First guess without seeing your car is that the alternator belt is too loose. That will make a screeching sound when you first start the car as the belt is cold as well as the alternator is under load to replace the juice you just sucked out of the battery cranking the car. If the timing belt was changed then all those belts were removed in the process. Easy to not tighten the alternator belt enough on some of the Hondas as well as Mazda and Mitsubishi. I would check there first. Also as mentioned in another answer the tensioner can do that as well as the water pump, which drives off the timing belt. Start with the easiest first though if the engine appears to run okay otherwise and has usual power. Check the alternator and other belts before tearing it back down. While you can tighten a timing belt too tight, it only shows up in reduced life of either the belt, or tensioner or water pump. Other than that too tight and the car will still run fine and should not make any undue noises if both tensioner and water pump are still okay. If you want a good "rule of thumb" on timing belts that works on practically any vehicle, when installing and after having tightened belt, take the side with the slack "tensioner side" and find the longest stretch of belt. Twist that with your hand and see if you can move it 90 degrees. In other words to where it is perpendicular to the way it should sit. If you can do that it is okay. If it will easily go past that point it is too loose, and if you can not get it to that point is too tight. Got that info a few years back from Gates Belts representative as well as some auto repair manuals give the same specs to check. Gives an easy way to check without any sort of "tension measuring" tools. Some manuals also give a "deflection" rate but seldom have seen that listed. The test "must" be done though on the side with the slack and not the drive side and also after having rolled the engine to make sure that it actually has the slack on that side.