1990 pickup knock sensor

what does the knock sensor do? where is it located on a 3vze 3.0l? and how hard is it to change?

It is on the topdeck of the block under the intake manifold and pluenum most time it is the wire that goes bad kinda a big job
look at this link
http://www.yotatech.com/f116/katie-s-3vze-head-gasket-job-104934/

you can see the knock sensor on the fifth pic down between the heads(10th posting)
Dave

Thanks alot. The pictures are great! As they say "a picture is worth a thousand words" and takes out the guess work.


Toyogirl