The symptoms are very confusing, try disconnecting the speed sensor down by the front wheel and see if that makes any difference as that can be the only way the ecu is detecting the car is moving. Why that should effect the idle I don’t know.
"Vehicle Speed Sensor (VSS) and Speedometer A properly connected and calibrated vehicle speed input is important for proper engine operation as the ECM uses the vehicle speed input for idle control and engine history data. It is recommend a H-D(R) #74430-00A or equivalent vehicle speed sensor be used. This sensor is compatible with most after market speedometers. The speed input into the ECM can come directly from this sensor, in parallel to the speedometer, or from an output signal from the speedometer."
Had this on an early Superdry - idle sat at 2000 when off pedal but would immediately fall to normal when coming to a standstill - changed every sensor including wheel speed sensor - still fault persisted - last resort changed ECU and fault disappeared and has now been fine for 2000+ miles. I advised Laurens to change the ECU - which he has but still fault persists so perhaps in this case the wheel speed sensor is faulty although I can't see how as the car idles fine when started and at all other times??
Last edited by Stevo666; 12/10/2204:58 PM. Reason: added info
