Hey, I just installed my boost gauge and I found what seems like a knob. its right to the left on the intake manifold behind where you have to splice for the T-fitting, its like a black knob, I turned it but put it back where it was. What the heck does it do????

 

Auto Self Detination

DONT TOUCH IT!!

 

Help us out. Take a picture of it. Did you buy your car NEW? or almost New? It might be a MBC?

 

i think i know what you're talking about, i think i had it on my last car. i think it's just a solenoid or something and the knob does nothing

 

It's a filter on the fuel pressure solenoid.