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Thread: TDI rough idle on start up

  1. #1
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    TDI rough idle on start up

    Hi folks
    i have owned my A2 for 4.5 years ,1.4 tdi , its been fantastic little car and has been faultless .... well until now !
    After a 150 mile trip on the weekend i turned the engine off and left the car for 7 hrs or so .It was a hot day . On returning to the car , on start up the engine started straight away but sounded rough, as if it was running on 2 cylinders . After moving off and driving slowly for a minute or so it was fine and idling as it should . This now happens every time i start the car , same symptoms , no firning problems , it fires straght away . No warm start problems at all

    Any suggetions

    thanks in advance
    Last edited by Audi lurker; 04-07-2011 at 11:41 PM.

  2. #2
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    Get a diagnostic scan done to see if any fault codes show up

    John
    03 TDi 75 SEAzure Blue: Cruise, customised interior trim and lighting, Pioneer Amp/Head Unit, Fusion Powerplant Woofers/Tweeters, Hella LEDayline DRL's, Bilstein B8's on Weitec Springs , 17" Lenso PD5 Matt Black Alloys, K&N Filter, Stealthed

  3. #3
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    Could be the first sign of the injector wiring harness going postal?


    Silver 03 TDi SE and OSS.
    Mods: Mk2 RNS-E & Bluetooth, Double-DIN, Bose + 6CD, heated SE leather seats & sport steering wheel, heated mirrors, cruise, komfortblinker, Koni FSDs & Weitecs, Whiteline RARB, AmD remap, 1.2TDi aero mods, 0.659 5th gear, twin-tone horn, DIS, rear electric windows, auto-dim mirror

    I sing in one of the world's finest choirs the Vasari Singers

  4. #4
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    Thanks for the replies guys
    i have vagcom on an old laptop , i will plug it in tonight and see if it throws any codes up .

    is there anything specific to the start up process , i started it this morning , same thing but after 30 seconds on the move its running as it should with a nice smooth even idle ?



    Mark

  5. #5
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    Probably one glowplug not working. Not an issue starting when the wether is warm, but the cylinder affected will misfire until it warms up.

    Does it happen on hot retsrats? If so, not a glowplug.

  6. #6
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    Quote Originally Posted by Madf View Post
    Probably one glowplug not working. Not an issue starting when the wether is warm, but the cylinder affected will misfire until it warms up.

    Does it happen on hot retsrats? If so, not a glowplug.
    Thanks
    I did suspect glowplugs , no problem with warm/hotstarts at all , just initial start up from cold , once moving or higher rev's for 30 seconds all ok .

    The glowplug light on the dash goes out straight away though ?

    Would vagcom show this up specifically or would it just identify misfire ?

    is glowplug changing a simple/diy job ?

    Mark

  7. #7
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    Glowplug light just says the relay is working and current is flowing. Doubt VAGCOM would show it up.

    Replacing glowplugs and testing them is easy on most diesels but depends on access. If access is easy, just remove, test with a live feed and see if it glows.. (warning hot: take precautions!).

    No idea on A2 sorry.

  8. #8
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    I didn't think the glowplugs would be lit up at all in the summer? (i.e., I thought they were only given current in winter conditions?)
    2002 1.4 TDi 75 SE OpenSky 6M/0.588

    VW Fuel saving tips

  9. #9
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    Quote Originally Posted by MikeMarsUK View Post
    I didn't think the glowplugs would be lit up at all in the summer? (i.e., I thought they were only given current in winter conditions?)
    Exactly, glowplugs shouldn't be lighting at all in the summer weather. Hence my suggestion of the injector wiring harness.


    Silver 03 TDi SE and OSS.
    Mods: Mk2 RNS-E & Bluetooth, Double-DIN, Bose + 6CD, heated SE leather seats & sport steering wheel, heated mirrors, cruise, komfortblinker, Koni FSDs & Weitecs, Whiteline RARB, AmD remap, 1.2TDi aero mods, 0.659 5th gear, twin-tone horn, DIS, rear electric windows, auto-dim mirror

    I sing in one of the world's finest choirs the Vasari Singers

  10. #10
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    ok , so if it was the injector wiring harness would it not happen all the time ? , not just on cold start up ?

    Mark

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