20 Technical Description
Ignition system, knock control (contd.)
80V
DET
The control module determines whether knocking is
occurring in any of the cylinders by analyzing the ion-
ization currents passing through the spark plugs. If
knocking occurs, ignition is retarded. In the event of
substantial ignition retardation or high boost pres-
sure, a richer fuel-air mixture is also supplied. As a
final step, boost pressure is reduced.
Saab 9000
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