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1998 BMW 323

Tiny
JOEY JJ
  • MEMBER
  • 1998 BMW 323
  • 6 CYL
  • 2WD
  • MANUAL
  • 88,000 MILES
What is the unit that is in the left rear of the engine that is round and has a filter in it? This unit just started making a loud noise when the vehicle is first started it then shut off 2 minutes later. It never did this before. Can you help me!
Tuesday, July 15th, 2008 AT 9:31 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
That unit is the secondary air injection pump. It injects air into the exhaust manifold on start-up before the coolant temperature reaches a pre-determined level to quicken the catalytic converter start-up. They do make a whining sound sometimes and it does not always mean it is failing. If you are considering replacement the part# is 11-72-1-744-490 and should be available online from several BMW parts suppliers. Realoem. Com or BMWpartsonly. Com or European auto source (714)369-8524 just to help you get started.
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Tuesday, July 15th, 2008 AT 10:06 PM

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