Knock sensor (Mitsubishi Space Star)

Detonation combustion of fuel occurs when ignition is too early and the engine is running on fuel with a low octane number. Detonation occurs when the flame propagation speed 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 pulse pressure, which leads to engine overheating, damage to the piston, cylinder head and crankshaft bearing liners.

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

Removal

DOHC Engine

• Remove the bolts and remove the engine cover.
• Remove the air filter.
• Remove the bolts and remove the resonator and vacuum reservoir bracket assembly (Fig. 9.22).

• Loosen the bolt and remove the clamp securing the oxygen concentration sensor wire connector.

All engines

• Remove the bolts and intake manifold support.
• Disconnect the connector from the knock sensor (Fig. 9.20, 9.21).

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

Installation

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