[paulpicks21]

My car has always had one , it was on it when i bought it , but my question is - What does the adjustment nut/screw on the back adjust? obviously you can turn it both ways but just wandered what it was for.

Cheers

Paul.

 

[AlBoy]

i think it adjusts how quickly it lets the air out, if you have problems at idle you will need to adjust this nut