I have a 05 Jeep Wrangler Unlimited: every time I accelerate there is a loud squealing sound in my engine; I changed the tensioner pulley, idler pulley & Serpentine Belt. The sound is still there. What else could it be??
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How many miles? V6? Have you had a tune up(spark plugs changed..AT LEAST)? Should be changed about every 60,000 miles, according to the manual. Does your engine burn oil? Check your intake rubber tube, vac lines, pcv tube for crack. Hopefully your catalytic converter isn't the problem due to above...
You probably spun a bearing. My wifes 2000 ford mustang did the same thing she never checked the oil and she said the oil light would come on briefly and oil empty filled back and knocking during acceleration and idle tore apart motor and there were three spun bearings.
Try removing the belt and turning each pulley by hand. If everything is smooth and free, with the belt still off, drive down the block once and see if the noise is there (this will eliminate all rotating accessories on the front). If you hear the noise, then there is a problem deeper inside. Oil pressure is good? Dont' forget when doing this, you will have no power steering, so be careful.