1995 BMW 540i rpm drop, check engine light

209,000 MILES • V8 • 2WD • AUTOMATIC
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540IWILL
  • MEMBER
  • 1 POST
Engine rpm drops abnormally quickly. Check engine light illuminates if rpm not maintained above 1,800rpm. Trouble codes for Lambda 1 and 2, O2 sensors 1 and 2, mass air flow sensor - all present as
retrieved by bavarian autosport scan/reset tool. If codes are reset - car acts normal until rpms are allowed to drop below 1800 rpm for more than 10 seconds. Then car runs very roughly until reset with tool - and cycle repeats. Worse in cold weather.
Jan 10, 2010 at 4:33 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Has the PCV plate been replaced? Are the intake gaskets all original?
Jan 11, 2010 at 12:41 AM
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