What Causes Abnormal Noise in the Starter?
2 Answers
Reasons for abnormal noise in the starter: 1. Aging or loosening of engine mounts: Engine mounts are designed to reduce vibrations and provide cushioning during engine operation, as well as to secure the engine. Once the mounts age or become loose, the engine may shake, resulting in abnormal noise. 2. Engine misfire noise: This mainly refers to one or more cylinders not functioning properly, causing noticeable shaking in the exhaust pipe and a distinct "popping" or "thumping" sound from the engine. 3. Piston slap noise: Due to poor lubrication conditions, excessive wear of the piston and cylinder wall can cause the clearance between them to exceed normal tolerances. During engine operation, the piston skirt impacts the cylinder wall, producing a clear "clanking" sound, which is more noticeable at idle or low speeds.
With decades of experience in car repair, I've encountered starter abnormal noises many times. The most common issue is gear meshing problems—sometimes insufficient lubrication or wear causes a rattling sound during startup. Additionally, bearing aging is another major headache; over time, they produce a humming noise when rotating, especially noticeable during cold starts in winter. The solenoid switch is also prone to failure—if you hear a clicking sound but the engine doesn't start, it's likely the culprit. Loose or corroded wiring can also cause abnormal noises, such as when connectors aren't securely plugged in. Low battery voltage makes the starter labor harder, amplifying the noise. That's why I always remind friends: abnormal noises aren't trivial—early inspection can save big money. Regular cleaning and lubrication significantly extend the starter system's lifespan—don't wait until it completely fails to act.
