08-05-2015, 10:09 AM
Maybe not a problem. When the engine is cold the ECU schedules a higher idle RPM, amongst other things. Up around the 1600RPM mark. Maybe, in colder weather, when you refuel, the engine, or at least the point of temperature input, cools enough for this to take effect for a short period. After starting the residual heat plus the engine returning to normal operating temperature soon brings the idle speed to normal. That's my guess anyway.
Cheers
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