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Thread: Unstable reving when coming to idle

  1. 14th January 2015, 08:18 AM #1
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    singlecell
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    Unstable reving when coming to idle

    TD5 Auto - So when coming to a stop when the car comes down to about 20km/h the engine seems to cut in and out a bit, starts a sort of grr grr grr as it comes to a stop then idles properly. Only does it when decelerating.
    Ive seen other people online in other forums mentioning it also but I have never seen a reason for it, I have also heard other TD5s do in when then drive near me. Its always done it, and doesnt seem to be causing any issues, I am just curious what is going on.

    Thanks.
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  2. 14th January 2015, 08:57 AM #2
    discorevy
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    ecu is cutting. fueling to injectors on overrun
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  3. 15th January 2015, 09:15 PM #3
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    singlecell
    singlecell is offline Master Silver Subscriber
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    Ah OK. So its normal or some cars are doing it wrong?

    Sent from my Nexus 5 using AULRO mobile app
    2003 D2a TD5 Auto
    1960 Series 2 Petrol
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  4. 16th January 2015, 12:50 AM #4
    discorevy
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    Yep , perfectly normal , td5 s make the clatter due to the camshaft operated unit injectors , some common rail cars will shut fuelling on overrun as well but no noise because pressure on common rail is due to a pump
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  5. 16th January 2015, 07:20 AM #5
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    singlecell
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    Awesome, thanks for the info!
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