I think the IN is the bottom (black) and the OUT is the top (white). Just replaced it on mine too after learning in another thread what it was - MAP Filter. I think it stops shite reaching the MAP (Manifold Absolute Pressure?) sensor and giving false readings - so I can see that it could cause the ECU to make bad decisions.
When I replaced mine, there had been a bit of oil leaking from it so cleaned it all up and put a new one in. Old one probably 16 years old, doubt anyone else has ever changed it!
When I replaced mine, there had been a bit of oil leaking from it so cleaned it all up and put a new one in. Old one probably 16 years old, doubt anyone else has ever changed it!