knock sensor

[free]

would jst like to no a few things about it,

whats it for?
 whats it do?
how do you no if its seen better days?
 ect.

thanks

paul

[mk1]

It senses when the engine pre-ignites, ie pinking. The ecu receives a signal from the sensor and retards the timing until the pinking stops. Very hard to test without a scope, usually substitution is the way to go.
Steve.

[free]

cool, thanks steve, all i new about it b4 is that:
its on the side of the head (above the gear box) connected 2 a whire,
and u got 2 tarqe it up rite, cos if u dont its fookd.
and is a bin bag job.

[mk1]

The knock sensors are usually fitted on the block, what engine do you have?.
Steve.

[free]

yes it is the block,  near where the water pipe gos in our out,
its a digifant in my gti n 1.6, in my driver