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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 06-21-2004, 12:01 PM   #1 (permalink)
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I noticed this about a week ago: when I go down really long hills, I put the car in neutral to avoid excessive engine braking or wearing out the clutch throwout bearing. Since the engine is really quiet in neutral, I was able to hear a sort of buzzy sound coming from behind me. The other day I came home quickly to get something and left my car running in the driveway; when I got out, I could hear it, and tried to trace the noise. I ended up about halfway across the driver-side rear door. Something under there is making an odd sound whenever the motor is running.

My first suspicion is that it's some part of the exhaust system, but I have no idea what that is, and I'm getting new cam seals today, so I can't get up under there and look around at the moment.

I haven't noticed any slump in performance or economy, so if it is an exhaust issue, I don't think it's too serious. But man is it annoying. Any ideas on what it is and how it can be fixed?
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Old 06-21-2004, 01:24 PM   #2 (permalink)
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I've noticed the same sort of thing on my car. i think it might be a support bracket or something
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Old 06-21-2004, 09:55 PM   #3 (permalink)
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if it is a whining noise or hissing noise it probably is your auxilary fuel pump.
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