Quick MAS Question

Discussion in 'Engine' started by logan26, Aug 9, 2006.

  1. logan26

    logan26 New Member

    Messages:
    5
    Joined:
    Feb 5, 2006
    My car has started to show the faults that seem to be common in mercs ie the MAS is on the way out. After reading the haynes manual and having a quick look under the bonnet i cant see it. I was wondering if anybody could point it out for me. I have attached a picture of a merc with the same engine view as mines and also a picture of what i think i am looking for.:confused:

    [​IMG]

    [​IMG]

    Any help would be great :D
     
  2. se97mlm

    se97mlm Hardcore MB Enthusiast

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    Location:
    Stuttgart
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    Hi,

    I think your merc is too old to have one, it's normally in the black pipe between the airbox and the bendy connection.

    Regards
    Matt
     
  3. timmy

    timmy Hardcore MB Enthusiast

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    Location:
    Cheshire
    Car:
    w202 Esprit.
    That looks pretty much like my engine. I assume you have an early w202. Mine is 1993 and does not have a MAS either. Get that radiator checked too, mine blew up today:mad:
     
  4. OP
    OP
    logan26

    logan26 New Member

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    Feb 5, 2006
    Its a 1995 C180. Any ideas on the fault then if it aint got a mas? All the same pointers ie engine runs fine and then out of the blue it runs really rough as if its gonna cut out. Turn the ignition off and it'll run fine again for a bit then rough again. Reading through earlier posts and all pointed to the mas and if mine doesnt have one the i can rule that out. :(
     
  5. timmy

    timmy Hardcore MB Enthusiast

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    Maybe the air filter is dirty, I don't know mate, am no mechanic .
     
  6. turbominor

    turbominor Member

    Messages:
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    Joined:
    Jul 24, 2005
    Location:
    evesham
    Car:
    W202 C180 Auto
    same engine bay as my 97 w202 c180. Mas sensor is on the back side of the air inlet pipe as shown by my arrow!

    [​IMG]

    carefull when you take it out as the clips break off easily
     

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  7. wongl

    wongl Hardcore MB Enthusiast

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    Location:
    Hong Kong
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    Are you sure this is the MAS? I thought it was the air temp sensor.
     
  8. Glenn Smith

    Glenn Smith Hardcore MB Enthusiast

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    Car:
    2000 c230k estate
    Your car doesn't have an maf sensor, it has a map (manifold absolute pressure) sensor fitted in the ecu, try checking the hose from the inlet manifold to the ecu.
     
  9. stats007

    stats007 MB Club Veteran

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    The combined ECU is very expensive.
     
  10. OP
    OP
    logan26

    logan26 New Member

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    Thanks for all the replys guys. The car is off to an AA specialist mechanic ie the guy the patrolman phone for help when there stuck, just found out a guy at works brother does this job. Will keep you posted as to the outcome ;)
     
  11. paulfoel

    paulfoel Hardcore MB Enthusiast

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    How'd u get on with this after?

    Just found your post - my 250TD is experiencing what I think are similar problems...
     
  12. OP
    OP
    logan26

    logan26 New Member

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    Changed the plugs and leads and ran fine for a month. Thought woohoo
    Then problem came back. Doh
    Does it rarely now. Usually when I am low on petrol or when I fill up at the local Morrisons petrol station.
     
  13. Dec

    Dec Hardcore MB Enthusiast

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