Auto Repair Articles

Question:

I need to locate a Knock Sensor on my 1991 Olds Ciera with a 3300 engine.

Answer:
This sensor is a piezoelectric sensor located near the back of the engine (transaxle end). It generates electrical impulses which are directly proportional to the frequency of the knock which is detected. A buffer then sorts these signals and eliminates all except for those frequency range of detonation. This information is passed to the ESC module and then to the ECM/PCM, so that the ignition timing advance can be retarded until the detonation stops. If you need further assistance let me know. Please Click Accept Now as it is the only way I get paid.

Fig. 4: A piezoelectric sensor is located near the back of the engine (transaxle end). It generates electrical impulses which are directly proportional to the frequency of the knock which is detected

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