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Timing Advance Test (Volkswagen 16-Valve)

  1. Perform KNOCK CONTROL FAULT DIAGNOSIS test. If knock sensor circuit is okay, ensure terminal No. 11 at ignition control unit is being used and grounded. Connect Timing Tester (VW 1367 ). Start and run engine at idle. Base ignition timing will be indicated on tester. Adjust if necessary.
  2. With engine running, pull vacuum hose off ignition control unit. Increase engine speed to 4300 RPM (engine code RD). Note reading on tester. To determine ignition timing advance, subtract base ignition timing from reading.
  3. Ignition timing advance should be 14-16 degrees. If timing is incorrect, check ground wire at terminal No. 11 of ignition control unit connector. If wire is okay, ignition control unit is defective.
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