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[Solved] Mieczyslaw Mercedes Class 169 CDI 2008: Engine Humming at Idle Speed, 95,000 KM Mileage

krzysztofx2 10545 19
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  • #1 16747141
    krzysztofx2
    Level 8  
    Hello, honorable forum members
    I have a small problem with my mieczysław and the class is 169 cdi 2008, the machine has a safe mileage of 95,000 km, but sometimes at idle the engine gently waves. You can hear such hum, hum ...
    All filters replaced The engine has a lot of power
    The turnover on the indicator is approx.
    No lights are on
    It burns to the touch
    Nothing too bad happens after that
    What could it be?
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  • #2 16747323
    kilun1
    Level 10  
    It might be catching left air somewhere. Check the intake system for chafing





    Moderated By T5:

    A gasoline engine is not. Please read the thread carefully.
    3.1.11. Don't post messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.

  • #3 16772306
    krzysztofx2
    Level 8  
    Hello, the intake system is functional, the erg valve is cleaned
    And from time to time, mieczysław will make a slight wave when idling
    Gentlemen, maybe other suggestions
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  • #4 16772335
    jenusz11
    Level 20  
    most likely fault of the fuel pressure regulator
  • #5 16772348
    krzysztofx2
    Level 8  
    there are two regulators on both ends of the injection rail, I wonder which regulator is on the right or left
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  • #6 16772358
    jenusz11
    Level 20  
    one is a pressure sensor the other is a regulator
  • #7 16772366
    krzysztofx2
    Level 8  
    and which side is the regulator from the side of the tubular fluid reservoir
  • #8 16825148
    krzysztofx2
    Level 8  
    Hello
    Replacing the regulator did not give anything, it is the same as it was on a warm engine, from time to time mieczysław at idle is slightly undulating
  • #9 16864452
    krzysztofx2
    Level 8  
    Gentlemen, maybe any other suggestions for undulating these spins
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  • #10 16864630
    Dziarski Hank
    Level 34  
    Where are the diagnostic results? How can an engine be blindly repaired with so much control electronics?
  • #11 16865419
    krzysztofx2
    Level 8  
    I was no bugs there
  • #12 16865477
    Dziarski Hank
    Level 34  
    I am not asking about errors - air mass, EGR valve test, required and current injection pressure, corrections on injectors ...
  • #13 16865537
    krzysztofx2
    Level 8  
    Well, I didn't do that
    Because the car is running well and nothing is wrong, the lights are not lit.
    It's just that it annoys me
  • #14 16865626
    moto-kord
    Level 28  
    Dziarski Hank wrote:
    Where are the diagnostic results? How can an engine be blindly repaired with so much control electronics?

    krzysztofx2 wrote:
    Well, I didn't do that

    krzysztofx2 wrote:
    Because the car is running well and nothing is wrong

    But
    krzysztofx2 wrote:
    sometimes at idle the engine gently sways. You can hear such hum, hum ...

    Do a decent computer diagnostics.
    Dziarski Hank wrote:
    air mass, EGR valve test, required and current injection pressure, corrections on the injectors ...

    Greetings.
  • #15 16865710
    krzysztofx2
    Level 8  
    I'll go to the site
    I'll let you know how it turned out
    greetings
  • #16 16904515
    krzysztofx2
    Level 8  
    welcome back
    I was in a private Mercedes service on sd and du..pa only the mileage of 97,000 km was confirmed
    Injections OK, only error stored in memory (check component B2 / 5 HFM air mass meter signal line short circuit or break)
    The guy erased the error for which he charged 50 zlotys and it did not help
    Besides, there was one more symptom
    Such that not when on a warm engine at idle speed spontaneously increase the speed to 1000 rpm
    My question
    Gentlemen, can't the flow meter be damaged that these rotations wave so much?
    But how to check if it is operational?
    I think to myself as if I unplug the flow meter plug for a moment and see if the rotation would wave then
  • #17 16906060
    konrad_bugaj
    Level 16  
    I had such a case in w168. After replacing the cr pressure sensor and regulator, the problem disappeared. But I don't remember if there was a pressure error ?. I would suggest looking for a "foreman" who can assess the fluctuations in the set and current pressure. Ask, look, do not replace it with the proverbial dump. On websites, most are students. Not insulting the maestro, of course :) .
  • #18 16907194
    krzysztofx2
    Level 8  
    Hello
    I unplugged the plug from the flow meter and the car does not wave and how would it be livelier because when I connect the plug back it starts to wave and if something was choking the engine
    So this is probably going to be it
    Only if this flow can be cleaned somehow or it is better to buy a good used one because the price of new ones is expensive
  • #19 17044426
    krzysztofx2
    Level 8  
    Hello
    The thermostat was the culprit
    The thermostat was not fully closed and the temperature was rock solid
    When driving, the temperature never exceeded 80 degrees and at idle it dropped to a few degrees
    And then the computer went crazy and didn't fill up the fuel
    And now the temperature is constant at 90 degrees and the engine is warmed up and the wave has stopped

    I recommend everyone to replace the thermostat when it has a temperature below 80 degrees and not to listen to fairy tales that Mercedes have that because it is not true
    I close the topic
    greetings
  • #20 17046288
    krzysztofx2
    Level 8  
    Hello
    The thermostat was the culprit
    The thermostat was not fully closed and the temperature was rock solid
    When driving, the temperature never exceeded 80 degrees and at idle it dropped to a few degrees
    And then the computer went crazy and didn't fill up the fuel
    And now the temperature is constant at 90 degrees and the engine is warmed up and the wave has stopped

    I recommend everyone to replace the thermostat when it has a temperature below 80 degrees and not to listen to fairy tales that Mercedes have that because it is not true
    I close the topic
    greetings
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Topic summary

The discussion revolves around a 2008 Mercedes Class 169 CDI experiencing engine humming at idle speed, with a mileage of 95,000 km. The owner reports that all filters have been replaced and the engine has good power, but there are occasional fluctuations in idle speed. Suggestions from forum members include checking for air leaks in the intake system, inspecting the fuel pressure regulator, and performing comprehensive diagnostics to assess the air mass meter and injection pressure. A significant finding was that a faulty thermostat could cause temperature fluctuations, leading to erratic engine behavior. The owner confirmed that replacing the thermostat resolved the issue, stabilizing the engine temperature and eliminating the humming.
Summary generated by the language model.
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