What are the symptoms of a bad engine timing chain?

[VanMicah]

When the timing chain is faulty, it can cause engine noise, high fuel consumption, increased oil consumption, failure to start the car, lack of power, and severe exhaust emissions. The symptoms of timing chain failure and when it needs to be replaced are as follows: Symptoms of timing chain failure: Engine produces abnormal noise; High fuel consumption; Increased oil consumption; Car fails to start; Lack of power; Severe exhaust emissions. When the timing chain needs to be replaced: Check the elongation of the chain, replace if it exceeds the usable length; Inspect the wear of the car's camshaft and crankshaft sprockets, replace if it exceeds the usage limit; Examine the elongation, wear, or breakage of the timing chain, replace if damaged; Measure the thickness of the tensioner and chain damper, replace if it exceeds the usage limit.