is that a one way valve or a filter?
It was a filter.
When I had the old ecu, the MAP sensor data was all over the place, and that was meant to sort it, which it did a little.
Forgot to take it off when the ECU got swapped to a standalone.
Worst part, was the fact we were looking at the map line at Llandow when we were trying to fix it. We thought we better move the map line as it looked a bit close to the exhaust manifold and something might melt if it stayed there...
