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Thread: Solved my E34 surging problem...

  1. #1
    Join Date
    Jan 2007
    Location
    Hoover, AL
    Posts
    17

    Default Solved my E34 surging problem...

    ...it was loose bolts, all of them, holding the CPS in place. Getting to the pivot bolt behing the trigger wheel was a bitch. I had to unbolt the A/C compressor to get enough room - also a bitch.

    And all I had to do is search this forum for which things to check!

  2. #2
    Join Date
    Sep 2006
    Posts
    533

    Default

    So what was the surging like?

    Mine surges too. Partial, steady throttle at a steady speed. 200 RPM variation...surges.
    Atlanta, GA/Bloomington, IN, USA

  3. #3
    Join Date
    Dec 2005
    Location
    Mt. Vernon Ohio
    Posts
    260

    Default

    My surging was fixed with a new 02 sensor. Don't be a fool though and pay $90 like I did.
    1993 525iA M50TU
    Black on Black...need pics
    208,888 miles

  4. #4
    Join Date
    Jan 2007
    Location
    Hoover, AL
    Posts
    17

    Default Surging symptom

    It recently started to surge badly going up a ~15% grade at 40-50 MPH. It always did it on the highway as well, but only noticeable enough to be annoying.

    Since the latter is typically a symptom of a failing O2 sensor, I replaced that first. (According to the records, it had never been changed)

    That wasn't it.

    I then tested the TPS and found the part throttle contact to be intermittant. It just sat there on my workbench, connected to an ohmmeter, fluctuating. I replaced that next. (According to the records, it had never been changed)

    That wasn't it.

    So I searched this website for "surging". The gap appeared to be within spec but when I checked the bolts, all three were loose.

    THAT was it.

    I don't feel I've wasted any money replacing the O2 & TPS sensors because they were both bad, and I was doing a major tune-up anyway.

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