2001 f150 lariat supercrew, noise changes pitch with the change in acceleration, cold weather is usually when it occurs, also had tune up and throttle body was cleaned. I never had the problem before, but only have owned truck since 165,000 mi, now had 171,000mi
Whistling can be the alternator bushes wearing out, or a failing belt on the engine. cold weather sound are more hearable as the damp air gets in to the parts on the belt or the alternator spray some wd40 in the alternator vents front and back of it, if sound go then that was the problem if not then the belt or the adjuster for the belt can be the problem. every year or so you should put some wd40 on parts in the engine helps to keep them water tight and stops damp getting in.
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