Viano engine problem when towing

Discussion in 'Engine' started by Jock, Jul 26, 2015.

  1. Jock

    Jock New Member

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    Car:
    Viano 2.2 CDi 2007 Ex long
    Just started towing my caravan with a Viano 2.2 , 150 bhp. Whilst towing, the engine feels as though it is misfiring every now and then so makes a very uncomfortable ride. Without the caravan the car drives without any issues. The caravan is not too heavy for the car as some people have suggested. Any ideas please??!!
     
  2. E270 Owner

    E270 Owner Hardcore MB Enthusiast

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    S E London
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    Anything I get my hands on.
    Welcome to the forum

    You can get very different experiences when towing
    depending on weight and design of what's behind you you can get a push pull effect.

    I drag a twin axle trailer all over Europe loaded and unloaded,
    we have 3 of them and all give a different experience,
    one in particular is a tilting design and feels tiresome when towing and i don't know why

    :)

    Understanding the dynamics of towing | Caravan Chronicles
     
  3. Bobby Dazzler

    Bobby Dazzler MB Club Veteran

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    My first thought is that it's not a misfire, more likely the caravan throwing it's weight around.

    Have you towed the same caravan (with similar load on board) with any other vehicles?
     
  4. OP
    OP
    Jock

    Jock New Member

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    Joined:
    Jul 26, 2015
    Car:
    Viano 2.2 CDi 2007 Ex long
    Thanks Bobby Dazzler. We've towed the same caravan, loaded similarly, with two other vehicles but not had this problem. Convinced it's a problem with the engine.
     
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  5. Bobby Dazzler

    Bobby Dazzler MB Club Veteran

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    Curious. Wild card, because a dodgy one can cause some strange and valid symptoms, but I would look at the MAF next. If it's never been replaced then it might be a good idea to do do it anyway - I think it only cost £55 from the main dealer on our ML270 CDi.

    Whereabouts are you and do you have a trusted Mercedes socialist close by? Best to get it connected to STAR to read any diagnostic codes which may have been stored.
     
  6. V12

    V12 MB Club Veteran

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    Auto or manual? If manual it could be dual mass related.
     
  7. OP
    OP
    Jock

    Jock New Member

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    Car:
    Viano 2.2 CDi 2007 Ex long
    It's automatic...
     
  8. OP
    OP
    Jock

    Jock New Member

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    Car:
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    Thanks Bobby Dazzler...we're trying that now. having a hellish time as were supposed to catch ferry to France Saturday lunchtime...!
     
  9. Bobby Dazzler

    Bobby Dazzler MB Club Veteran

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    How did you get on?

    I hope it's fixed soon, and on your way to France. Good luck! :thumb:
     
  10. OP
    OP
    Jock

    Jock New Member

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    Car:
    Viano 2.2 CDi 2007 Ex long
    Couldn't get sorted before going away and after a final diagnostic with MB specialist there were no faults showing. Towed 1800 miles but still same problem. Seems intermittent though as can move along at 60-65 for a few minutes with no issues then might get a few "misfires"! Just doesn't make sense. Not always when pulling uphill either!
     
    Last edited: Aug 19, 2015

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