BMW 13627568422 Knock Sensor

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Two knock sensors are used, bolted to the left-hand side of the cylinder block. One sensor detects knocking in Numbers 1 to 3 cylinders, and the other sensor detects knocking in Numbers 4 to 6 cylinders. Disconnect the cable from the negative terminal of the battery. Remove the intake manifold. Locate the sensor connector bracket which is located beneath the idle speed control valve. Warning: If both knock sensors are to be removed, mark the wiring connectors to ensure correct installation. Incorrect reconnection may result in engine damage. Unclip the connector from the retaining clip, and disconnect the sensor wiring connector(s). Unscrew the retaining bolt and remove the knock sensor, noting the routing of the wiring. The sensor for cylinders 1 to 3 is located beneath the temperature sensors in the cylinder head. The knock sensors are located just below the cylinder head on the engine block. The sensor for cylinders 4 to 6 is located to the rear of the sensor wiring connector bracket. Commence installation by thoroughly cleaning the mating faces of the sensor and the cylinder block. Install the sensor to the cylinder block tightening the securing bolt to the torque. Route the wiring as noted before removal, then reconnect the connector(s) and clip the connector to the bracket ensuring that the connectors are positioned as noted before removal. Install the intake manifold.

Use a torque wrench to tighten the sensor mounting bolt, being careful not to overtighten it.

After reinstalling the intake manifold, reconnect the sensor electrical connectors and route the harnesses as they were originally.

Knock sensors are piezoelectric microphones tuned to the frequencies of engine knock or detonation.

Camshaft sensors respond to an impulse wheel mounted at the end of the camshaft and are used for various functions such as cylinder recognition, spark timing, sequential fuel injection, VANOS (camshaft timing), and Valvetronic (variable valve) control.

It is crucial to note the installed angle of the knock sensor on the block before removal to ensure proper reinstallation in the same position.

The KS sensor allows the ECM to optimize ignition timing based on various factors.