Question about 1999 Ford Expedition
The whining noise is the Starter spinning without its end part, called a "Bendix Drive" working. The Bendix drive is the gear that goes against the flywheel to spin the engine when you turn the key to START. It is possibly the Starter bolts are loose and the gear is too far away from the flywheel to work. This is a very remote possibility.
On your Expedition there are 2 or 3 small wires on top of the Starter that make the Bendix work. With luck, the connections are the problem and cleaning or replacing the wire ends will make the Starter work. The connections go to another part of the Starter called a Solenoid.
There was a recall for the Starter wiring Harness around the time your Expedition was built. Contact a Dealer with your Vin# to see if it was done. Now the Solenoid I mentioned may have a Bad magnet inside it. You will not know until the wire connections are known to be good. It is important that the wiring is fixed first, because all the problems can be fixed with this 1 repair.
You will not have to pull out the Starter and replace it if the wiring repair works. Ideally an Electronic scanner should be used to diagnose any other problem that can be present. This device would show up my last concern, a bad crankshaft sensor. This part will cause the Starter to be overpowered and can temporarily bind the engine. The Starter will either "Kickout" in each starting attempt or jam the Bendix gear.
At the most, you will need a Starter, wiring repair and a sensor. At the least, just wiring repair. I hope you find my reply thorough and informative.
Posted on Sep 06, 2010
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Posted on Jan 02, 2017
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