Noisy Acceleration after Timing Belt Change

timing-belts
belts
#1

I just had my timing belt and balance shaft belt replaced at a mechanic shop. After I picked up the car (01 Honda Accord) there is a very noticeable low hum when accelerating. The acceleration is sluggish. I requested to recheck the alignments of the marks and the belts? tension and they seems ok. What is going wrong?

#2

Good question. The engine should sound and run the same after a timing belt installation as it did before.

Did the mechanic replace anything other than the belts, such as the water pump or tensioner pulley?