If your engine is sputtering, it means combustion is not happening smoothly in one or more cylinders. This often feels like the engine is struggling, losing power, or making popping noises. Sputtering usually points to issues with fuel delivery, ignition, or air intake, and should be diagnosed quickly before it causes further damage.

What does it mean if the engine is sputtering?

Sputtering occurs when the air-fuel mixture is not burning properly inside the engine. This can be caused by too much or too little fuel, weak spark, or restricted airflow, resulting in poor performance and rough running.

Common causes of engine sputtering

• Dirty or failing spark plugs
• Faulty ignition coils or distributor components
• Clogged fuel injectors or fuel filter
• Failing fuel pump
• Vacuum leaks in the intake system
• Dirty or failing mass airflow (MAF) sensor
• Low fuel pressure or contaminated fuel

Why do you need to fix this problem quickly?

Sputtering reduces engine efficiency, increases fuel consumption, and can cause stalling. Long-term driving with this issue may damage the catalytic converter or lead to more expensive engine repairs.

How do you know when to get it checked?

You should book an inspection if:

• The engine sputters when idling or accelerating
• You feel a loss of power or hesitation
• The Check Engine Light is on
• You hear popping or backfiring noises
• Fuel consumption has noticeably worsened

What happens during an assessment?

A mechanic will:

1. Scan the ECU for fault or misfire codes
2. Inspect spark plugs, coils, and ignition system
3. Check fuel pressure, fuel pump, and injectors
4. Inspect the fuel filter and replace if clogged
5. Test airflow sensors and look for vacuum leaks
6. Road test to replicate the sputtering under load

How much does it cost to fix?

Replacing spark plugs or filters typically costs $150–$300. Injector cleaning or ignition coil replacement can range from $300–$700. More complex fuel system or sensor repairs may cost $800–$1,500+.

Is it unsafe to drive with a sputtering engine?

Yes. Sputtering can lead to stalling or loss of power, especially during acceleration, making driving unsafe. It also risks damage to the catalytic converter and engine if ignored. The issue should be inspected and repaired promptly.