What Causes Engine Noise in Civic?

[VanZoe]

Here are the specific reasons for engine noise in Civic: 1. Engine Mount Deterioration: The abnormal noise caused by deteriorated engine mounts due to rough engine operation. This noise is caused by excessively early fuel injection timing and requires readjustment of the fuel injection advance angle. 2. Engine Misfire: The engine noise follows a certain pattern, accompanied by unstable engine speed and intermittent black smoke emissions. This uneven noise is caused by diesel leakage from the fuel injector. When this occurs, the fuel injector should be serviced. 3. Piston Slap: The exhaust pipe produces continuous backfire sounds during exhaust, along with black smoke emission and excessive exhaust pipe temperature. Starting becomes difficult, and the backfire sound reduces at low speeds. This abnormal noise is caused by excessively delayed fuel injection timing, and the exhaust pipe position should be adjusted promptly.