i dont really understand im assuming a knock sensor sees engine vibrations ? what engine symptoms would make a knock sensor give out excessive readings, can any engine excessive vibration make it show readings ?

 

Knock can be caused by a lot of things, most common being:
Bad Fuel
Wrong plug grade
incorrect mixture (lean or rich)
head gasket failing
valve guides failing
piston rings worn


Incorrect detection can be caused by lost of things too, such as:
loose engine parts
worn valve train
bore wear
bearing wear

The list goes on...

 

exactly that mate. The knock occurs when the piston rattles it's way down the bore thus creating a vibration. This is what the sensor detects.

One thing worth doing is to replace the sensor and tighten the bolt down to the correct torque. Some sensors rely on a certain amount of 'crush' to read correctly. Incorrect torque can result in iffy readings. Once overtightened the sensor should be renewed.

 

thanks stu confirmed my thoughts mate. im gonna take a vid of the noise of my engine today if i can get it to do it. its so quiet and disapears after a second ?

 

as i said before youre a brave man buying a skyline with a rattle.

All the best mate, i hope it wont be to expensive.

 

+1

 

yup defo brave

 

or.....

 

wont be crying mate. i cant loose can get another very low miles lump for Ł2800

 

yeah i saw that,

not a bad option if its fubar

 

id be interested in your input mate. il post a vid of engine noise latter once its done.

 

no probs i will have a listen later