Originally Posted by Zach
Hi Richard

Thanks for your reply very interesting. One other thing I forgot to mention which that my be useful but may be a complete red herring.

I am pretty sure but can't be certain that the Ford fusion with the DBW was not fitted with an idle speed control valve. If I understand the function of this valve correctly it bypasses the throttle plate at idle so that the PCM can effectively open the throttle. This takes account of the the increased load that can be applied to an idling engine with lights, heater fan, powder steering etc. So if there is no ISCV then I am guessing that that function is taken care of by the fact that the PCM sits between the pedal and the throttle plate and can choose to modify what the pedal position is calling for. My Morgan has the old fashion mechanical throttle cable but has a PCM, so has a ISCV valve fitted.

Regards Tony

Zach, we need you to work out why the 3.7 Roadsters suffer rev hang and if it's related to all this complexity discussed above

If you can find a cure there's lots of interested parties & you could make a few £££

Jon M