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Thread: puma 90 'humping around' on cold engine

  1. 27th July 2014, 09:23 AM #1
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    puma 90 'humping around' on cold engine

    Not sure whether it's a defender thing, but I find that when on a sealed road, on a cold engine, the defender humps around under engine load. Not sure whether this may be a sign of suspension issues, or something else? GenerallyThe symptom is a real jerky acceleration, or even while maintaining speed that this occurs. It only seems to happen on a cold motor. Might just be due too being thrown around the cab, pumping the accelerator while in the torque band?

    The only other time I've experienced this was on a lowered car with super hard Springs on a bumpy road- the bumps were causing the accelerator pedal to be pumped inadvertently, and I'd need to get off the throttle to regain control.
    Does anyone else experience this?
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  2. 27th July 2014, 10:51 AM #2
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    Toxic_Avenger
    This sounds a little like what was happening to me a while back.
    I have a 2008 110 defender.
    I was find that i would be flat spots or lake of power when the engine was cold particularly in gears 2 and 3. the power would come and go.
    I was also finding it increasing harder to start when she was cold.
    Until one day ( being the furthest from home of course ) she would not start at all.
    It ended up being a fuel spill rail, that was letting air in.
    Not an expensive fix just a very annoying one.

    It may be worth checking mate.
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  3. 27th July 2014, 03:51 PM #3
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    So where does one find the fuel spill rail?
    Is this the hp side or the return?
    There would probably be a considerable diesel leak around this area too?
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  4. 27th July 2014, 05:14 PM #4
    pannawonica
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    Kangaroo diesel diesel is what I call it, sensitivity to small throttle inputs at low speed.
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  5. 27th July 2014, 07:06 PM #5
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    Quote Originally Posted by Toxic_Avenger View Post
    So where does one find the fuel spill rail?

    Is this the hp side or the return?

    There would probably be a considerable diesel leak around this area too?

    Firstly I am no mechanic but when I took the rocket cover off I found some diesel sitting the the injector housings.
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  6. 27th July 2014, 07:09 PM #6
    n plus one Guest
    Mine did it once or twice a few yers ago and then sorted itself out - I thought maybe condensation on the MAF or something like that?

    It's running like crap at the moment, but that's alpine diesel for ya'!
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  7. 27th July 2014, 07:22 PM #7
    Grappler
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    My 130 2.2 had the surging acceleration problem at low speed.
    The ecu software was upgraded and now behaves ok
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  8. 27th July 2014, 08:13 PM #8
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    Quote Originally Posted by n plus one View Post
    Mine did it once or twice a few yers ago and then sorted itself out - I thought maybe condensation on the MAF or something like that?

    It's running like crap at the moment, but that's alpine diesel for ya'!
    That is highly likely, as it's generally when it's been sitting for a few days. It's been rather cold recently too, with frosts. I know it's likely one of those things which cannot be easily diagnosed at the dealers.
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