GM 88971397 Sensor,Knock

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The knock control system is designed in order to lessen spark knock during heavy detonation periods. This gives the engineer an opportunity to make use of optimal spark advances for improved driveability. The output voltage produced by the knock sensor increases as the severity of the knock increases. The PCM monitors the voltage signal, retards ignition timing until detonation ceases. On the front side of engine block, below the cylinder head and mounted on a stud bolt is where knock sensor is located. Remove cable from the negative terminal. Cooling system needs to be drained. Intake manifold should be removed. Disconnect electrical connector and remove fastening nut securing knock sensor and then remove sensor itself. Attach a slight angle at bottom with the connector facing downward in right manner in order to reduce water ingress into it. Fix tightly mounting fastener of a detection device capable of capturing various engine knocking sounds. Do not screw up with your equipment lest something happens to it; over-tightening may cause damage however small it might be that you cannot even see without magnifying glass. Plugin electrical connector, refill cooling system, and look for leaks.