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buzzing/scraping noise from engine bay at 2300-2500 RPM's 200 1990

posted by  someone claiming to be Tyler on  Mon Dec 10 14:15 CST 2007 [RELATED]

Hello,

I have a 1990 240 Sedan with about 130,000 miles and recently, when I get to 2300 rpms something from the engine starts buzzing and it stops buzzing after 2500 RPMS. It happens when speeding up or slowing down and it happens whenever I am between 2300 and 2500 rpms in all gears. It almost sounds like a bike with a playing card flapping against the spokes. I thought maybe the fan blades were hitting the shroud but I can't see any scraping or damage to either of them. Any suggestions?





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