How to Soundproof Excessive Engine Noise?
3 Answers
Here are the methods for soundproofing excessive engine noise: 1. If the engine noise is very loud and you want to soundproof it, you can install soundproofing cotton on the engine cover, which can effectively block a portion of the noise. You can also install soundproofing cotton inside the car doors to block some of the noise as well; 2. There are many reasons that can cause excessive engine noise, and some cars' engines are noisier by design when they leave the factory; 3. Most noisy engines are direct-injection engines. Many direct-injection engines make a ticking sound during operation, which is actually normal—it's the sound of the high-pressure fuel pump working.
Last time I did soundproofing on my old Sylphy and finally got the hang of it! Focused on the engine bay and firewall—stuck aluminum foil sound insulation directly inside the hood, making sure not to block the cooling vents. Then removed the dashboard to apply damping mats on the firewall, which was a hassle but had the most noticeable effect. Finally, added sealing strips to the door frames, making the 'thud' when closing much more solid. Don’t forget to stuff sound-absorbing cotton in the spare tire well—it cut the booming noise from the chassis by half. Spent 400 yuan on materials, and now on the highway, we don’t have to shout to chat anymore. Even turned the music volume down from 15 to 8 and still hear it clearly.
Just solved this issue: replacing hydraulic engine mounts works best! When rubber parts in old cars harden, engine vibrations directly transmit to the cabin. Remember to buy vehicle-specific models and don't cheap out. You'll need a jack to support the engine during removal/installation. Also check if exhaust pipe hangers are cracked - my Focus had exhaust resonance due to broken hangers. Switching to quiet tires can reduce noise by 3dB too; with less tire noise, engine sounds become more noticeable. After these three fixes, now the steering wheel doesn't vibrate at idle, and only makes muted sounds above 3000 RPM.
