What Causes Engine Abnormal Noise in Chery Tiggo 3x?
1 Answers
The causes of abnormal engine noise include premature fuel injection timing, diesel leakage from fuel injectors, piston impact on cylinder walls, excessive piston ring side clearance, collision between valve stem ends and rocker arms, and engine misfire. The specific cause needs to be determined based on different abnormal noise conditions, as detailed below: Abnormal noise caused by rough engine operation, commonly known as "knocking sound." The phenomenon is characterized by strong noise at low speeds, audible clearly from a distance of over ten meters, accompanied by difficult starting. After ignition, the engine runs unevenly with rapid coolant consumption. This noise is caused by premature fuel injection timing and requires readjustment of the fuel injection advance angle. Engine abnormal noise has a certain pattern, sometimes knocking, sometimes backfiring, accompanied by unstable engine speed and intermittent black smoke emissions. This uneven noise is caused by diesel leakage from fuel injectors. When this occurs, the fuel injectors should be serviced. The engine emits a "clunking" or "thudding" sound, particularly noticeable at low speeds or sudden speed changes, accompanied by oil burning. This noise is due to excessive clearance between pistons and cylinder walls, increasing piston impact on cylinder walls during operation. The solution is to replace the cylinder liners or pistons. A "clinking" sound resembling a small hammer lightly tapping an anvil can be heard along the entire length of the cylinder block, more pronounced during sudden speed changes. This is caused by excessive piston ring side clearance. Replace the piston rings, and if necessary, the pistons as well. A "clicking" or "tapping" sound around the cylinder head cover is quieter when the engine is warm and louder when cold, persisting even when fuel supply is stopped at low speeds. The main cause is excessive valve clearance, leading to collision between valve stem ends and rocker arms. Adjust the valve clearance. Exhaust gas flow shows obvious intermittency, with severe exhaust pipe vibration and clear engine abnormal noise. This is caused by engine misfire.
