Is it normal for the VV7 engine to make abnormal noises?
2 Answers
It is normal for the VV7 engine to make abnormal noises. Since the engine is a direct injection engine, the fuel is injected directly into the cylinder during operation. Additionally, the direct injection engine is equipped with a high-pressure pump, which can produce abnormal noises during operation. This is considered a normal phenomenon. Causes of abnormal engine noises in cars: 1. Aging engine mounts: Engine mounts are rubber blocks placed between the engine and the frame. Their purpose is to reduce vibrations and provide cushioning during engine operation while securing the engine in place. Once these mounts age or become loose, the engine may shake, leading to abnormal noises. 2. Engine misfire: This mainly refers to one or more cylinders not functioning properly. The exhaust gas flow will show noticeable interruptions, and the exhaust pipe may shake significantly. This phenomenon is often related to issues with the ignition coil. 3. Poor lubrication: Due to insufficient lubrication, excessive wear may occur between the piston and cylinder wall, causing the clearance between them to exceed normal tolerances. This results in noticeable knocking sounds during idle or low-speed operation. 4. Overly rich fuel mixture: When the engine's air-fuel mixture is too rich, it may be difficult to start. After starting, acceleration may be sluggish, and the engine may run unevenly. The exhaust pipe may emit black smoke, accompanied by popping or knocking noises. Methods for diagnosing abnormal engine noises: 1. Manual inspection: This mainly involves using a stethoscope, performing a cylinder cut-off test, and adjusting the throttle opening to listen and observe changes in abnormal noises. During the inspection, it is also important to monitor the color and volume of exhaust smoke and the readings of various gauges. 2. Instrument diagnosis: Since different types of engine noises and vibrations have distinct sound levels, pressures, and amplitudes, any wear in engine friction pairs, increased clearance, or loosening of components can produce abnormal noises and vibrations. These can be reflected through specialized diagnostic instruments.
I've been driving the VV7 for several years, and encountering abnormal engine noises is no small matter. A normal engine should run with a steady hum. If you hear clicking or squeaking sounds, it's likely there's a problem. It could be a loose timing chain, worn bearings, or sometimes an aging belt. I once experienced a similar situation where the noise kept getting louder. When I took it to the dealership for inspection, they found that the piston rings were worn and needed replacement. I suggest you don't take it lightly and go to a professional repair shop for diagnosis immediately. Otherwise, it could lead to more severe damage or even safety hazards. During regular maintenance, check engine components more often and change the oil periodically to effectively prevent such issues. Safe driving is the top priority.
