Obviously, it could be your starter. Another possibility is it could be noise from the auxiliary air fan, which when the car is cold blows air into the exhaust manifold to promote secondary combustion and lower emissions. This fan turns off after about 3 minutes of operation and doesn't turn on again at starting until the motor is cooled below a threshold temperature. Mine makes noise on starting sometimes, more of a whining sound.
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Paul B. Anders / Phoenix, AZ
1970 Porsche 914 / 2003 Porsche Boxster / 2009 Honda Fit Sport Auto
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