fast idle when first starting with battery warning light on

Asked by Jun 10, 2017 at 02:53 PM about the 2002 Ford Taurus SE Wagon

Question type: Maintenance & Repair

when i first start the taurus, 2002, 3.0 it runs fast idle and the charging system
warning light is on.  Sometimes I can kick it down to normal idle 600-700 rpm,
and the light will go off.  sometime after i drive it a mile or so the idle kicks
down and the warning light goes off.  

1 Answer

855

I'd say the alternator may be on it's way out but would check output voltage at alternator first. Engine may be trying to compensate. Other things I would do is to clean the throttle body and load test the battery. These two things (battery/alt) seem to go around the same time. Nothing worse that a weak battery especially during the cold months. Good Luck!

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