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Thread: 2010 Puma 2.4 110 motor jidders while coasting when cold

  1. #1
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    2010 Puma 2.4 110 motor jidders while coasting when cold

    Hi all,

    anyone had experience with what feels like motor cutting out, briefly during coasting, disappears when you accelerate? Only notice when engine is warming up. I wondered if it could be accelerator pedal connectivity issues or maybe more a fuelling problem while motor is in warming up mode? Knowing that acceleration removes the issue I guess means it’s not a fuel pressure issue, or is it? I don’t know if the fuel pressure drops when coasting? Sometimes it really gets the donk donk donk through the drive train but again disappears when you accelerate. I’ll hook up the gap 2 diagnostics one day and see if there’s any obvious signs but there are no fault codes to report… anyone have ideas? Cheers

  2. #2
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    I'm not sure but if you have the gap tool may be look at live data (if no fault codes showing) to see what is happening when it does it, eg fuel rail pressure?
    2001 Disco D2 V8
    2008 Defender 90
    2013 Disco SDV6

  3. #3
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    how many km's has it done?

    the pot on the accelerator pedal very very rarely fail, in fact the previous model (TD5) it rarely failed.
    the FCV is the only thing that comes to mind, as you mention it only happens when cold.

    fuel delivery issues can plague the 2.4 a little bit as the whole line from the fuel tank is a suction line, but lack of fuel will cause it to rattle its head off and it will list pressure faults.
    Regards
    Daz


  4. #4
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    If you stick on the diagnostic tool and get no error codes, it could be the VCV.

    Another thing to check is if the connections on your battery are nice and tight.

    I have experienced this before, one time it was the negative terminal that was loose. I shimmed it with a thin lead plate and it went away. Now I shim both positive and negative terminals to make sure. You can reuse the shims, just don't forget they are there when you move to a new battery.

    In another instance, it was definitely the VCV. My truck is a 2011 2.4 Puma and I've already replaced my VCV four times!

    They are quite sensitive to dirt and moisture so you have to make sure your fuel is as free of both as possible. As I mentioned in another thread on here, some people actually replaced these annually as a maintenance item. You may not have to got that far if you're still on your original one. Just keep in mind that if you do get a replacement, get two so you have a ready spare.

  5. #5
    Join Date
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    Yep, that's a symptom of a failing FCV, VCV, SCV or whatever you'd like to call them

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