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2009 Fiesta judder under acceleration

  • 14-04-2015 8:10pm
    #1
    quarryman
    Registered Users, Registered Users 2 Posts: 7,497 ✭✭✭


    This is a peculiar one.

    When I'm on the motorway and drop a gear to accelerate from 80kmh up to about 100kmh I feel a "judder" through the body of the car.

    Its not alignment or balancing as it doesn't happen when cruising at that speed but only when the engine is put under load. It goes away when I stop accelerating.

    It never happens at low speed and moving away from stopped so I'm ruling out clutch.

    Very strange.

    It's a petrol 2009 with about 35k miles so I would have doubted DMF. Does it even have one?

    Any ideas?

    Sparks, coils? Though I would have thought this would show at idle and also give a warning light...


Comments

  • #2
    Craftylee
    Registered Users, Registered Users 2 Posts: 429 ✭✭Craftylee


    Wonder if its the fuel pump - do you lose power when accelerating at any other time?


  • #3
    Foxhole Norman
    Registered Users, Registered Users 2 Posts: 5,875 ✭✭✭Foxhole Norman


    A coil would definitely show at idle, the car will be rougher as it'd be running on less cylinders. Check your MAF, see if it's clogged or dirty.


  • #4
    quarryman
    Registered Users, Registered Users 2 Posts: 7,497 ✭✭✭quarryman


    nope. No power lost at any other time. In fact no power lost at all. It keeps accelerating, it just shudders. It's through the body too, not the steering wheel or pedals.

    It feels mechanical rather than electrical, so I'm leaning towards driveshaft.


  • #5
    mullingar
    Registered Users, Registered Users 2 Posts: 5,340 ✭✭✭mullingar


    Sounds like its misfiring only when under load.

    You may have a weak coil or a long shot: semi-blocked injector.


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