Re: <E36> What is this pump for?

["Gary Derian" <gderian@xxxxxxxxxxxx>]

Sounds like an electric air pump to oxidize the exhaust when the engine is
cold and the fuel mixture is rich.  Also gets the catalyst heated up to
operating temperature faster.

Gary Derian <gderian@domain.elided>
>
> I have a 96 328i. There is a pump/fan with a long air hose/snorkel coming
> out of it right behind my right front shock tower. I notice it
occasionally
> runs when the car starts and shuts off after a couple minutes. What does
> this unit do and how often should it run. It seems like I used to only
hear
> it every third or fourth time I started the car, now I am hearing it
almost
> every time.
>
> Thanks for an info.
>
> Dennis
> 96 328i sport
>
>
> > Dennis Jarchow
> > Engineering Systems
> > Deere Power Systems Group
> > Email: jarchowdennis@domain.elided
> > (319) 292 - 8575
> >
> >
>

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