Question about Mercedes-Benz C230

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WITH THE A/C ON IT MAKES MY CAR RUN RUGH.

MY CAR RUNS HIGH WITH THE AIR CONDITIONER ON AND IT RUN GOOD WITH OUT IT ON.

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  • kris vis
    kris vis May 11, 2010

    the idle ?? the motor???

  • Dave  C
    Dave C May 11, 2010

    That's normal, the A/C compressor puts a big load on the engine so the computer pushes the idle up when the system is on. As the car gets older, this becomes more noticeable because the engine has worn a little and becomes less efficient at idle. When you switch the system off, the engine doesn't have to work so hard to maintain a steady idle so it is much smoother and lower because the computer isn't pushing it up.

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A/c idle control soleinoid on car has adjustment capability.
trace wire from ac/unit to solenoid on side of fuel delivery system you can loosen retaining nut and adjust plunger to get correct idle speed under a/c load.

Posted on May 08, 2009

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