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2. Automatic Performance Control - Wikipedia

   en.wikipedia.org/wiki/Automatic_Performance_Control

   To detect knock, a piezoelectric knock sensor (basically a microphone) bolted to the engine block responds to unique frequencies caused by engine knock. The sensor generates a small voltage that is sent to the electronic control unit , which processes the signal to determine if, in fact, knock is occurring.

3. Engine knocking - Wikipedia

   en.wikipedia.org/wiki/Engine_knocking

   A control loop is permanently monitoring the signal of one or more knock sensors (commonly piezoelectric sensor which are able to translate vibrations into an electric signal). If the characteristic pressure peak of a knocking combustion is detected the ignition timing is retarded by steps of a few degrees.

4. Engine swap - Wikipedia

   en.wikipedia.org/wiki/Engine_swap

   The much improved 3RZ-FE engine features a 9.5:1 compression ratio and uses newer technology such as a hot wire mass airflow sensor, knock sensor, and a narrow angle dual camshaft cylinder head. The result is a more powerful engine with much improved efficiency, achieving 17–21 miles per gallon [ 3 ] when used in a daily driven rock crawler.

5. Subaru EJ engine - Wikipedia

   en.wikipedia.org/wiki/Subaru_EJ_engine

   The Subaru EJ engine is a series of four-stroke automotive engines manufactured by Subaru. They were introduced in 1989, intended to succeed the previous Subaru EA engine . The EJ series was the mainstay of Subaru's engine line, with all engines of this series being 16-valve horizontal flat-fours , with configurations available for single, or ...

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   mail.aol.com

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7. Idle air control actuator - Wikipedia

   en.wikipedia.org/wiki/Idle_air_control_actuator

   The result is an engine that fails to maintain idle RPM and frequently stalls. A jammed actuator may be freed simply by cleaning it. However an actuator that has stopped working due to a fault in its servomotor will need replacement. Air leaks in either the stepper housing or pipes will cause elevated idle RPM.