Ignition Timing: Testing and Inspection

Ignition timing, checking

Requirement

Engine oil temp. minimum 80° C (176° F)

Fig. 1 Connecting test equipment






- Connect test equipment for ignition timing and rpm as shown

WARNING: Ignition must be switched off when connecting ignition timing tester and rpm display

- Start engine and allow to idle

Fig. 2 Temperature sensor II






- Disconnect temperature sensor II
- Raise engine speed to 2000-2500 rpm
- Record timing value displayed on tester
- Reconnect temperature sensor II
- Raise engine speed to 3000 rpm
- Read timing on tester, subtract recorded value from this reading
Calculated value must be 35° ±5°

If NO
- Check electrical connections for temperature sensor II, air flow sensor and Digifant control unit according to wiring diagrams

Ignition timing, adjusting

Requirement

Engine oil temp. minimum 80° C (176° F)

- Connect test equipment for ignition timing and rpm (see Fig. 1)

Note: Use adaptor VW 1473 for connecting tester VW 1367 to terminal 1 of ignition coil.

- Start engine and allow to idle
- Disconnect temperature sensor II (see Fig. 2)
- Check ignition timing at 2000-2500 rpm correct if necessary

Adjustment with TDC marker

Ignition timing is displayed directly on tester. specifications:
Checking value 3° - 7° BTDC
Adjusting value 5° ±1 BTDC

Adjustment with timing light

Notch on V-belt pulley must match separating line on crankcase
- Correct idle setting if necessary