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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-22-2008, 07:10 PM   #1
enoc1975
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Join Date: May 2008
Location: North Hollywood, CA
Posts: 17
My Ride: 2000 bmw 323i
Talking how to tell if your idler pulley is bad?

hi all i have a 2000 323i and when i start it when its cold it shakes an makes a squeelyng noise. i was thinking it was the idler pulley but not sure. does anyone know how to tell if the idler pulley is going bad? it only does it in the morning and in the evening going home from work, but once the car is warmed up it stops but the car runs fine overall.
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Old 08-22-2008, 11:58 PM   #2
Stuttgart330
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Join Date: Dec 2007
Location: The Desert
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My Ride: 05 330CIC ZHP
to be honest - who knows... I just went thru all of this, with same symptoms as you.. I replaced the idler pulley, then tensioner (mine was hydraulic), and just today, replaced the water pump. Pump was replaced because even after replacing all pulleys, I still had the squeeling noise.... I'll hopefully now know if my noise is gone..if not, then the only thing left is the steering pump which is $$$$$$$....

The only way you can tell is to start replacing one part at a time...pulleys first... ..sorry for the "bad" news..
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Old 08-27-2008, 12:38 PM   #3
myksbmw
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I had the same thing happen, I went ahead and replaced the wate pump and it fixed the squealing. I have not yet replaced the idler pulley. I figure if I hear some more noise the idler pulley is the culprit
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Old 08-27-2008, 01:22 PM   #4
bimmershot
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Join Date: Sep 2007
Location: Lebanon
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My Ride: 323i
i guess the squealing sound is your lead to a faulty idler pulley. I changed mine last summer after the squealing became so apparent.

if i'm not mistaken and my memory isn't playing tricks on me, the sound was very obvious when the gear knob was in P or N (auto, obviously ) and barely audible when in D.


hope this helps
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Old 08-27-2008, 01:31 PM   #5
n2Bimmer
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get a stethoscope from pep boys and act like a doctor and listen your car.
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