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Thread: Erratic Metalic Noise/Lumpy Idle

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    Regular Member barkzz's Avatar
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    confused Erratic Metalic Noise/Lumpy Idle

    Hi Guys,

    As you will be aware, I had the EGR off the other week, cleaned it all out, and chucked it back on. (1.9CDTI 150PS)

    Im still having the lumpy idle issue, and unsure as to the cause? (It's fine after leaving the engine to tick over for a few minutes, and go's away).
    Performance doesnt seem much better, there still seem to be two settings, throttle on, and throttle off!

    More worryingly, there is a high frequency metallic rattle, that increases in speed when the engine is revved, it's coming from where ive ringed on the pictures.

    Has any one any ideas what it is? You cant tell with the bonnet shut, but with it open, you can hear it auidiably coming from this area.

    I dont seem to recollect it doing this before i cleaned the EGR. Has cleaning the EGR somehow caused this? (Though i doubt very much).

    Thanks for the advice.

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    Regular Member Stevie-B's Avatar
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    Does the rattle only happen when in gear or only when rev'ed? I have a similar problem yet my rattle seems to come from the tensioner area.
    Last edited by Stevie-B; 28th April 2009 at 13:24.

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    Regular Member Avenged's Avatar
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    is it not just normal diesel rattle?

    And now since you've cleaned the EGR valve, are you more concious of the nose?

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    Full Member Vaux-Man-G's Avatar
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    Sorry to but I too am itnerested in finding out what that slight lumpy idle could be as this happens on my dad's CDTI SRI 150 too, but without the noise.

    Also, I am going to clean the EGR too (hopefully) this weekend and just wanted to know what I should clean it with?

    Thanks.


    Bye bye Vec B
    - Hello Siggy!

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    Regular Member Stevie-B's Avatar
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    Quote Originally Posted by Avenged View Post
    is it not just normal diesel rattle?

    And now since you've cleaned the EGR valve, are you more concious of the nose?
    Yes you could be right yet 'Im still having the lumpy idle issue' is the concern as well.....

    While cleaning the value did you follow the advice recently posted by jon7278 who works for vx.

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    as for the lumpy idle if it only does it when the engine is warm check the swirl bar that controls the swirl flaps as these bars become loose or even fall off their pegs. If it has fallen off or is loose then there is a how 2 to sort this.

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    Regular Member barkzz's Avatar
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    Quote Originally Posted by Stevie-B View Post
    Does the rattle only happen when in gear or only when rev'ed? I have a similar problem yet my rattle seems to come from the tensioner area.
    Quote Originally Posted by Avenged View Post
    is it not just normal diesel rattle?

    And now since you've cleaned the EGR valve, are you more concious of the nose?
    The rattle is there continuously, wether in gear or not, and obvously its more pronounced at higher revs, as it rattles more quickly.

    I dont think im being more concious of the noise, im just wondering is there something in that area that could cause it? Seems to be somewhere around there, but not being familiar with this engine, im a bit stuck?

    The lumpy idle onyl seems to be when the car is cold, and it doesnt always do it, normally sorts itself within a few minutes and is fine after.

    Even though ive done the EGR clean, im still struggling a bit in the lower range revs, so im wondering is this all related?

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