Town & Country Van AWD V6-230 3.8L VIN L SMFI (1998)
Knock Sensor: Description and Operation
PURPOSE
When the knock sensor detects a knock in one of the cylinders, it sends an input signal to the PCM. In response, the PCM retards ignition timing
for all cylinders by a scheduled amount.
OPERATION
The knock sensor threads into the side of the cylinder block in front of the starter motor.
Knock sensors contain a piezoelectric material which constantly vibrates and sends an input voltage (signal) to the PCM while the engine operates.
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As the intensity of the crystal's vibrations increase, the knock sensor output voltage also increases.
CAUTION: Over or under tightening effects knock sensor performance -- possibly causing improper spark control.
