If the battery was recently disconnected or run dead, the Engine Computer has to relearn "minimum throttle" before it will know when it must be in control of idle speed. To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals. Until minimum throttle is relearned, you also won't get the nice idle flare-up to 1500 rpm when you start the engine.
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Wednesday, February 2nd, 2011 AT 1:43 AM