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BMW 3-Series Maintenance and Repair

4446 messages,  Last post on Nov 29, 2009 at 12:04 PM

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What is this discussion about? BMW 3 Series, Sedan

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#3820 of 4446 Re: Weird noise at startup. [nbb] by roadburner Mar 19, 2008 (10:31 am)
Replying to: nbb (Mar 19, 2008 9:14 am) About two or three seconds after the engine first starts, I hear a scraping noise that almost sounds like a belt or pulley. When I put it in reverse, I hear the noise while backing out of my garage. But once I go forward a short distance it goes away and does not return until the car is again parked overnight.   The belt tensioner on my 3er does the same thing. It's made the noise for a couple of years and I've been to lazy to fix it. Replies to this message: nbb (Mar 19, 2008 11:00 am) roadburner (Mar 19, 2008 11:47 am)
#3821 of 4446 Re: Weird noise at startup. [kyfdx] by nbb Mar 19, 2008 (10:58 am)
Replying to: kyfdx (Mar 19, 2008 9:36 am) Doesn't seem to be related to pressing the brakes. Would it rust that fast? Replies to this message: kyfdx (Mar 19, 2008 11:12 am)
#3822 of 4446 Re: Weird noise at startup. [roadburner] by nbb Mar 19, 2008 (11:00 am)
Replying to: roadburner (Mar 19, 2008 10:31 am) If it was tensioner, wouldn't it make the noise all the time?   If it is the tensioner, is there an easy fix for this? Replies to this message: roadburner (Mar 19, 2008 11:47 am)
#3823 of 4446 Re: Weird noise at startup. [nbb] by kyfdx HOST Mar 19, 2008 (11:12 am)
Replying to: nbb (Mar 19, 2008 10:58 am) They definitely get surface rust, overnight...   You said you heard it when you backed up.. My driveway is a little downhill to the street, so my brakes are applied the whole way down..   But, if you hear it on start-up, that probably isn't it..
#3824 of 4446 Re: Weird noise at startup. [nbb] by roadburner Mar 19, 2008 (11:47 am)
Replying to: nbb (Mar 19, 2008 11:00 am) If it was tensioner, wouldn't it make the noise all the time?   Not necessarily, the tensioner is fluid damped and the belt is a rubber composite. Both are stiffer at low temperatures.   If it is the tensioner, is there an easy fix for this?   Yes. Replace it. That said what you or your mechanic should do is remove the belt, let the car sit overnight and start it in the morning. No noise means that you have isolated the cause of the problem.
#3829 of 4446 Posts moved by pat HOST Mar 21, 2008 (12:32 pm)
Here's the link: JingleJill, "BMW 3-Series Tires and Wheels" #142, 21 Mar 2008 10:40 am.

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