Knocking or Pinging Under Acceleration
Schedule a Visit — Urgency 3/5You can drive with this noise, but go easy on the accelerator. Avoid heavy loads and hard acceleration. Get it checked within a couple of weeks. If the knocking becomes very loud or constant, stop driving and get a tow. This is general guidance — always consult a mechanic for your specific situation.
This is general guidance. Your situation may differ — when in doubt, don’t drive.
What does it sound like?
A metallic knocking or pinging sound that gets louder when you accelerate or drive uphill. It sounds a bit like someone tapping on a metal pipe from inside the engine. You might notice it most when the engine is under load — pulling away from lights, going uphill, or overtaking.
What could be causing it?
If the knocking started after filling up with fuel, try using a higher-octane petrol next time. If it has been happening for a while, carbon buildup or a sensor fault is more likely.
What should I do right now?
Try filling up with premium (higher-octane) fuel next time and see if the noise goes away. If it does, your engine prefers the better fuel. If it does not improve, book an appointment with your mechanic within the next week or two. Do not ignore persistent knocking — it can lead to engine damage over time.