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2011 VW Passat 1.6tdi chugging when idle. Any ideas?

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  • 04-01-2017 11:35am
    #1
    all the bais
    Registered Users Posts: 85 ✭✭


    Hi Folks,

    Recently, my Passat has been slightly chugging when idle. Revs seem to be fine, and remain constant while idle. Thought it might have been the cold mornings, but it doesn't seem to be that.
    When I accelerate the car still runs very smoothly, and there are no error lights displaying on the dashboard.

    I plan on taking the car to the local mechanic on Saturday morning, however I thought I would see if a diagnosis could be made beforehand. (to put my mind at easy :confused:)

    Any ideas on what it could be.

    Thanks!
    Tagged:


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    #2
    biko
    Registered Users Posts: 81,220 ✭✭✭✭biko


    Not DIY effort, moved to main forum.

    If there are no lights on dash it is probably not a major issue. When was car serviced last?


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    #3
    all the bais
    Registered Users Posts: 85 ✭✭all the bais


    Thanks for the input, Biko.

    Car last serviced in August.


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    #4
    biko
    Registered Users Posts: 81,220 ✭✭✭✭biko


    Does it happen when car is started cold in the mornings or also when car is warmed up?
    What RPM does it idle at?
    Does it "hunt" (the RPMs goes up and down) when idling?


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    #5
    all the bais
    Registered Users Posts: 85 ✭✭all the bais


    biko wrote: »
    Does it happen when car is started cold in the mornings or also when car is warmed up?
    What RPM does it idle at?
    Does it "hunt" (the RPMs goes up and down) when idling?

    Yes, it happens in both cold mornings, and when it's warmed up.
    From memory, RPM is below 1000 when idle, and it doesn't hunt at all.


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    #6
    R.O.R
    Registered Users Posts: 12,685 ✭✭✭✭R.O.R


    Check to see if the coolant level is ok. Could be the first sign of EGR or water pump failure which are very common with that engine and both give similar symptoms.


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  • Options
    #7
    dre_jspeed
    Registered Users Posts: 216 ✭✭dre_jspeed


    Sounds like the idle air control valve is sticking. Get yourself a can of carb cleaner.


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    #8
    Special Circumstances
    Closed Accounts Posts: 7,569 ✭✭✭Special Circumstances


    dre_jspeed wrote: »
    Sounds like the idle air control valve is sticking. Get yourself a can of carb cleaner.

    The iacv being the valve that controls the idle airflow when the cable controlled throttle is closed yeah?

    ;-)


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    #9
    all the bais
    Registered Users Posts: 85 ✭✭all the bais


    Much appreciated folks.


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    #10
    dre_jspeed
    Registered Users Posts: 216 ✭✭dre_jspeed


    Special Circumstances wrote: »
    The iacv being the valve that controls the idle airflow when the cable controlled throttle is closed yeah?

    ;-)

    Yes, they were notorious sticking on the older VW


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    #11
    Special Circumstances
    Closed Accounts Posts: 7,569 ✭✭✭Special Circumstances


    dre_jspeed wrote: »
    Yes, they were notorious sticking on the older VW

    When did they make the last vw diesel with a cable controlled throttle and iacv do you know?


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    #12
    dre_jspeed
    Registered Users Posts: 216 ✭✭dre_jspeed


    Special Circumstances wrote: »
    When did they make the last vw diesel with a cable controlled throttle and iacv do you know?

    My bad, this is a diesel ignore my comments so.


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    #13
    Micky 32
    Registered Users Posts: 6,556 ✭✭✭Micky 32


    Injectors are known to give problems on a 1.6.


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    #14
    Toyotafanboi
    Registered Users Posts: 12,917 ✭✭✭✭Toyotafanboi


    If the revs are holding steady I'd be worried it's the flywheel.


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    #15
    all the bais
    Registered Users Posts: 85 ✭✭all the bais


    Evening folks. Just back from the garage and it was indeed an injector problem. £275 Plus Labour to replace, totalling £325.


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