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Home >> Volkswagen >> 1991 >> Fox Base, 1.8 A >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments - Gasoline >> Ignition Timing >> DIGIFANT II Timing Advance
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DIGIFANT II Timing Advance

  1. Check timing advance only after determining that the basic ignition timing is adjusted to specification. With the engine running at normal operating temperature, briefly raise engine speed to above 3000 rpm, repeating this step 4 times. Then let the engine idle for at least 2 minutes.
  2. Disconnect the coolant temperature sensor connector. Raise the engine speed to 2300 rpm, and record timing value. Reconnect coolant temperature sensor connector and briefly raise engine speed above 3000 rpm to store knock sensor information in memory. Raise engine speed to 2300 rpm and recheck timing. It should now be 30°+/-3° more advance than it was with coolant temperature sensor connected.
  3. If timing does not advance as specified, first check knock sensor mounting bolt torque, then check knock sensor resistance and wiring. If torque and resistance are within specification and there are no breaks in wiring, then Digifant control unit is probably fault.
  4. If connecting or disconnecting coolant temperature sensor has no effect on timing advance, check continuity of coolant temperature sensor wire. If there are no breaks in wire, then either Digifant control unit or temperature sensor is faulty. See FUEL SYSTEM - GASOLINE for information on testing coolant temperature sensor.
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