Focus 2.0 TDCi / Ford service technicians

In message , Paul Giverin writes

Well the PCM update didn't work and the problem was getting worse. The master technician at the Ford dealership finally got the full story from Ford technical. Apparently the problem lies with the fuel injectors. The PCM update was designed to mask the problem or make it less severe.

As a new set of injectors cost circa £1000, Ford are keen to try any workaround rather than fix the root cause. My engine was put through a comprehensive set of tests including cylinder compression, fuel pump pressure check and injector back leakage checks. Despite all these checks passing with flying colours, Ford have authorised a new set of injectors to be fitted. I should get the car back on Monday so fingers crossed.

True - but in my situation (a 306 with idling problems), I self-diagnosed (with help from online) that I needed to replace the stepper motor. Did that and it make little long term difference (came back the 2nd time I started it). Put it into the garage which said it had 2 fault codes - Stepper Motor and MAP Sensor. Replaced the MAP sensor, reset the codes, and now just have 1 fault code - Stepper motor (even though it was only a day or two old).

So, either the (new) stepper motor is faulty, or the ECU is being weird. Considering it was also saying the coolant was -41 degrees after a test drive (-10 or something after starting), and it claimed it was doing 120kph, with 0rpm whilst sitting stationary, I'd go with the ECU...