The density of an object is the mass of the object compared to its volume. The equation for density is: Density = mass/volume or D = m/v. Each substance has its own characteristic density because of the size, mass, and arrangement of its atoms or molecules.
Rating Newest Oldest. Best Answer: The knock sensor is basically a microphone. Its there to listen for spark knock which is also called detonation, pinging, and pre ignition. This is the condition inside the engine where the fuel begins to burn before its supposed to. It sounds like someone rattling a can of marbles. It can easily destroy the internals of an engine.
Answer     on a 2001, with the 3.3, the knock sensor is under the water crossover pipes, which are under the intake manifold. Pain to change.