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