Ignition Timing: Adjustments

Ignition Maps And Knock Sensor Control:

Ignition timing is NOT adjustable, the Motronic ECM completely controls the ignition timing based on several input sensor signals. Once the ECM has determined the proper timing for current driving conditions, ignition timing follows a preset three dimensional map which will deliver optimum efficiency. If the ECM gets a signal from a knock sensor for instance, then the ECM will retard timing and switch to another timing map to prevent further pinging.

Hall Sender Alignment:

The only procedure that can remotely be considered timing adjustment, would be distributor housing placement. This is because the Hall sensor is located inside (see NOTE below). The distributor housing placement (or alignment) is set with engine at TDC and really only aligns the Hall sensor to the shudder wheel window, moving the distributor housing (either right or left) will NOT change timing.

Camshaft Position Sensor, Early Production AAN Engines:

Camshaft Position Sensor:

NOTE: The first AAN 20v turbo engines are fitted with a distributor housing, in which the Hall sensor is located. All later AAN engines have the Hall sensor located behind the camshaft sprocket and there is NO alignment or adjustment.