What causes the rattling noise when accelerating by pressing the accelerator?

[LaKylie]

Accelerating by pressing the accelerator and hearing a rattling noise is most likely caused by engine knocking. Here are the related reasons that can lead to engine knocking: 1. Excessive carbon deposits in the engine combustion chamber: This can increase the compression ratio (generating high pressure) and also create hot spots or sparks on the carbon deposit surface, leading to engine knocking. 2. Overheating of the engine: If the engine operates in a too hot environment, causing high intake air temperature, or if the engine coolant circulation is poor, it can result in engine overheating and knocking. 3. Low octane rating of the fuel: The higher the fuel grade, the stronger its anti-knock properties. Engines with high compression ratios have higher combustion chamber pressures. If fuel with low anti-knock properties is used, knocking is more likely to occur.