9-5 Sport Wagon (9600) L4-2.3L Turbo (B235) (2003)
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Idle Speed: Description and Operation
Idling Speed Ignition Timing
Engine Speed And Ignition Timing Dependency
When idle speed control is active, the ignition advance is 10° before top dead center (BTDC).
Depending on the engine coolant temperature, idle speed control requests an idling speed.
If the current engine speed falls below the requested speed, e.g. when the power steering pump loads the engine as the steering wheel is turned, the
ignition is advanced by up to 10°.
This is done to increase the engine torque to compensate for the drop in engine speed. How much the ignition is advanced depends on how large the
difference is between the current engine speed and the requested. The ignition is retarded in the same way when the current engine speed is higher than
the requested.
