Replaced timing belt and put on four new tires on 2002 Audi A4. Now there is a vibration when idling and also between 40-70 mph that feels like engine is running rough, but tachometer holds steady.
Vibration occurs going up hilss, going down hills, but sometimes I can find a speed where I get no vibration.
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Chances are its a minor miss in one of the cylinders. You don't feel it neutral at idle or until the trans goes into overdrive because those times the engine is not working very hard. If it is a miss fire the check engine light will come on when it gets bad enough to affect fuel mileage. If you have not yet changed the plugs I would start with that. There is also a chance you damaged the engine when it overheated.
It sounds like either the balance shaft was in the wrong position when the belt was put on so now it isn't canceling the vibration. Or you were off a tooth or two when you put it back together. Pull the timing cover and check to make sure you are rite on the timing marks. If you are then you will probably have to take the belt off and rotate the balance shaft 1 time. Then put it all back together.
I would guess your two issues are separate. The squealing belt could be an adjustment problem or a wet or damaged belt. Belts can vary, how long they last. I have replaced them the next year on some cars and others could 3 or 4 years. The tire vibration could be related to the tire tread or some type of tire defect(a bubble in the side wall), may be an alignment problem. Check the steering components, tie-rods, ball joints, and wheel bearings.