1998 BMW 328 Cavitating

1998 BMW 328
49,000 MILES • 6 CYL • 2WD • MANUAL
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KITWE
  • MEMBER
  • 1 POST
When the engine warms up to normal it will start to rev too approx. 3000rpm then go back too normal idle rpm ( 900 ) then back up to 3000 then back to normal....up.. down..up..
Mar 6, 2009 at 3:45 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
There is a vacuum leak. Probably the air intake boot, inspect for tears or ripped areas.
Mar 6, 2009 at 11:25 PM
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