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89 240 Air Mass Meter 200

posted by  zimm3 on  Wed Jun 27 12:50 CST 2007
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last visit: Thu Sep 11 13:08 CST 2014
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My car began running really badly a couple of days ago. Wouldn't idle, big stumble at all speeds, had to feather the throttle to make it move at all. Seemed to steady off at about 3,000 rpm but was still weak.

After looking at the FAQs, I disconnected the air mass meter. It immediatly started and idled at about 1,200 rpm. It still stumbles, but not as badly.

This is a bad air mass meter, right?

Just looking for confirmation before replacing an expensive bit.

Thanks

Zimm







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    89 240 Air Mass Meter 200

    posted by  zimm3 on  Fri Jun 29 01:06 CST 2007
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    last visit: Thu Sep 11 13:08 CST 2014
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    OK, got the correct AMM from a parts yard yesterday. I also found that the thermostat in the air box was holding the flap open that allows air from the exhaust manifold to enter. Thats probably what killed the AMM.

    Install the part, fire up the car, runs fine. Fixed a crack in the exhuaust at the catalytic convertor flange and took it for a test run. Ran fine, no more exhaust leak, great.

    This morning. Cranks but no start. $%&@%$%&^#W$!!!

    The fuel pump relay was replaced about 5 years ago. The crank sensor about 2 years ago. Plugs are fresh, coil is new. Cap and roter are in good shape. Plug wires are about 3-4 years old. Weather conditions were still and damp with lots of humidity. The 25 amp fuse looked good.

    Any thoughts?? Mine are running to large hammers.

    Zimm







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    89 240 Air Mass Meter 200

    posted by  pageda on  Wed Jun 27 13:49 CST 2007
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    last visit: Fri Oct 24 13:18 CST 2014
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    When I had an AMM fail it would not start. If you disconnect the connector (key off) the engine will idle fine but stumble and drive poorly, this is a limp home mode. And I mean limp home. Dan








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    89 240 Air Mass Meter 200

    posted by  CalW on  Wed Jun 27 13:30 CST 2007
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    last visit: Sat Sep 3 15:39 CST 2011
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    Clean it before you replace it. Get CRC Mass Air Flow Sensor Cleaner or similar, pull out the amm, spray the heck out of the inside of it until the gunk all drips out. Worked wonders on two of mine. Hate to think how many amms have been replaced needlessly. If it doesn't do the job, you're out $5 or $6 for the effort, and you have the peace of mind of knowing you need a new one.







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      89 240 Air Mass Meter 200

      posted by  spasske on  Fri Jun 29 05:31 CST 2007
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      last visit: Thu Oct 23 10:11 CST 2014
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      I used it on my AMM and I seemed to have regained 1-2 MPG. Good stuff! Also use an electrical cleaner (DE-Oxit from radio shack is highly recommended) on the connector. May be all you need.
      --
      Paul NW Indiana '89 740 Turbo 128,000








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    89 240 Air Mass Meter 200

    uid 34776's pic
    posted by  Ryan_R on  Wed Jun 27 13:00 CST 2007
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    last visit: Tue Sep 24 13:46 CST 2013
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    Sounds like typical AMM failure. Before buying a new one, just get a couple used ones. One for now, one in the trunk for later. A lot cheaper than a new one.

    -Ryan
    --

    Athens, Ohio
    1990 245 DL 133k M47, Cibié E-codes, Now with working wipers!
    1991 745 GL 290k (Girlfriend-mobile)
    Buckeye Volvo Club








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      identifying used 200

      uid 25912's pic
      posted by  Sven's Maintainer on  Thu Jun 28 01:53 CST 2007
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      last visit: Sun Sep 16 20:44 CST 2012
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      My local yard had hopelessly wrong information in their cross reference book when I needed an amm.

      Look at the last 3 digits on the # on the amm. I believe for the '89's with auto trans it's 017. That's what you need to match when you pull a used one. Should be any amm from a 240 '89-'93. Likely that non-turbo late 740s will also have what you need. Check fcpgroton - look up their part # information for 240s and 740s.
      --
      Sven: '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245 NA stock. 90 244 NA spare, runs.








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        identifying used 200

        uid 34776's pic
        posted by  Ryan_R on  Thu Jun 28 09:12 CST 2007
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        last visit: Tue Sep 24 13:46 CST 2013
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        Actually, only turbo 740/940's are likely to have the -016 AMM outside of California (said in my best impersonation of Hanz and Franz).

        Most non-turbo 740/940's got the Regina FI system, so no AMM. Whereas later turbo's will have LH 2.4, and the -016 AMM. California models 240/740/940 should have LH 2.4 w/EGR... and I believe that also has the -016 AMM.

        Supposedly, older LH2.2 (-007??) AMM's will work in later 240's. Haven't tried it myself...

        I can say that the gnarly used $40 replacement AMM I put in my 240 a year and a half ago is still going pretty strong, and I've got another one on the shelf for when it does fail. There's just no sense in buying a brand new Bosch AMM (at $400 a pop) until the used supply runs dry.

        -Ryan

        --

        Athens, Ohio
        1990 245 DL 133k M47, Cibié E-codes, Now with working wipers!
        1991 745 GL 290k (Girlfriend-mobile)
        Buckeye Volvo Club







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