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Thread: Tapping noise from engine

  1. #1
    Regular Member Teapot's Avatar
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    Vehicle InfoStats

    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

    Default Tapping noise from engine

    Not really a big problem yet, but over the past year or so my signum 1.9cdti engine has started making a tapping noise from the engine, which has gradually worsened. It is very audible when cold, and quietens when the engine has warmed up but can still be heard faintly during accelleration.

    At first I suspected worn camshaft or a dicky valve lifter, but I have noticed that the noise disappears on the overrun (i.e. when no fuel is being injected), so its probably not cam/valve noise as in my experience this would be the same regardless of engine load.

    Recently I have also noticed a slight misfire at idle, particularly when the engine is cold. Is it possible that an injector on its way out could cause both these symptoms? If so, how can i find out which one? opcom is not showing any fault codes at the moment?

    The car has done 116k...

  2. #2
    Regular Member Mopar Man's Avatar
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    If it sounds like a diesel Knock, Get the injectors overhauled at a diesel specialist.

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    Regular Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

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    Quote Originally Posted by Mopar Man View Post
    If it sounds like a diesel Knock, Get the injectors overhauled at a diesel specialist.
    Thanks, I didn't realise that common-rail injectors were serviceable. I thought that the only solution was to identify which one had become faulty and replace it with a new one.

    How much should I expect to pay for the set of 4 to be reconditioned?

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    Regular Member Mopar Man's Avatar
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    Quote Originally Posted by littleteapot View Post
    Thanks, I didn't realise that common-rail injectors were serviceable. I thought that the only solution was to identify which one had become faulty and replace it with a new one.

    How much should I expect to pay for the set of 4 to be reconditioned?
    About £40 each

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