Hey guys gotta question.....u know that hose that connects between your MAP sensor and the manifold.....well that small filter that is inline between the MAP sensor and manifold is it a filter that can flow in both directions or is it a one way check valve.......? I inspected mine and it was flowing in both directions....but when I shook it around a little I could hear something rattling around inside....so I figured it was a one way check valve that went bad....so I replaced it with an after market 1 way check valve. and installed it so that air would be flowing away from the sensor(so it would read vacuum)... Car seems to run ok with it. dunno..... So maybe u guys might..... Thanx.... Tony

 

Nope, it's just a filter. The arrow is so that the dirty side of the filter is always the dirty side. I can't imagen that a check valve would allow the car to run well. How would boost, or Vacuum be read at the same sensor. Strange