An loose alternator drive belt may cause a growling noise in the engine area at low speeds (usually when accelerating from a stop). This is often mistaken for catalytic converter failure.
Average mileage: 100,000 (60,000–160,000)
Engines affected: 2.7L V6, 3.2L V6, 3.5L V6
12 people reported this problem
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sounds like a low groan
clunking growling rattling noises,no one seems to know why after struts, mounts bushings etc were replaced. does not do it with hi-way driving
suspect alignment problems with the alternator belt tensioner pulley. The outside of the belt shows signs of wear,and rubber residue on pulley and there is a vibrating noise or growling at low speeds when starting out from a stop. The noise goes away when the surpentine belt is removed. No solution yet