Engine Misfire

An engine misfire happens when one or more cylinders fail to burn the air-fuel mixture correctly. This can cause shaking, hesitation, poor fuel economy, and reduced power.

Common Causes

• Worn or fouled spark plugs
• Failing ignition coils
• Vacuum leaks
• Fuel injector problems
• Low engine compression
• Dirty or faulty mass airflow sensor

Related OBD Codes

• P0300 — Random/Multiple Cylinder Misfire Detected
• P0301 — Cylinder 1 Misfire Detected
• P0302 — Cylinder 2 Misfire Detected
• P0303 — Cylinder 3 Misfire Detected
• P0304 — Cylinder 4 Misfire Detected

Common Repairs

• Replace spark plugs
• Replace ignition coil
• Repair vacuum leak
• Clean or replace fuel injector
• Perform compression test and mechanical diagnosis

Related Repair Cost Guides

What Should You Do Next?

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