I have searched this forum for information before posting but haven't found any questions already raised that exactly match the problem we're having with our Scenic MKIII 2013 TDi.
When the outside overnight temperature is low (anything below 5 degrees C) the car does not start immediately first thing in the morning.
The glow plug indicator lights when the start button is first pressed, goes out and then the engine turns over for 5-10 seconds but it fails to start and the starter motor stops. This repeats when the start button is pressed again. Sometimes it will start during this second round, on other occasions it will take three or four presses of the start button before it will start.
Sometimes during the start attempts it sounds like it is about to "fire" but doesn't. Once the engine has started though it seems absolutely fine. It drives perfectly well with no other problems and there are no dash warning indications.
This only happens when it is first started on a cold morning. Whenever the car is started subsequently that day, even if left parked up for quite a few hours, it always starts first time. We've owned the car since October and did not experience any problems starting it in the morning until the weather started to get really cold in December.
Looking on this forum I realise there are lots of potential causes; fuel pump,
sensor, coolant temperature sensor - but is anyone able to narrow the likely causes down to the symptoms I've described please? Or can anyone suggest a set of checks I can make to accurately diagnose the cause?
Many thanks in advance for any words of advice you can offer!