E280 V6 cdi - MAF Cleaning Help Needed

Discussion in 'Engine' started by mystic.bertie, Jul 11, 2016.

  1. mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    I panicked and thought my low power and no auto kick down were the results of a gearbox problem, after much research i have read it could be a MAF sensor, which could be causing the 'limp mode' and no EML, which in turn prevents the auto kick down.

    So today i disconnected the 2 MAF sensors, the car went amazingly quicker than before. So i now want to clean the sensors with halfords electrical contact cleaner, i have used this in the past and its half the price of the MAF specific ones.

    So can anyone tell me how to remove the sensors for cleaning.

    cheers :thumb:
     
  2. Mr Filipov

    Mr Filipov Hardcore MB Enthusiast

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    With yours being the v6 all you can do is disconnect the clips on the back. There is no way of removing them as they are moulded into the inlet pipe. If the connector cleaner does not work for you I am aftaid it will be a whole pipe and it is a Mercedes only part. Not worth cheaping out on it just keep in mind it is close to £300.
     
  3. Gareth

    Gareth Hardcore MB Enthusiast

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    I'd also check the turbo seal and clean underneath where it sits whilst you are at it.
     
  4. OP
    OP
    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    Thanks for the replies guys. It's a bit of a bummer they can't be removed. I can't imagine I will get good enough access to the sensor but it's free to try.

    As I mentioned the car is much faster with the maf's unplugged. I have had jerky acceleration twice and it went into limp mode. Does this suggest it could be a turbo problem or are the maf's needing replaced too.. I am going to get a star diagnostic at mercland as I don't want to waste money on the wrong parts.
     
  5. Gareth

    Gareth Hardcore MB Enthusiast

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    I've had that a few times on mine although I don't recall having it since the car has been remapped, I periodically put WD40 on the actuator arm.

    But as said previously, I think it is crucial to ensure the turbo seal itself isn't perished and allowing oil / crud to build up underneath as this can affect the inlet port shutoff motor which will cause the car to go into limp mode, again I regularly ensure underneath the seal is clean and it is pressed against the turbo correctly to avoid these problems as I've had the inlet port shutoff motor replaced before because of this.

    I'm interested to hear how you get on cleaning / sorting the MAFs though.
     
    Last edited: Jul 13, 2016
  6. OP
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    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    I will try and locate the actuator arm and spray wd40 on it.

    Today i removed the tube with the maf's attached, it was easy, just 3 jubilee clips. There is 2 metal clips on each sensor, these can be popped off and the sensor can be removed easy. I gave them a thorough blast with the cleaner by spraying only, refitted them and refitted the tube. I cleaned the turbo seal as it was a bit grimy. I will see how it drives tomorrow. I took pics of each sensor as you might be able to buy them separately, i took pics of the part numbers.

    Because i have unplugged my maf sensor's i still have my eml light on, can this be reset or does it need to be done using star?
     
  7. Auto-mobile

    Auto-mobile Hardcore MB Enthusiast

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    Cleaning will not fix faulty maf sensors.

    I also doubt yours have failed/gone faulty especially on the v6 cdi, they don't fail.
     
  8. OP
    OP
    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    I have cleaned a few maf's in the past with good results but yes i agree if its faulty it wont fix it.

    Do you have any idea why after unplugging my sensors, my car goes much faster?
     
  9. OP
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    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    a6420940148

    This is the part number so you can buy a set sensor separately. Can I reset my EML without going to the garage?
     
  10. splitpin

    splitpin Hardcore MB Enthusiast

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    I lift/replace fuse No:11 on my W211.
     
  11. OP
    OP
    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    Is this to reset the EML? It has reset itself, it must take a few starts to put the light out. Im getting the star diagnostic done next week when it goes in to get a few suspension parts replaced.
     
  12. OP
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    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    Well its been more than 2 weeks and the jerky acceleration has not returned, when safe to do so i was flooring it. Fingers crossed it does not return. ;)
     
  13. WOODYTHEWISE

    WOODYTHEWISE Hardcore MB Enthusiast

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    Pleased you got it sorted..always good to see a happy ending.
     
  14. OP
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    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    Cheers. :D
     
  15. mfc911

    mfc911 New Member

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  16. Stratman

    Stratman Hardcore MB Enthusiast

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    When the ECU detects implausible numbers coming from the MAF it defaults to its built-in map. When the numbers are just about believable the ECU obeys them, resulting in poor running. By unplugging it altogether the ECU has no choice but to go to the default, which is no longer being modified by bad values.
     
    Last edited: Aug 25, 2016
  17. OP
    OP
    mystic.bertie

    mystic.bertie Hardcore MB Enthusiast

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    cheers bud, after cleaning the maf sensors have been fine. Im glad they dont need replaced ;)
     

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