Diagnostics

Car Misfiring Or Shaking Under Load

For rough running, shaking, flashing engine lights and P0300-style fault codes.

Cowbridge, Llantwit Major, Barry and Bridgend

Misfires need proof before parts

A misfire can be caused by plugs, coils, injectors, compression, fuel delivery, air leaks, wiring or ECU control. Replacing the most common part is not the same as proving the fault.

We use the symptom, scan data, cylinder information, live values and workshop checks such as smoke or pressure testing where appropriate before recommending the repair route.

Diagnostics

What happens next

You do not need to know the workshop term. Tell us the symptoms and we will explain whether the car needs servicing, fault-finding or repair work.

What we look at

P0300 and cylinder-specific misfire fault codes.
Rough idle, shaking, flashing engine light or poor acceleration.
Coils, plugs, injectors, compression, fuelling, wiring and air leak checks.
Misfires under load, at idle, cold, hot, in damp weather or intermittently.

Plan your visit

Related services and bookings

Engine light or poor running

Injectors

Electrical fault or warning lights

Tell us the symptoms and we will explain the next step.

Include warning messages and previous work so we can discuss the right assessment or repair.

Contact Llandow Servicing

Visit our Llandow workshop for prestige car servicing across the Vale of Glamorgan and Bridgend.