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Old 10-13-2019, 01:46 PM
Ohioan Ohioan is offline
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Strange sound. Canít figure where it's coming from.

2006 Z4 3.0si with 70K miles. Six-speed manual.

Last Friday I started it up and heard a strange noise while just sitting there in neutral. Though I wouldn't describe it as a "noise." More like a "tone." Like a resonance of some sort. It's not loud; it's rather faint. Sort of sounds like a car horn randomly going on and off at low volume.

It can be heard inside and outside the car. I can't determine where it's coming from, but it seems to be slightly louder near the rear of the car.

The tone does not care if the clutch is pushed in, or if it's in gear. And it only seems to occur at idle. When I rev it up past 1000 RPM, it goes away.

I recorded it with my phone. Here it is (18 second 3gp file):

Last edited by Ohioan; 10-13-2019 at 03:35 PM.
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Old 10-13-2019, 03:31 PM
jb63 jb63 is offline
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Location: NW Michigan
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Mein Auto: Z4
Had the same thing on my 03 with 75K, thought it was the top motor, wrong, electric fuel pump.
Not cheap to fix.
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Old 10-14-2019, 05:11 AM
RJ237 RJ237 is offline
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Location: Georgia
Join Date: Oct 2011
Posts: 25
Mein Auto: 2004 Z4 3.0i
It could also be idler bearing for the belt or transmission throwout bearing.
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