240 air mass meter

Discussion in 'Volvo 240' started by Beck, Aug 25, 2005.

  1. Beck

    Beck Guest

    Have checked the diagnostic console and it is giving a code for an Air Mass
    Meter problem. Looking in Haynes manual is difficult to know whether the
    air mass meter is the whole of that large pipe or just a part of it as the
    diagram is inconclusive.
    Could it be that the whole pipe needs cleaning or something similar?
    thanks.
     
    Beck, Aug 25, 2005
    #1
  2. Beck

    Tim McNamara Guest

    The AMM is a unit about 6" long that has wires plugged into it, with
    hose clamps on either side of it. There is the air intake box, a short
    length of flex pipe, then the AMM, then more flex pipe leading to the
    fuel injector unit. There is a 10 mm bolt holding the AMM onto the body
    of the car. You also should replace the air box thermostat at the same
    time as the AMM.

    Replacing the AMM is about a 10 minute job. The air box thermostat is
    kind of a pain in the tuchas.

    Lots of info on the Web:

    http://www.vlvworld.com/indexframe.html?200/Section_2_5.htm

    http://www.vlvworld.com/indexframe.html?VolvoRepairManual/Section_2_5.htm

    http://www.swedishbricks.net/faq/fiairmeter.html

    http://www.fcpgroton.com/volvo240b23fuelinjection.htm
     
    Tim McNamara, Aug 26, 2005
    #2
  3. Beck

    Beck Guest

    Thanks for your help. We are going to give it a clean first and see if that
    is the problem. No point in paying for it to be replaced if it just needs
    cleaning. I know the bit you mean though, not the pipe itself, but the box
    in the middle.
    Its possible its also a rogue code that has flashed up for no reason. My
    dad unplugged the car battery and replaced it again and the code has not
    come back on again today. Its going in for an MOT today gawd knows what they
    are going to find, we got conned by the salesman. Lets hope any fixes are
    minor.
     
    Beck, Aug 26, 2005
    #3
  4. You can test the air mass meter in place with an ohmeter. I believe your
    Haynes manual will tell you which pins to connect to and what to expect.

    In my experience, the AMM sensor code is probably not the AMM but an air
    leak in the big plsatic tube. Check it carefully, particularly in the ribs.
    A replacement tube is about $25, AMM is probably $350.
     
    Robert Lutwak, Aug 27, 2005
    #4
  5. Beck

    Tim McNamara Guest

    Especially the duct between the AMM and the injection system. Air
    getting in there will cause problems for sure.
     
    Tim McNamara, Aug 28, 2005
    #5
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