Error code 43 EGR system

Discussion in 'General Motoring' started by Boomerang, Apr 26, 2004.

  1. Boomerang

    Boomerang Guest

    After I read out the computer from my 94 excel I get the following error
    code: 43 EGR system

    Any suggestions how to solve this problem?
    Boomerang, Apr 26, 2004
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  2. Boomerang

    hyundaitech Guest

    Are the other error codes gone now?
    If so, check the temperature sensor in your EGR valve. The common problem
    is that it goes open and the computer sees something like -50C. I have no
    resistance specs, but the scan tool reading has always taken me right to
    the problem.
    hyundaitech, Apr 27, 2004
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  3. Boomerang

    Boomerang Guest

    Yes, the rest of the fault codes are gone so far. I'll see if I can check
    the temperature sensor. I'm not a supermechanic :D
    Boomerang, Apr 27, 2004
  4. Boomerang

    Boomerang Guest

    Can you tell me how I can check if the EGR valve is still working. I
    checked the vacuum hose and that one is sucking air if I set the engine to
    2500 rpm. But how can I see if the valve opens or closes correctly?
    Boomerang, Apr 27, 2004
  5. Boomerang

    Bob Bailin Guest

    With the engine off and cold, see if you can get your fingers near
    the stem of the valve and lift up the diaphragm to open it up. When
    it's open, use another finger or thumb to plug the nipple that the vacuum
    hose was connected to. With it plugged, the valve should remain open when
    you release the diaphragm, and it should snap shut when you remove
    your finger from the nipple. This means that the rubber diaphragm is in
    good shape and will respond to vacuum.

    Now start the engine, let it idle, and before it gets too hot, reach in and
    open the EGR valve again by hand. If it's working properly, the engine
    should sputter and/or stall, because of the excess exhaust your letting
    back into the engine intake. If the valve is clogged with carbon, nothing
    will happen when you open the valve.

    Bob Bailin, Apr 28, 2004
  6. Boomerang

    Boomerang Guest

    Can you tell me how I can lift up the diaphragm? The only thing I see is a
    solid metal cylinder/ball with a connection to the vacuum hose at the top
    and a connection to a sensor at the bottom of the cylinder. I don't see
    any part that can move. Can you tell me how I can see if the diaphragm
    moves or not.
    Boomerang, Apr 29, 2004
  7. Boomerang

    Bob Bailin Guest

    I'm more familiar with the older style without the sensor, but they
    should be pretty similar. The complete valve has a brass upper
    section with the vac hose connection that you mention, and a
    cast iron lower section that has the two bolts that hold it to the

    There should be a space between the two big enough to get
    your fingers into, and you should be able to feel both the
    diaphragm and the stem that controls the valve. A flat blade
    screwdriver may also fit in there. Just put your fingers in there
    and lift it up a quarter inch.

    If the design has changed to accommodate the sensor, you can
    just attach a piece of vac hose to the connection and suck on
    it to see if the diaphragm is intact. If it is, and if your lungs are
    strong enough, try it with the engine running to open the valve
    and stall the engine. Otherwise, use a vacuum pump or another
    source of vacuum at idle from the engine itself.

    Bob Bailin, May 1, 2004
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