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Misfiring in the rain over 2000 RPM

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    Misfiring in the rain over 2000 RPM

    89' 325i. It's been misfiring in wet weather for a while anywhere above 2,000 RPM (generalization) under load. It does it intermittently through the revs after that. Now It's getting to the point that it misfires intermittently in all weather under judicious application of throttle. Where do I start to look to fix this?
    "Have no small wrecks. If you are going to loop out and hit something, hit it hard." H.S.T

    #2
    Key areas of inspection should be the distributor cap, CPS sensor and AFM sensor. If you do not have a brand new or refurbished CPS or AFM, You will have problems.
    Owner - Bavarian Restoration
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      #3
      keep it simple, start with plus, ignition wires, then like ^^^ said, distributor cap/ rotor are likely suspects. While aged electronics do have isses, in my professional experience, it's almost always tune up items. especially in wet + under load condition. Crank sensor failing sometimes has a long crank/ hard start condition so if you've noticed that as well, maybe start there but don't change that without checking ignition components.

      Run it in a dark garage (vented!) or at night and spray it with a water bottle and see if you can reproduce the misfire and see sparks grounding our on the valve cover or anywhere else.
      "In God we trust. All others must bring data." -W. E. Deming


      /// 1987 325is ///
      Past: 87 is, 88ix, 88 i, 87 ic, 89 ix

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        #4
        +1 on the tune up items.

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