Uneven idle when cold 89 325i m20

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  • Frey
    Noobie
    • Feb 2021
    • 6

    #1

    Uneven idle when cold 89 325i m20

    Hello, I have a surging idle between 600 and 800 rpm when the engine is started cold. Once the vehicle is warmed up, the engine idles smooth at 700rpm but the engine still gallops enough (as if it has a performance cam) to cause the car to sway left to right when stopped at a traffic light. Anything above idle is fine. I’ve recently replaced the afm intake boot, ignition cap, rotor, coil, plugs and wires as part of a tune-up, and also had the afm rebuilt.

    Any suggestions as to where to look for the issue would be much appreciated.

    Thank you in advance!
  • ADEN
    Mod Crazy
    • Feb 2008
    • 620

    #2
    Idle throttle switch.

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