Why is the engine noise loud inside the car?
4 Answers
Here are the reasons for loud engine noise inside the car: 1. Weather conditions: Cold weather causes the engine idle speed to increase, and the cold engine maintains high RPM. 2. Loose plastic parts in the engine compartment: Such as the engine cover, intake pipe, etc., which can be fixed by tightening. 3. Incorrect engine oil condition: When the viscosity of the engine oil is too high, it can easily cause problems in engine operation, reduce lubrication, leading to friction during engine operation and resulting in noise. 4. Valve leakage: During the reaming of the valve seat, improper operation or excessive wear of the valve guide inner hole can cause the valve seat to tilt or the valve clearance to be too small, leading to valve burning and resulting in poor valve sealing and leakage.
When the engine noise suddenly increases, I always consider recent changes in the car's condition first. Possible causes vary: worn bearings can produce a harsh metal grinding sound; damaged engine mounts can transmit vibrations to the cabin; exhaust system leaks may sound like a 'hissing' wind; insufficient oil reduces lubrication and increases friction noise. Additionally, deteriorated soundproofing materials falling off can make the engine sound clearer. I recommend checking simple components first: see if the oil dipstick is at the normal level and if the air filter is dirty or clogged. If the noise is noticeable during startup or acceleration, it might be an issue with the ignition system or belts. For safety, visit a professional repair shop early for diagnosis to prevent minor issues from turning into major repairs. After all, a quiet drive is comfortable and safe. Remember, regular maintenance can effectively prevent such problems, such as changing the oil every 5,000 kilometers.
When I first started driving, I was also often bothered by engine noise, feeling like it was making my eardrums ache. Common causes include low engine oil levels, which make friction sounds more noticeable, or broken engine mounts, which allow vibrations to transfer directly into the cabin. If it's a 'humming' sound, there might be a crack in the exhaust system or poor sealing. I learned that detached sound insulation can amplify the noise. A simple solution is to check the basics yourself: pull out the dipstick to confirm the oil level and feel the engine bay temperature to see if it's abnormally high. If the noise is loud during cold starts but reduces after warming up, that’s normal. Don’t panic—most cases can be fixed by spending a few hundred dollars to repair the mounts or replace the sound insulation strips. I recommend finding time to visit a shop and have a technician listen to it, just to ease your mind and avoid affecting your driving mood.
From a cost-saving perspective, I'm not in a hurry to overhaul engine noise. Common minor issues like fast oil consumption causing insufficient lubrication can often be fixed by simply topping it up; a clogged air filter amplifying intake noise only requires a new one costing a few dozen yuan. Aging mounts or loose exhaust systems can be repaired with inexpensive parts. Belt wear noise is also easy to address. I always prioritize basic checks: testing oil levels and filter condition. Only if there's persistent loud noise would I consider checking bearings or piston rings. Don't be intimidated into expensive repairs - many noises stem from simple maintenance oversights. Weekly checks can save you big money.
