Have it scanned for fault codes. Since it starts well in cold temps but not in hot we may have a sensor fault. Unlikely fuel vapour issue as diesel . Possible fuel breathing system blocked? Garage ( main dealer) is best here.

It's been serviced 3 months ago.. had new injector seals.. I had a mate put that cleaner through it and loads of black came out the back last summer and it only happened once after that until yesterday.. so il try that again but is this something il have to do every year?

Injector cleaner. Haha. Too many possibilities. Needs to be connected to a scanner to read faults and monitor sensors.

Hi so has it been serviced in this time as most cars need a service every so often. also a bottle of injector cleaner now and again helps most diesel engines.

I've had my fiesta for about 1 and half years now and all through winter it is perfect. Starts no problem. But.. when it seems to be hot weather or I've been on a long journey the car just turns over when trying to start.. example yesterday I drove around 60 miles stopped in a service station and then it wouldn't start again.. 15 minutes later it started.. any ideas please. Thanks. Tom