How to Deal with Loud Diesel Engine Noise?
4 Answers
Methods to address loud diesel engine noise are as follows: 1. If the car has difficulty starting and the engine noise is loud, clean the fuel system and check if the idle speed motor has carbon deposits that need cleaning. 2. For ignition system issues, inspect the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate spark plug firing can also lead to such faults. Check if the spark plugs have excessive carbon buildup and replace them if necessary. 3. Unstable oil pressure. If you have already cleaned the engine carbon deposits, cleaned the throttle body, replaced the oil pads and spark plugs, but still notice body shaking at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor for normal operation. If the fuel pump supply pressure is abnormal or the intake pressure sensor values are incorrect or malfunctioning, it can cause body shaking. Check the oil pressure and replace components if necessary.
My diesel car has been running for two or three years, and recently the engine noise has become alarmingly loud, much worse than the usual humming. A friend suggested I check the engine oil, and I found that cheap oil was used during the last oil change, leading to poor combustion due to low-quality oil. I tightened the belts and screws myself, but the noise didn’t completely go away, so I took it to the repair shop. The mechanic said it might be due to clogged fuel injectors or an exhaust leak. After replacing the parts, it became much quieter. It’s important to use high-quality engine oil, avoid filling up with poor-quality diesel, and regularly clean the fuel system to prevent issues. Excessive noise can be distracting, especially on highways, which is particularly dangerous. It’s best to fix the problem early to prevent further damage and save on repair costs.
Having driven diesel vehicles for over a decade, I've encountered plenty of noise issues. It's usually caused by loose engine mounts or worn components, such as problems with the crankshaft or gears. Back when I drove old trucks, sudden noise increases would prompt me to check the oil pump and filter – replacing dirty ones often brought immediate improvement. Don't overlook minor details; worn fan bearings or belts can also create significant noise. Persistent noise can increase fuel consumption and wear down the engine's core components. I make it a habit to service my vehicle every six months, using high-quality lubricants and ensuring proper sealing. Safety comes first – when noise becomes excessive, don't push your luck; seek professional diagnosis promptly to avoid major repairs.
I enjoy tinkering with my car. If the diesel engine is noisy, start by checking the simple things. See if there's enough fuel in the tank, as low fuel or poor-quality fuel can cause noise. Tighten any loose chassis bolts with a wrench. If the air filter is dirty, clean it and see if that helps. If the belts are old, replacing them yourself might reduce the noise. But don't mess with the internal parts. If the noise persists, take it to a repair shop—it might be a fuel injection system issue. Regular checks can prevent small problems from becoming big ones.
