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Thread: 1998 BMW Z3 1.9 Noise Before Startup Question

  1. #1
    Join Date
    Oct 2017
    Location
    Roseburg, Oregon
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    1998 BMW Z3 1.9

    1998 BMW Z3 1.9 Noise Before Startup Question

    New owner question. I've never owned a Z3 before so I don't know what I'm hearing.

    When I put the ignition in the start position - before I start the motor- there is a buzzing noise that comes from the front top of the motor. I think it's called the ADS, but I'm not sure.

    It sounds like a buzzing sound like a little motor is turning. The little motor buzzing sound will continue until I start the engine. It will then stop buzzing after the car engine starts.

    Is this a normal function of the Z3 or am I getting ready to have problems with my car.

    Thanks for helping.

  2. #2
    Join Date
    Oct 2012
    Location
    Louisville, KY
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    4,503
    My Cars
    1997 BMW Z3 1.9L 5MT
    Could be normal, the SAP, secondary air pump.
    My 1997 1.9 does not have one, thankfully.
    I don't know of the SAP comes on before starting, but it goes off soon after starting.
    BMW MOA 696, BMW CCA 1405

  3. #3
    Join Date
    Oct 2017
    Location
    Roseburg, Oregon
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    My Cars
    1998 BMW Z3 1.9
    I got the stethoscope out and the buzzing sound seems to be coming from the Idle Air Control Valve. I don't understand if the buzz is caused by a mechanical component inside the Idle Control Valve or if it is electrical energy resonating. Is this normal? Help.

  4. #4
    Join Date
    Oct 2012
    Location
    Louisville, KY
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    4,503
    My Cars
    1997 BMW Z3 1.9L 5MT
    Quote Originally Posted by Gloryb2Him View Post
    I got the stethoscope out and the buzzing sound seems to be coming from the Idle Air Control Valve. I don't understand if the buzz is caused by a mechanical component inside the Idle Control Valve or if it is electrical energy resonating. Is this normal? Help.
    The valve is electrical.
    https://www.ecstuning.com/b-genuine-...e/13411435846/
    If the idle is OK, the valve must be OK.
    BMW MOA 696, BMW CCA 1405

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