What are the signs that a car's timing belt needs to be replaced?

[McKaleb]

Signs that a car's timing belt needs replacement are as follows: Mild signs: The car may lack power and struggle to accelerate when going uphill; Severe signs: No idle speed, or the engine shakes violently at idle, the exhaust pipe makes a popping sound when accelerating, and occasionally the engine stalls with the popping sound; When the deviation is too large: The engine may not start at all. In some car models, you may hear a knocking sound inside the engine when cranking, which is the sound of the piston hitting the valve. Timing misalignment can cause many problems, mostly internal engine damage, and in severe cases, a major overhaul may be required.