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Thread: 2001 Z-3 loss of power

  1. #1
    Join Date
    Apr 2018
    Location
    amherst, ma
    Posts
    6
    My Cars
    2001 bmw z3

    2001 Z-3 loss of power

    When the outside temperature exceeds 90 degrees, my 2001 Z-3 (3.0) loses power. It still runs smoothly, but its loss of power feels like retarded spark. Any idea what might be causing this?
    Last edited by mrmoe; 10-03-2018 at 08:07 AM.

  2. #2
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,459
    My Cars
    36 Cylinders
    Any codes/ check engine light?

    Any modifications done to the engine?
    High air intake temperatures will cause some power loss due to air density changes, but not severe.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  3. #3
    Join Date
    Apr 2018
    Location
    amherst, ma
    Posts
    6
    My Cars
    2001 bmw z3
    No engine modifications and no engine warning lights on, but the power loss is significant.

  4. #4
    Join Date
    Jun 2011
    Location
    Springfield, Ohio, USA
    Posts
    1,233
    My Cars
    1998 Z3 Roadster
    My experience with a sudden dramatic loss of power with no codes was a clogged catalytic converter. Sometimes everything was fine and sometimes it was clogged due to a broken piece of ceramic. It finally set a code for a downstream O2 sensor.

    It could also be a bad DISA valve or a bad VANOS or bad VANOS seals. Those rarely set codes either, yet have a noticeable impact on power.

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