Ignition system
The ignition system of the MOTRONIC 2.10.2 is a conventional
electronic system with ignition coil, distributor with rotor
arm, distributor cap and HT leads.
The firing order is 1-3-4-2.
Inside the distributor is a camshaft position sensor (Hall-effect sensor) which, by means
of a slotted rotor with a gap, tells the control module when cylinder 1 is in position for
combustion (ignition). When the engine is being turned over by the starter motor and at engine
speeds up to about 600 rpm, the control module uses a fixed ignition point of 5° BTDC.
At engine speeds above 600 rpm and when the throttle position sensor indicates that the
engine is idling, the control module sets the ignition timing at 10° BTDC as long as the
engine is running under no-load conditions. In connection with upshifts and downshifts on cars
with automatic transmission, engine torque is limited by retarding the ignition by up to
12°.
Ignition timing is determined by the control module on the
basis of the following information:
|
•
|
Knocking (if occurring)
|
