Knock sensor

Knocking combustion of fuel occurs when the ignition is too early and the engine is running on fuel with a low octane rating. Detonation occurs when the speed of flame propagation in the combustion chamber approaches the speed of sound, mainly towards the end of the combustion process and the residual gases are sufficiently compressed and have a high temperature. Detonation is characterized by very high impulse pressure, which leads to overheating of the engine, damage to the piston, cylinder head and crankshaft bearing shells.

The knock sensor is screwed all the way into the cylinder block. It reacts to the high-frequency vibrations of the cylinder block that occur during detonation and transforms them into electrical signals to the control unit.

Removing

DOHC engine

• Turn out bolts and remove an engine cover.
• Remove the air filter.
• Turn out bolts and remove the resonator and an arm of the vacuum reservoir in gathering (pic. 9.22).

• Turn out a bolt and remove a clip of fastening of a socket of wires of the sensor of concentration of oxygen.

All engines

• Turn out bolts and remove a support of an inlet collector.
• Disconnect the connector from the knock sensor (pic. 9.20, 9.21).

• Remove the knock sensor from the cylinder block (pic. 9.23).

Installation

• Installation is carried out in the reverse order of removal.