AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 303)

EFI Components 297
© 2014 AEM Performance Electronics
KNK (Knock Sensor)
The knock sensor is like a microphone mounted to the engine block that is used to detect
combustion knock. Every engine is different with respect to the amount of noise it generates. In
most production engines, the sensitivity of the knock sensor is based on an average noise profile
generated during dyno testing. A knock sensor that has a slightly lower threshold of sensitivity to
knock is used to compensate for variances in engine noise. When the engine makes noise in
frequencies and amplitude higher than the baseline noise profile, the sensor senses knock and
the ECU reduces ignition timing until the noise (knock) is suppressed. Engines that have knock
sensors on them from the factory need to have the baseline noise profile recorded when setting
up the AEM Infinity.
For information on tuning with knock sensors, go to Knock Control
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