My mechanic (non Toyota) just changed my timing belt , water pump & belt tensioner .
Now I have issues with a buzzing vibration at various RPM's .
It's most noticeable inbetween shifts (manual) and some idle situations .
The vehicle runs fine , so there is no issues with the belt being mis timed .
The noise almost sounds/feels like a section of the exhaust pipe is vibrating on the frame .
I took it back to the mechanic and he had a 2nd look at it but found nothing out of the ordinary .
He wants me to drive it around for another week and bring it back when they have more staff on
hand so the can then go back into the belt assembly (5 hrs ) .

Any ideas ??
The timing cover is a 4 piece assembly that also has a baffle plate buried in there as well .
I think one of them is mis aligned or loose .