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Registered
Join Date: Jun 2003
Location: Leonardtown, MD
Posts: 838
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odd noise
When im driving, at 3.6 rpms ( and only 3.6, nowhere else) i hear a buzzing sound. Like a dremel on a piece of metal, type sound... thats about all i know right now, just got in. Anyone have any clue what this might possibly be?
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1987 944 - Wrecked turned parts car 1986 944 - Awesome Auto |
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08-19-2003, 11:32 AM
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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,597
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A dremel?
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08-19-2003, 11:48 AM
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vott does ziss do?
Join Date: May 2003
Location: Seattle
Posts: 6,676
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handheld electric tool, similar to a drill. used for hobby type purposes and other drilling, grinding and cutting tasks.
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08-19-2003, 12:03 PM
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Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,935
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I think you may be exciting the natural frequency of something in the vehicle. Everything has a natural frequency. I have another vehicle that does it at about that speed. In my car (different brand) it is a piece of the fiberglass intake vibrating at its natural frequency and hitting the fiberglass fender liner. It is a sharp buzzing sound. A buzz because its frequency is high.
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Lawrence 1986 951 2002 SLK32 AMG 1987 328GTS 2011 528i |
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08-19-2003, 01:15 PM
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vott does ziss do?
Join Date: May 2003
Location: Seattle
Posts: 6,676
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I had a similar question on another thread a while back. I had a similar vibration at just under 4k but without any noise. it seems that all 944s sooner or later develop a vibration around 3.5 to 4k. that's probably what's making something else in the car buzz. as Lawrence said, there is probably something that's not quite screwed down right making the noise.
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08-19-2003, 01:23 PM
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Check the heat shield over the passenger engine mount. Has two small bolts that hold it on from the back side.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-19-2003, 03:58 PM
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Join Date: Jul 2003
Location: Austin, Texas
Posts: 138
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SoCal is probably on the right track. The heat shields back at the muffler or other components of the exhaust system (cat?) could be vibrating and resonating at that "frequency."
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bertman 84 944 Original Owner 65 Plymouth Satellite 08 Mercedes-Benz E 350 Sport |
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08-19-2003, 04:25 PM
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1983 Porsche 944 2.5 liter
