Knock Sensor

[maximumrpm]

what is it where is it located..

pics please....cheers

[blind_elk]

There's usually 2 of them. They are located on the block, underneath the inlet manifold. One is located near Cyl#2, and the other near Cyl#5.

[maximumrpm]

do you have a pic to make it a bit easier for me....cheers

[blind_elk]

Not something I carry around in my hip pocket. I'll see what I can do over the weekend.

Meanwhile, go and have a look at your engine - I'm sure you will be able to see them (easier from above, down through the plenum runners).

[maximumrpm]

ok cheers no problem....how do you clean them??? just with electronic alcohol???

[Duncan]

no you can't really clean them they are basically little microphones.

About 1.5cm in diameter, black, and they have a bolt thru the middle tying them to the block.

[Sumo]

I agree with Duncan, cleaning them wont really help you. Normally they are a Peizo Electric type sensor, they have a crystal inside - and when it gets hit it produces a signal voltage. ECU reads this - retards your timing and you lose power.

Same idea with you BBQ lighters, that have a crystal that gets hit when you click the button and it produces a high voltage and you see that spark jump across the tip.

Cheers

Sumo

[OnDubz]

Hey, i'm also interseted to find out where the knock sensors are (in rb20), as they maybe the reason to why my car is acting up. I tried looking for them but couldnt seem to find them. All i could find where these things that went into the block that kinda looked like o2 sesnors near cylinders 2 and 5.

[Rolls]

Hey, i'm also interseted to find out where the knock sensors are (in rb20), as they maybe the reason to why my car is acting up. I tried looking for them but couldnt seem to find them. All i could find where these things that went into the block that kinda looked like o2 sesnors near cylinders 2 and 5.

<{POST_SNAPBACK}>

My mates got some minor rattles from his bottom end bearings which we think the knock sensors are picking up and retarding the timing as some days its real fast others its shocking, would unplugging them cause the timing to stay at the base timing? or would it not function correctly?