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I suggest that you take the starter motor to an accredited auto electrician as it indicates a dry joint problem in the armature bars
the fix is
the bars can be re-soldered
or My preference -- a new armature
The hum is likley your fuel pump priming the fuel delivery system. I would start looking at the wiring coming from the Throttle Position Sensor. With the key in the ON position, you should be getting a 12vDC (or a little higher) signal to one wire and an excellent ground on another (usually the center if there are 3). If you are missing a good ground or the 12v signal, there lies your problem. Good luck.
I would start looking at the little things first, like fuses and relays. If their ok, then I would check to see if the fuel pump is kicking on. It ususaly will make a humming sound, for a second or two, then it cuts off.
Possibly a leaking head gasket. Water/antifreeze seeps into the cyllinder when it cools off, and then it won't fire properly until the coolant is blown out the exhaust when you start it. Let it warm up with the rad cap off. If you see bubbles continuously coming up to the filler hole, you have a head gasket problem. Do you have to add coolant monthly, or weekly?
If you're lucky, it could be just a spark plug that doesn't want to do anything until it warms up, or it could be a valve.