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Can you give me more information on this snapping noise?Where on the vehicle is it coming from?Does the vehicle have to be moving, turning, braking, running...etc?
Just one more question?Does the vehicle have to be driven or does the noise happen as soon as the key is turned on or the engine started?
What engine does this Windstar have? There is a 3.0L V6 and a 3.8L V6. If you can get me the VIN#, I can check Fords database.
Thank you. Inspect the spark plug wires on the back side of the engine. If any are cracked, split or grounded out, the spark will jump to the metal closest to it instead of the spark plug and cause the snapping noise you are hearing.
Then there may be a bad intake valve spring which is allowing the intake valve to stay open and the noise is the rocker arm bouncing around.