What Is An Engine Misfire?
A misfire happens when one or more cylinders fail to burn fuel correctly. This can be caused by ignition faults, fuel delivery problems, air leaks, sensor faults or mechanical engine issues.
Common Causes Of Misfires
⚡ Ignition Coil Or Spark Plugs
Very common on petrol engines. Often causes shaking, rough idle and loss of power.
⛽ Injector Or Fuel Faults
Fuel injectors, low fuel pressure or delivery faults can all cause misfires.
💨 Air Or Vacuum Leaks
Split hoses or intake leaks can create lean running conditions and rough idle.
🧠 Sensor Faults
MAF, MAP, crank or camshaft sensor faults can affect engine timing and fuel delivery.
🌫 EGR Or DPF Problems
Diesel related faults can cause hesitation, rough running and power loss.
🔧 Mechanical Engine Faults
Compression issues and internal wear can cause persistent misfires.
Is It Safe To Drive?
- Flashing engine light: stop driving and seek assistance.
- Heavy shaking or power loss: avoid driving further if possible.
- Mild vibration: drive carefully and arrange diagnostics quickly.
How AutoAid Diagnoses Misfires
We use diagnostic scans, live data and targeted testing to identify the real cause of the misfire. We test before replacing parts, helping avoid unnecessary repairs and guesswork.
Want It Checked Today?
Send your registration number, postcode and details of when the shaking happens.