The timing belt tensioner pulley may make a squealing noise from the timing cover area on cold startup. An updated tensioner with a thicker mounting bracket to eliminate vibration may be needed to solve the problem.Google+
Car Problem Reports
Mazda Protege Squealing In Timing Cover Area When Cold
Mazda Protege Problem
Engines Affected: 1.5L 4 Cylinder, 1.6L 4 Cylinder, 1.8L 4 Cylinder, 2.0L 4 Cylinder
Average Mileage: 135,657 mi (60,000 mi - 250,000 mi)
Visitor, 1999 Mazda Protege, 1.6L 4 Cylinder, 100,000 mi
has not been fixed yet
Visitor, 1999 Mazda Protege, 1.6L 4 Cylinder, 190,000 mi
Oil leak suspected in wearing down / loosing alternator belt, eventually breaking altogether.
Visitor, 1996 Mazda Protege, 1.5L 4 Cylinder, 130,000 mi
My car usually squeals during a cold startup. I just replaced the belts and the squealing persists. From reading this, I am now suspecting that its the timing belt.
Visitor, 1999 Mazda Protege, 1.6L 4 Cylinder, 250,000 mi
A couple of times I have had to replace the belt.