1995 BMW 540I RPM DROP, CHECK ENGINE LIGHT

  • Tiny
  • 540iWILL
  • 1995 BMW 540i

Engine Performance problem
1995 BMW 540i V8 Two Wheel Drive Automatic 209000 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
  • 9,719 posts

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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