Checking the ignition timing (BMW 3 Series E46)

As part of the maintenance, adjustment of the idle speed, ignition timing and CO concentration is not carried out, since these parameters are continuously adjusted by the electronic engine management system.

If there is a deviation of the actual parameter values from the required ones, the reason lies in the failure of the corresponding elements, which must be replaced. A qualified check of the engine management system is possible using a stroboscope or special diagnostic devices. Connect the stroboscope lamp in accordance with the manufacturer's instructions. With the engine idling, direct the stroboscope beam into a special window and check the position of the ignition mark.