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Old 11-13-2012, 04:11 PM   #16
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Join Date: Aug 2012
Location: Clemson, SC
Posts: 1,454
My Ride: 2001 BMW 325i ZSP
The high idle is caused by the Secondary Air Pump which allows the cat to heat up faster (an emission issue). European cars, imo, do not have the pump. Also, there is this thing called fast idle and slow idle. It fast idles immediately after you come to a rest. During extended stops with the engine running, it should drop to slow idle.
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