If you hear a sputtering noise from your engine or exhaust, it usually means fuel, air, or exhaust gases are not flowing properly. This can affect performance, fuel economy, and emissions. While sometimes it’s a minor issue, sputtering can also point to more serious engine or exhaust system problems that require immediate attention.

What does it mean if your engine or exhaust is sputtering?

Sputtering happens when combustion is uneven or incomplete. This may come from an ignition issue, a fuel delivery problem, or an exhaust leak. The result is a rough, inconsistent engine sound and possible performance loss.

Common causes of sputtering noise

• Faulty or worn spark plugs
• Bad ignition coils or spark plug wires
• Fuel injector problems (clogged or leaking)
• Dirty or failing mass airflow sensor (MAF)
• Vacuum leaks in the intake system
• Blocked fuel filter or weak fuel pump
• Exhaust leaks near the manifold or muffler

Why do you need to fix this problem quickly?

Ignoring sputtering can lead to misfires, reduced performance, poor fuel economy, and increased emissions. Long-term driving with misfires can damage the catalytic converter, which is a costly repair.

How do you know when to get it checked?

You should book an inspection if:

• You hear consistent sputtering from the engine or exhaust
• The car shakes or runs roughly when idling
• You notice reduced acceleration or power
• The Check Engine Light is illuminated
• Fuel economy drops noticeably

What happens during an assessment?

A mechanic will:

1. Listen for the sputtering and identify if it’s from the engine or exhaust
2. Check ignition components (spark plugs, coils, leads)
3. Inspect the fuel system for clogs or leaks
4. Scan the ECU for error codes
5. Inspect intake hoses and vacuum lines
6. Check the exhaust system for leaks
7. Recommend necessary repairs

How much does it cost to fix?

Costs vary depending on the cause. Spark plug replacement may cost $120–$300. Fuel injector servicing typically costs $250–$500. Exhaust leak repairs can range from $200–$800+.

Is it unsafe to drive with a sputtering engine or exhaust?

Yes. Sputtering can lead to loss of power, increased emissions, and potential damage to the catalytic converter or engine. The issue should be checked and repaired as soon as possible.