Can any one tell my where my knock sensor is and how I can tell if its playing up as I thought my ecu should retard the timing when it detects detting

 

The knock sensor is on the top of the block down under the intercooler, if you look where the gear box joins the engine it's just in front of that, All I can say is it's a b4stard to change, had to replace mine the other day.
If you look at the engine towards the top right hand side, You'll find a wire and a connector that disapears down under the intercooler.

As for playing up, I've no idea, my check engine light came on indicating it was a knocksensor so I changed it.

£56 +Vat from my local dealer

 

Just changed mine on a 1995 WRX Jap wagon,

Dont worry its easy, remove intercooler ( slacken jubilee clips & wiggle it out )
Looking from front of car lean over with a small torch & look between the 2 right hand "legs" of the inlet manifold, you will see a 12mm ( maybe 13mm ?) bolt head with a small black or dirty cotton real sized lump of plastic under it.
This is the standard knock sensor, most of the pictures I've seen on the net of knock sensors are in a slightly different place ( further towards the back of engine ) which may be where aftermarket one are placed, who knows but thats where mine was

Disconect electrical connector which was under intercooler & in middle of engine, undo bolt with socket set I managed easily with a 1/2" drive so anything smaller will be fine. The bolt is not tight ( 16 ft/lbs I think ) but is glued in ( locktite ) so requires a bit more to remove, do not overtighten when reinstalling cause you smash the sensor & have to start again !!

I take it you must have a code 22 from your ECU tellin you theres a problem ?

SS

 

i have no code coming up its just the ecu is not retarding the ignition when the engine starts to det i was hoping that it might be a dodgy wire or sumert

 

pretty sure if there was a wiring fault the ECU would tell yah about it, as a sensor fault how do you know your gettin DET ? knocklink or extreamly good hearing ?

SS

 

oh you can here it it sound like some one is playing drums on my engine and slight black smoke or grey smoke out the back the more boost i run the worse it gets

 

Take a look on here, you want the section about fitting a Knocklink.

Cars/Modifications/gauges

http://www.stefanostadal.homedns.org/index.htm

Rob