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Thread: seems to rev on its own sometimes

  1. #1
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    Default seems to rev on its own sometimes

    Hi,

    Just noticed today when driving the car that sometimes the car kind of revs on its own like you'd got a clutch pressed in a little.

    Has anyone ever had this. It dont happen all the time most of the time i thought it was the wife riding the clutch lol

    My cars a 2004 2.0DTI if it makes any difference.

    Cheers Alan

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    Nothing makes my DTI revs increase at all bar the accelerator pedal. My previous petrol Astra used to increase the revs when the aircon started up to prevent stalling but not on the DTi. I don't recall the power steering doing it either, but I could be wrong as I've not particularly looked out for it.

    Perhaps keep an eye on it and see if you can tie it down to happening when some other system that draws electrical current is running? I'll keep an eye out on mine if I remember.

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

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    Does it do it just as you switch the engine off as well (ie keeps running a a for a second or two after shut off)? If so I would say the turbo bearings may be on the road out and are maybe letting excess oil into the inlet system.

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    It could be a sign of the turbo nearing the end of its life

    Presumably you notice this when slowing down in a high gear, as you disengage the clutch the revs size slightly
    This is an EMS program to prevent stalling

    To check this run in neutral at slow speed, with the engine running at idle
    Whilst still in neutral apply about 2500rpm and once the engine has reached this, remove the gas
    The revs should return straight to idle, and this is normal
    If the revs drop to idle then rise, then there is an issue
    Perform the above, and report back

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    ok Thanks for this ill check in the morning if it does rev high again is that a massive problem??

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    Quote Originally Posted by GazCDTI150 View Post
    Does it do it just as you switch the engine off as well (ie keeps running a a for a second or two after shut off)? If so I would say the turbo bearings may be on the road out and are maybe letting excess oil into the inlet system.
    Oh and yes to this the engine does keep running for a few seconds after. Again is this a massive problem??

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    Quote Originally Posted by Alank View Post
    Oh and yes to this the engine does keep running for a few seconds after. Again is this a massive problem??
    Does your car have the valve in the inlet manifold to cut off the air supply when the engine is switched off? Some DTI's have it and some don't. I would think that cars that don't have it run on a bit more than cars that do (like mine). Given the previous few posts it sounds like it may be running on lubricating oil but still it's worth ruling out the cheap/free things as well?

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    Quote Originally Posted by James24 View Post
    Does your car have the valve in the inlet manifold to cut off the air supply when the engine is switched off? Some DTI's have it and some don't. I would think that cars that don't have it run on a bit more than cars that do (like mine). Given the previous few posts it sounds like it may be running on lubricating oil but still it's worth ruling out the cheap/free things as well?
    I really couldnt tell you the answer to that sorry lol

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    As I say, maybe not important anyway but if you want to, take a quick pic of the front of the engine - either standing from the front of the car with the engine cover removed or under the front of the engine cover if you want to leave it on - and post it here.

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    Quote Originally Posted by m8internet View Post
    It could be a sign of the turbo nearing the end of its life

    Presumably you notice this when slowing down in a high gear, as you disengage the clutch the revs size slightly
    This is an EMS program to prevent stalling

    To check this run in neutral at slow speed, with the engine running at idle
    Whilst still in neutral apply about 2500rpm and once the engine has reached this, remove the gas
    The revs should return straight to idle, and this is normal
    If the revs drop to idle then rise, then there is an issue
    Perform the above, and report back
    If i have done this check correctly then the car just stopped at idle rev then i carried on my trip it didnt rev high on its own or anything

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