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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-19-2012, 02:18 PM   #1
Hbenmeir
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Join Date: Jul 2012
Location: Colorado
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What's wrong

My car is making a really high pitch wine when I first start it in the morning. Then it does it between 15-2500 rpm while driving now most of the time. It started doing it bad when I left one morning and it was 40 degrees out. It would do every once in a while before, only on first start of day then stop. Could this be a belt of some sort or perhaps alternator.
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Old 09-19-2012, 02:25 PM   #2
El Polo
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Secondary air pump?

Sorry if this post doesn't make sense. I am writing on a cell phone.
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Old 09-19-2012, 10:11 PM   #3
Hbenmeir
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Were and what is that never heard of that before. BMW thing.
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Old 09-20-2012, 09:23 AM   #4
Drewfus2101
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It is probably a pulley making noise. When the bearing are going out, they squeal when they are cold but don't when they warm up.
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Old 09-20-2012, 02:22 PM   #5
Hbenmeir
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It's coming from the driver side so would probable be safe to say alternator. I do live on a dirt roAd.
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Old 10-01-2012, 12:42 AM   #6
Beamer Creamer
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Dont waste money guessing and replacing. You can get a cheap stethescope and use open tube to listen to each pulley/idler. I know its old school but still best. Or some idlers you can use probe attachment and touch on unmoving parts should hear if its rough
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