Why did the car engine suddenly become louder?

[IrisLynn]

Cars' engine suddenly becoming louder may be due to the following specific reasons: 1. Clogged fuel line: Poor quality fuel can cause the fuel line to clog, leading to excessive noise during engine operation. In this case, it is necessary to replace with high-quality fuel. Generally, flooring the accelerator can cause a large amount of fuel to spray out, allowing the engine to gain power, but this should not be done frequently. 2. Engine knocking: A sound similar to metal knocking, also known as piston slap. This may be due to incorrect engine timing control, such as an excessively large ignition advance angle. Readjusting the timing can restore normal sound. Alternatively, it may be caused by excessive carbon deposits inside the engine. You can first try carbon cleaning through no-disassembly cleaning or high-speed driving. 3. Engine misfire: One cylinder not working, causing engine imbalance and abnormal noise, accompanied by severe engine shaking, insufficient power, and other faults. This may be due to failures in the ignition module, spark plug, or fuel injector. Replacing the corresponding parts can resolve the issue.