What to Do About Loud Engine Noise?

[MacZoe]

The solutions for loud engine noise are: 1. Install some high-grade sound-absorbing foam materials on the engine cover to suppress vibrations caused by the hood; 2. Inspect and replace the intake and exhaust pipes if necessary; 3. Use insulated pistons to increase the combustion chamber wall temperature, shorten the ignition delay period, and reduce combustion noise in direct-injection diesel engines with space atomization combustion systems. An engine is a machine that converts one form of energy into another, typically transforming chemical energy into mechanical energy. The function of an engine is to convert the thermal energy of gasoline into mechanical energy by burning it in a sealed cylinder, where expanding gases push the piston to perform work, thereby providing power for the vehicle.

[EllieMarie]

I also encountered the problem of engine noise like a tractor some time ago. After inspection, several common causes were found: the engine oil hadn't been changed for too long and turned into paste, and it became much quieter after replacement; the engine mount rubber pads were aged and cracked, causing a clanking sound when going over speed bumps; and there was an exhaust system leak, with the exhaust pipe gasket burned through, producing a puffing sound. When repairing the car, the mechanic used a stethoscope to locate the source of the abnormal noise, which was very effective. For example, worn valve lifters produce a ticking sound, and a stretched timing chain makes a metal friction noise. Remember to also check the belt tensioner pulley—if the bearing is damaged, it sounds like whistling. Loud noises during cold starts are normal, but if it's still noisy after the engine warms up, you need to pay attention.

[SanCharlie]

Having repaired cars for over a decade, when encountering loud engine noise, first check three things: engine oil, engine mounts, and exhaust. Last time, a car owner complained that acceleration sounded like driving a tractor—upon inspection, all engine mounts were shattered, causing the engine to directly hit the frame. Recording abnormal sounds with a phone video is very helpful; if mechanics hear metallic knocking, it’s likely connecting rod bearing wear, while a whining noise could indicate turbocharger bearing issues. For older cars, especially check the hydraulic lifters—lack of oil causes a ticking sound. DIYers can check the oil dipstick; if it’s black and clumpy, it’s time for a change. Loud modified exhaust notes aren’t a fault, but a sputtering sound definitely means an air leak.

[SanAutumn]

Don't panic about engine noise as a beginner. First identify the source: strong steering wheel vibration likely indicates engine mount issues; increased noise when accelerating sharply suggests exhaust manifold gasket problems; squeaking with AC on usually means compressor belt aging. Recently helped my cousin fix similar resonance caused by loose air filter box screws. For turbocharged cars, check intercooler piping - hissing indicates air leaks. Using genuine engine oil reduces noise, while incorrect viscosity may cause chain-like friction sounds.