What are the causes of abnormal noise in the Leiling Hybrid engine?
3 Answers
Leiling Hybrid engine abnormal noise causes: 1. Aging or loosening of engine mounts: Engine mounts are usually installed between the engine and the vehicle body, connecting the body and the engine, serving to secure the engine and provide cushioning and vibration damping. Once the mounts age or loosen, the engine's vibration increases, leading to abnormal noise; 2. Engine misfire: Engine misfire mainly refers to one or more cylinders not functioning properly; 3. The abnormal noise is likely caused by piston slap, generally due to poor lubrication conditions, excessive wear of the piston and cylinder walls, resulting in the piston skirt hitting the cylinder wall during engine operation. Engine abnormal noises can generally be divided into three types: abnormal noise during cold start, abnormal noise during rapid acceleration, and abnormal noise during idle state.
I've been driving this Levin Hybrid for over two years, and the most annoying thing is the sudden buzzing noise from the engine. Most of the time, it's due to a loose or aged belt—when the rubber hardens, it slips. Another issue is the aging rubber mounts; the repair shop mentioned that the frequent start-stop of the hybrid engine makes the mounts more prone to damage, causing vibrations to transfer into the cabin. The ignition system is also troublesome—when the spark plugs reach the end of their lifespan, they produce a ticking sound, and the hybrid engine's repeated starts place higher demands on ignition. Recently, in hot weather, I noticed the fan making noise, and the mechanic said it was due to dust buildup in the hybrid battery's cooling fan. Lastly, a reminder: it's best to keep the oil level at the midpoint—too little leads to poor lubrication, and too much increases resistance, both of which can easily cause noise.
Last week, I just helped my neighbor diagnose an abnormal noise in the Leiling Hybrid's engine. Start with the basics: open the engine compartment to locate the sound. If the noise is coming from the front, it might be due to wear in the tensioner pulley bearing. Metallic knocking sounds from the side could indicate a detonation issue. The hybrid system's frequent start-stop cycles make it more prone to carbon buildup, so using a fuel additive for cleaning is recommended. Also, pay attention to the belt condition—replace it if you see cracks. There's another hidden issue—generator failure. In the hybrid system, the generator also handles engine startup, and faulty windings can cause squeaking noises. Don't forget to check the coolant, as a failing water pump can also lead to abnormal engine noises.
