Engine
What Causes Engine Knocking Noises in Cars and Vans?
Engine knocking sounds can indicate anything from low-quality fuel to worn bearings or timing chain issues that require immediate mechanical attention.
Knocking or tapping noises from the engine bay are a sign that something inside the engine is not moving as it should. In diesel engines, injector knock can be caused by poor fuel quality or failing injectors. Bottom-end knocking often points to worn main bearings or big-end bearings, while top-end tapping may indicate valve clearance issues or a stretched timing chain. Ignoring these noises can lead to catastrophic engine failure. A mechanic will perform a compression test, inspect oil pressure, and listen with a stethoscope to locate the source.
Key takeaways
- Fuel quality and injectors can cause diesel knock
- Worn bearings produce a deep rhythmic knock
- Timing chain issues cause rattling from the front of the engine
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