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Thread: Ford Focus cuts out when slowing down

  1. #1
    Join Date
    Apr 2013
    Posts
    3

    Default Ford Focus cuts out when slowing down

    Hi, I have a 2008 1.8L Diesel Ford Focus. It has been a very reliable car up until recently. When driving at a constant high speed on a motorway and then slowing down to exit (I know it's not text book driving but I would often be lazy and knock it into neutral and coast) the engine just cut out. I tried to restart but it would cut out again within a few seconds. Then after a few more attempts the engine turned but wouldn't start at all. Two separate mechanics have said somehow the fuel filter was empty but can't pinpoint the reason. So I got the fuel filter seal replaced. That was okay until I did the same journey on the motorway a short while later. Again the car cut out when slowing down. And again I tried to restart but it would cut out again after a few seconds. This time the breakdown assistant gave it high revs and managed to keep the engine ticking over and it has been fine since. He says it is the DPF filter. The fumes from the exhaust didn't look the cleanest when he revved it. And when driving there would be a small puff of black smoke after the ititial burst of acceleration when changing gear. The car drives fine otherwise. Any ideas what it may be? I am on edge every time I take it for a spin....thanks

  2. #2
    Join Date
    May 2008
    Posts
    10,112

    Default

    If the DPF was blocked or blocking up the display on the dash would tell you of a DPF fault. The garages seem to be guessing a bit here. Have they connected your car to a diagnostic tool and examined all the live readings for all the sensors and components to see if there is a problem? If not, I would recommend you take the car to a diesel specialist garage as newer cars like yours are too complex for a lot of local garages without the correct diagnostic equipment.
    If the filter is empty then the pump is not drawing fuel through. That could be a high pressure fault or an air leak. The fuel pressure needs to be checked and also the injectors on good diagnostic equipment.

  3. #3
    Join Date
    Apr 2013
    Posts
    3

    Default

    Thanks for the advice Hometune. No diagnostic test carried out so that might be the next step. I'll update on the outcome.

  4. #4
    Join Date
    Sep 2013
    Posts
    1

    Default

    I have experienced the same problem on my Ford Focus TdCi (08 plate), but in my case the car would not start at all. I have called the an (alternative) breakdown service out to it twice. On the second occasion the engineer was watching the fuel pressure in real-time when interrogating the engine management unit. He then tried to start the engine, the pressure reading was low, it suddenly climbed and then engine fired. He as not able to identify the cause of the problem. The recommendation was the same - take it to a garage (ie a main ford dealer) with the full diagnostic kit. I'm just about to arrange this.

  5. #5
    Join Date
    Sep 2015
    Posts
    2

    Default

    Hi

    Im having the same problem with my 56 playe 1.8 diesel too. Did we manage to get to the bottom of these issues? It seems to drive fine on the side roads its only when im on the motorway at speed and then slow down as traffic builds up and then cuts out. Starts again after a few minutes......really annoying.

    Any advice would be appreciated.

  6. #6
    Join Date
    Jul 2015
    Posts
    647

    Default

    Fuel tank vent blocked maybe? Try doing the same run with the fuel cap off and see if you get the same symptoms. If you don't, it's more than likely a fuel tank venting problem. If you do get the same symptoms....take it to a specialist!

  7. #7
    Join Date
    Jul 2015
    Posts
    647

    Default

    Quote Originally Posted by bitten&hisses View Post
    Thanks for the advice Hometune. No diagnostic test carried out so that might be the next step. I'll update on the outcome.
    Looking at the date of the original post, it's a good job someone wasn't waiting for the update!

  8. #8
    Join Date
    Sep 2015
    Posts
    2

    Default

    Hi motman and thanks for the reply.

    I did fill up this morning and the petrol gun kept clicking as if to say the tank was full even though it only had a quarter tank when i started filling. Would this indicate anything? I eventually filled up to 3/4 as i couldnt put up with the clicking any longer.....

  9. #9
    Join Date
    Jul 2015
    Posts
    647

    Default

    Hmm. Does sound like a venting problem.

  10. #10
    Join Date
    Apr 2013
    Posts
    3

    Default

    Original poster here. The fuel filter that was in the car was a generic brand. It was later replaced with Ford parts and there has been no issue since.

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