Car Knock Sensors

What Are the Symptoms of a Bad Auto Knock Sensors?

Auto Knock Sensor is used to measure the engine jitter and adjust the ignition advance angle when the engine produces knock. If there is a fault, the engine deflagration signal cannot be detected and the ignition time cannot be postponed automatically. Judge whether there is a fault through the following phenomena.

• Knock Engine of automotive knock sensor

When the engine is working, engine knock will be caused by excessive ignition time advance (ignition advance angle), engine load, temperature and fuel quality. In case of knock, before the piston moves to TDC, the light one will produce noise and reduce the power of the engine, the heavy one will damage engine mechanical parts.

• ECU Cannot Monitor the Degree of Deflagration

In case of damaged, ECU cannot monitor the degree of deflagration, it will reduce the ignition advance angle, when ECU detects that the engine has deflagration through the deflagration sensor, so it is wrongly judged that there is no deflagration. In this case, ECU will increase the ignition advance angle and cause the engine to work rough and shake due to deflagration.

• Automatic Delay Ignition Time

Automatically delay the ignition time to prevent engine detonation. Therefore, the engine will be in the working state of ignition delay. The fuel consumption will increase, combustion energy rate will decrease, and engine power will decrease.