1995 BMW 540i RPM drop, check engine light

Tiny
540IWILL
  • MEMBER
  • 1995 BMW 540I
  • V8
  • 2WD
  • AUTOMATIC
  • 209,000 MILES
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.
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Sunday, January 10th, 2010 AT 12:33 PM

1 Reply

Tiny
DR. HAGERTY
  • EXPERT
Has the PCV plate been replaced? Are the intake gaskets all original?
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Monday, January 11th, 2010 AT 8:41 AM

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