Oldsmobile 21024981 Sensor Assembly, Knock

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Remove the intake manifold. Disconnect the CKP sensor wiring harness. Remove the CKP sensor bolt, then remove the sensor. Installation is the reverse of removal.

When installing the knock sensor, be sure to tighten it to the specific torque.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

The oxygen sensor in the exhaust monitors oxygen content. To check it, you can check its millivolt signal while the engine warms up. It is also important to inspect the oxygen sensor heater and ensure it receives proper voltage.

To disconnect the CKP sensor, start by disconnecting the cable from the negative battery terminal. Then, raise the front end of the vehicle and secure it on jackstands. Next, disconnect the electrical connector from the CKP sensor and remove the sensor mounting bolt. Remove the sensor from the engine and inspect the 0-ring for any damage. If necessary, replace the 0-ring. Apply a small amount of engine oil to the 0-ring and install the CKP sensor, making sure to tighten the mounting bolt securely.

The knock sensor is located on the rear part of the engine block, to the left of the distributor.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

The knock sensors detect engine knock. To check them, you should check for reference voltage and resistance.

The oxygen sensor in the exhaust monitors oxygen content. To check it, you can check its millivolt signal while the engine warms up. It is also important to inspect the oxygen sensor heater and ensure it receives proper voltage.

The vehicle speed sensor (VSS) provides speed data to the PCM. To check it, you can check for reference voltage.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

The manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. To check it, you should check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes.