Volkswagen Golf/Jetta 2 manual

Ignition timing - checking and adjustment
Ignition system - fully electronic type / Ignition timing - checking and adjustment


1 This procedure is as described in Chapter 1, Section 17, for the TCI-H system. Operation of the control unit can also be checked as follows.

2 Run the engine at idling speed and note the basic ignition timing. Pull the vacuum hose from the control unit, then increase the engine speed to 4600 rpm and read off the ignition advance. Deduct the basic advance and the resultant value should be 18°, this being the advance attributable to engine speed.

3 Reconnect the vacuum hose, then run the engine to 4600 rpm. Note the ignition timing.

Pull off the vacuum hose and again increase the engine speed to 4600 rpm. The ignition timing should be approximately 20° retarded from the previously-noted figure. This amount indicates the advance attributable to engine vacuum.


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