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Rough Idle in "S" mode

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  • Rough Idle in "S" mode

    Anyone out there have a similar "problem" with the tiptronic in Tdi where it is set in "S" and stationary, it seems to idle rougher than being in "D".

    I have about 9000km on the clock.

    Any suggestions?
    DieselTig
    Victoria
    Tiguan Tdi Auto

  • #2
    The only difference I know of would be that in "S" its "preselected" 1st gear where in "D" its "preselected" 2nd. Haven't actually tried it as I very RARELY use "S" and when I do it's never form a standing start, but I'll have a try next time I'm out and see if mine's any different.

    Cheers
    Derek
    Alexandra
    2022 R-Line Golf Mk8 in Kings Red Metallic
    Previously 3 Tiguans 2008, 2013, 2017

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    • #3
      It's most likely common to all TDI's auto. More fuel is used when taking off in first gear, that's why it sound rougher (the instantaneous fuel consumption display should confirm that). If you use the "S" mode when not needed your DPF will have to catch more particles and the life of the DPF will be reduced. I would leave it in the "D" unless it is necessary to use "S".
      Performance Tunes from $850
      Wrecking RS OCTAVIA 2 Link

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      • #4
        Thanks, I only use it on very steep hills, or if when I need to cross a busy road and avoid the syptoms of turbo lag. I only noticed the other day. I will take your advice about the DPF lifespan. Much appreciated.
        Originally posted by Transporter View Post
        It's most likely common to all TDI's auto. More fuel is used when taking off in first gear, that's why it sound rougher (the instantaneous fuel consumption display should confirm that). If you use the "S" mode when not needed your DPF will have to catch more particles and the life of the DPF will be reduced. I would leave it in the "D" unless it is necessary to use "S".
        DieselTig
        Victoria
        Tiguan Tdi Auto

        Comment

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