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1997 BMW 540i Underneath noises

Tiny
ALABAMA JOHN
  • MEMBER
  • 1997 BMW 540I
  • V8
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
When running at steady speed car sounds like its changing gears up and down constantly but looking at the RPM's staying steady its not changing gears. Transmission works fine and changes as it should.

Also rough roaring noise when cruising speed is steady and car not pulling but maintaining speed. Stops when gas is increased. Doesn't do it ever above 80 MPH.

May be two separate things.
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Saturday, July 17th, 2010 AT 9:55 AM

2 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Sounds like the transmission is pendulum shifting, it could be software.
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Sunday, July 18th, 2010 AT 1:38 AM
Tiny
ALABAMA JOHN
  • MEMBER
  • 2 POSTS
Dr. Hagerty,

Thank you for your answer.

If it is pendulum shifting, can the software be reset or what to do about the software?

Could it be the fan sensor or even the catalytic converters since I have 100,000 miles on them?
They are something aftermarket so my check engine light stays on.
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Sunday, July 18th, 2010 AT 12:15 PM

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