Rough Running after Thermostat Replacement.

Discussion in 'Engine' started by SteveAshforth, Jan 26, 2017.

  1. SteveAshforth

    SteveAshforth New Member

    Messages:
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    Joined:
    Jan 22, 2017
    Car:
    C180K
    Hi all.

    This is my first post, so please forgive me if the answers I want are somewhere in the forum, but I've missed them.

    I have a 2004 c180k, with 109,100 miles on the clock. It's a 271 engine & It's run great in the 2 years I've had it.

    I've just replaced the Thermostat (yesterday) as the temp hardly ever got off the 40° mark & the heater was rubbish. It now gets to temp nicely & the heater works fine.

    While I was changing the Thermostat I noticed that the Air Intake Pipe, the 'cloth' one running across the front of the engine bay, was split at the Intake end (left side, looking rearward). I repaired it with some tape, making sure the pipe wasn't 'crushed'.

    I drove the car soon afterwards & all seemed ok. This morning however, it has been running like a dog: rough idle, general lumpy running & it cut out once. Then the Engine light came on. No faults are showing on the dash.

    My questions are:-

    A) Is it possible that the engine now thinks it's not getting enough air, since I repaired the pipe?

    B) If so will it sort itself out & start to run normally?

    C) Will the engine light stay on, or does it 'self reset'?

    D) Could it be another issue?

    Thanks in advance for any comments etc. Any info will be gratefully received.
     
  2. Yugguy

    Yugguy Hardcore MB Enthusiast

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    I had a couple of hiccups in the engine running soon after I changed my thermo. I put it down to the ECU having to relearn fueling after running cool for so long.

    It only did it a couple of times though and settled down and I didnt get any lights.
     
  3. OP
    OP
    SteveAshforth

    SteveAshforth New Member

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    Joined:
    Jan 22, 2017
    Car:
    C180K
    Thanks for that Yugguy.
    I'm hoping it's the old 'relearning' bit. I can't think what else it could be as nothing else has been touched.
    Being brought up on mini's, all this engine management stuff is 'White man's magic' to me. Lol!
     
  4. markmifsud

    markmifsud Hardcore MB Enthusiast

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  5. OP
    OP
    SteveAshforth

    SteveAshforth New Member

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    C180K
  6. martyz

    martyz Hardcore MB Enthusiast

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    The relevance of that link is your engine is one identified as a strong candidate for that

    serious problem...rough running is a flag for it,with a duff stat the engine will run richer

    masking the problem to a degree.I do hope this is not the case.
     
  7. OP
    OP
    SteveAshforth

    SteveAshforth New Member

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    Car:
    C180K
    Oh, I see. I'll read the thread again.
    What's the cure?
     
  8. martyz

    martyz Hardcore MB Enthusiast

    Messages:
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    A new timing chain and cam gears,cost, budget for upwards of £1.5k

    this is a worst case scenario_Of course a diagnosis of the fault from a reputable

    Mercedes independant specialist is the best way forward.Good luck.:thumb:
     

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