This is a weird one - When I start the car - I hear a subdued "pop" from the engine compartment - and then the engine catches and starts right up. I have no problems starting - and engine runs fine w/o any other problems after it is started. Car has ~ 210K miles on it - has been well maintained and have had no major problems w/engine while I owned it (sincwe 110K). This "pop" started occuring about 6 months ago. It's not a backfire that can be heard as a loud bang from the exhaust - but rather a somewhat suttle "pop" that occurs just before the engine catches and starts.
Any ideas what might be causing this??
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