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Sedans BMW 3-Series BMW 3-Series Maintenance and Repair
4446 messages, Last post on Nov 29, 2009 at 12:04 PM
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This is a weird one. I have a 2001 325 CiC with 69K. This noise has been there for years. It only occurs when the car has been parked for about 12 hours, and cannot be heard once the morning temps are above around 60 degrees. 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 noise does not happen when I leave work each day. I guess because it's only parked about 8 - 9 hours. If it was a pulley, wouldn't it make noise all the time? Same for the belt? Any ideas are welcome! |
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Replying to: nbb (Mar 19, 2008 9:14 am)
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Replying to: nbb (Mar 19, 2008 9:14 am) 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.
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Replying to: kyfdx (Mar 19, 2008 9:36 am)
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Replying to: roadburner (Mar 19, 2008 10:31 am) If it is the tensioner, is there an easy fix for this?
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Replying to: nbb (Mar 19, 2008 10:58 am) 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.. |
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Replying to: nbb (Mar 19, 2008 11:00 am) 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. |
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