.

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.