The knock sensor converts cylinder block vibrations, due to knocking, into voltage signals. These signals are various voltages according to the strength of the knocking. These signals are input into the ECM. The ECM controls the delay in the spark timing according to these signals.
When knocking occurs when driving at maximum load, the following problems, other than the knock sensor, can be the cause: incorrect spark plug heat rating, incorrect gasoline, incorrect standard spark timing adjustment.
The knock sensor is located in the intake valley, under the intake.
| Fig. 1: The location of the knock sensor in the intake
manifold valley — 3.5L engine
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