W204 C220 CDI - Fast Idle?

Discussion in 'Engine' started by st13phil, Jan 4, 2009.

  1. st13phil

    st13phil MB Club Veteran

    Nov 6, 2007
    North Oxfordshire
    His - Denim Blue A220 AMG Line Premium / Hers - Obsidian Black R172 SLK55
    On the first start of the day having been left overnight my W204 has taken to starting on a fast idle (~ 1,500rpm) which it holds for approx 12-15 secs before settling back to the usual ~ 850rpm. This seems to have coincided with the very cold snap we're having, but I don't remember it doing this in the cold weather early last year. Having said that, I think that lately the overnight lows have been three or four degrees lower than I've experienced witth this car before.

    Is this a feature or a problem? Anyone know, or do I mention it to the dealer when it goes in for its A service in a couple of weeks?
  2. yachtman

    yachtman Hardcore MB Enthusiast

    May 11, 2007
    clk 320cdi
    dont worry.....

    :) It is a feature, the idea being the engine quickly establishes a sufficient oil pressure.

    my 320cdi does it, along with c200 did it. (also occurs with the wifes 1.9tdi polo)

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