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I have the exact same problem. Sounds more like buzzing. It is indeed the DBW servo, and can be indicative of future failure. Was another thread called "bees in throttle body" or something like that. I emailed that thread starter and he said he unplugged his throttle body while car off but key in ingnition and electronics on. Then he replugged in and buzz was diminished and he has learned to live with it. I think mine is very annoying, havent yet tried his solution as am on vacation. It reminds me of a 1950s pinball machine when you hold the flipper button continuously. Annoying.
The other thread was started by cpeteod. Im likely going to drive til it dies, then buy replacement. From what I understand there is no complete cure except expensive total replacement of throttle body.
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2006 polar blue Elise, VF stage II, clam hinge, von Hep exhaust, HID, Zeitronix/Dashdaq (GPS, wideband O2, EGT, fuel+oil pressure), BWR fuel rail, moroso oil pan, HD SS clutch, RTV brace, green wire mod, harnesses, Oddysey 625, alpine pdx-5, jvc avx77 head unit, jl speakers, voltmeter on dash, custom gauge pod, etc.
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