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'01 Pathfinder - weird whistling engine sound
I own a '01 Pathfinder which I bought used around 2 years ago. So far I am very happy with it except that while I am driving it any where between 40mph to 50mph, I hear weired hollow whistling sound. This happens only when I have applied pressure on the gas paddle. This sound remains there till the truck is accelerated to 50mph...After that, the same thing happens again from 70mph to 80mph.
Has anyone experienced such a thing before? Any suggestions as what should I be looking for in order to troubleshoot this thing.
Btw, it is an LE 4x4 version of '01 pathfinder.