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Thread: m30 engine problem

  1. #1
    Join Date
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    m30 engine problem

    Hi I have a 1990 535i, that has developed a jerking/bucking while driving. The car idles great and there is no hesitation when I rev it up in driveway. However, when I start driving the car jerks around 2k rpm. Sometimes, there is also a popping noise from the exhaust. When I floor it, the car goes smooth, but when I gradually bring it to 2k rpm the car bucks back and forth. New cps, dizzy cap and rotor, spark plugs and wires, fuel pump and filter etc.

    Any ideas?

    Thanks

  2. #2
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    hiss by my window
    "popping" from the exhaust would usually have me pointing at the ignition(is coil strong & gaps correct?) but seeing that you've addressed that I'd suspect a lean miss under load, vacuum leak.

    If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. - Mark Donohue

  3. #3
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    The problem randomly stopped...interesting

  4. #4
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    problem is intermittent... it is specifically at 2k-2.5k rpm when foot is steady on throttle

  5. #5
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Okay, have you checked the ignition system yet?

    Do you have a shop manual to tell the values you are looking for?
    Last edited by dworthy; 04-18-2019 at 03:40 AM.
    Darin
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  6. #6
    moroza's Avatar
    moroza is offline MORΩN ΛABIA BMW CCA Member
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