Hi,
I have recently changed to a revision D diverter valve from the original C. The C appeared ok, not torn etc. but after the D went in the car is really struggling mpg wise. The trip computer before would get to and regularly exceed an indicated 35 mpg average but now it struggles to hit 30 on the same journeys.
Is this normal for a rev D? Or should I go back to a diaphragm valve?
Thanks,
Matt