My Nissan Micra 1.3SLX 16 valve has developed a high pitched whine in the engine. A mechanic seems to think it is a dry bearing either the water pump or the power steering, but having oiled and/or greased all the parts it hasn't made any difference. I find that when the car has been standing for a few days and I drive it it doesn't start for about 5 miles. If I use it every day it starts whining immediately I start the engine. While I'm driving I find that if I put my foot down (about half way) on the accelerator, the whine stops and starts again when I release pressure on the pedal. Do you think it might be something to do with the petrol/accelerator? I would be grateful for any ideas.

Many thanks

Kellyanne