If your engine is running louder than usual, it may indicate an underlying issue with the exhaust, intake, or internal engine components. While some noises are harmless, sudden increases in engine volume can point to exhaust leaks, worn parts, or mechanical faults. An assessment is needed to identify the cause and prevent further damage.

What does it mean if the engine is louder than normal?

A louder-than-usual engine often means gases, vibrations, or moving parts are not being contained or dampened properly. This could be due to leaks in the exhaust, worn bearings, or components in the engine working harder than they should.

Common causes of a loud engine

• Exhaust leak (manifold, gasket, or muffler damage)
• Loose or damaged heat shield
• Worn timing chain or valve train components
• Low or dirty engine oil causing more friction
• Faulty catalytic converter or muffler
• Air intake leaks or damaged air filter housing
• Worn engine mounts increasing vibration noise

Why do you need to fix this problem quickly?

A louder engine may just be annoying, but it can also signal serious mechanical issues. Exhaust leaks can increase emissions, reduce performance, and allow harmful fumes into the cabin. Ignoring internal noises can lead to expensive repairs if components fail.

How do you know when to get it checked?

You should book an inspection if:

• The engine suddenly becomes louder
• You hear knocking, ticking, or hissing noises
• Acceleration is sluggish alongside the noise
• You notice strong exhaust fumes inside or outside the car
• The noise changes with RPM or load

What happens during an assessment?

A mechanic will:

1. Listen to the engine and identify the type and source of noise
2. Inspect the exhaust system for leaks or damage
3. Check engine oil level and condition
4. Inspect timing chain/belt, valve train, and other moving components
5. Check engine mounts and intake system for faults
6. Provide repair recommendations based on findings

How much does it cost to fix?

Minor repairs such as fixing a loose heat shield may cost $100–$200. Exhaust system repairs typically range from $300–$800, while internal engine component repairs can exceed $1,000–$3,000+ depending on severity.

Is it unsafe to drive with a loud engine?

Yes. While some noises are harmless, others may indicate serious issues that could lead to breakdowns or expensive damage. Exhaust leaks also pose health risks from fumes. It’s best to have the engine inspected promptly.