Engines aren’t silent, but they shouldn’t suddenly get louder, rougher, or make unusual noises. If you hear knocking, rattling, hissing, or squealing sounds from under the hood, it could be a sign of an issue that needs immediate attention. Some engine noises stem from minor problems, while others could indicate serious mechanical failures that lead to costly repairs if ignored. Recognizing the cause on time will help you prevent major engine damage and expensive fixes.
Common Causes of Engine Noise
Engines make noise naturally, but changes in sound usually mean something is wrong. The type of noise you hear can point to different underlying problems, from simple fixes to severe issues.
Exhaust System Leaks and Muffler Damage
A louder-than-normal engine often means something is wrong with the exhaust system. This system reduces engine noise, directs exhaust gases safely away, and improves performance. If there’s a leak in the exhaust manifold, pipes, or muffler, the sound-dampening effect is lost, causing a deep roaring or rumbling noise.
Muffler damage can make your engine sound aggressively loud, especially during acceleration. In some cases, a loose exhaust component may rattle while driving. Beyond the noise, a failing exhaust system can decrease fuel efficiency, harm engine performance, and release toxic fumes into the cabin.
Loose or Worn Belts
A squealing or chirping noise under the hood is usually caused by a worn-out or loose belt. The serpentine belt controls essential components like power steering, the alternator, and the air conditioning compressor. If the belt slips or becomes misaligned, it produces a loud, high-pitched sound. If ignored, the belt could snap completely, causing major issues like power steering failure or engine overheating.
Low Oil and Engine Friction
Oil lubricates engine components, preventing metal parts from grinding against each other. If the oil is low or too old, you may hear knocking, ticking, or grinding sounds due to increased friction inside the engine. Over time, running with low or dirty oil can cause permanent internal damage, leading to costly repairs.
If you hear these noises, checking and topping off the oil immediately might help, but long-term neglect could result in major engine failure.
What to Do If Your Engine Starts Making Noise
If you notice your engine making unusual or excessive sounds, here are a few things you can check:
- Look for oil leaks under the car—low oil levels can cause ticking or knocking.
- Inspect the belts for cracks or looseness if you hear squealing.
- Check for exhaust leaks by listening for deep rumbling sounds near the tailpipe.
- Monitor temperature and performance—overheating or sluggish acceleration may signal a bigger problem.
If the noise persists, it’s best to have a professional diagnose the issue before it leads to serious engine damage.
We Can Diagnose and Fix Engine Noise Issues
If your car’s engine is louder than usual or making strange sounds, don’t wait for it to get worse. At B & L Automotive in Newport News, VA, we can help you with engine diagnostics, exhaust system repairs, belt replacements, and maintenance to get your car running properly again. Whether it’s a minor fix or a serious repair, our team will find the problem and fix it before it leads to bigger damage.
A noisy engine could mean trouble—get it checked before it turns into a costly breakdown! B & L Automotive in Newport News, VA, offers expert diagnostics and repairs. Call today to schedule an appointment!