Diesel engine poor start/cut out - my story - now fixed

[SD1too]

Originally Posted by madone

... does a petrol engine 75 with an auto box disengage when braking whilst going downhill ... The diesel coasts.

Graham,

I've found something interesting about the diesel which possibly explains your impression of 'coasting'. When you use the brakes, cruise control disengages. When this happens on the diesel, MG Rover says:
"Fuel delivery from the injectors is decreased to the engine idle speed range.

Another interesting discovery, common to both diesel & petrol engines, is that the gearbox ECU has a special cruise control mode using a shift map less sensitive to changes in 'throttle' opening to prevent unnecessary gear shifts.

This might explain a slight difference in performance depending upon whether cruise control is engaged or not, but I stress that in all cases the torque converter remains part of the drivetrain. The road wheels are never disconnected from the engine.

Simon

[madone]

Thanks for the explanation Simon really appreciate it. I hope it has cleared it up for us all.