What Causes Abnormal Noises After Starting the Car?
2 Answers
Abnormal noises after starting the car can be attributed to the following main reasons: 1. Aging or loosening of engine mounts: Engine mounts are rubber blocks placed between the engine and the car frame. Their purpose is to reduce vibrations and provide cushioning during engine operation, as well as to secure the engine in place. Once these mounts age or become loose, the engine may start to shake, resulting in abnormal noises. 2. Engine misfire noise: An engine misfire mainly refers to one or more cylinders not functioning properly. This is usually characterized by noticeable intermittent exhaust gas flow and severe shaking of the exhaust pipe, which is often related to faults in the ignition coil.
Unusual noises after starting the car should indeed be taken seriously. I've experienced this myself, and most of the time it's a squeaking sound from the belt, especially in cars that are five or six years old—aging belts tend to make such noises. It could also be a starter issue, producing a harsh metallic grinding sound. Another possibility is worn engine mount bushings, which can cause a clunking vibration noise during cold starts. If you've just had maintenance, check if the oil level is sufficient, as insufficient oil can cause the engine to grind and produce unusual noises. The most troublesome issue is internal engine problems, like faulty valve lifters or timing chain issues, where a ticking sound may vary with RPM. It's best not to delay—take it to a reliable repair shop to pinpoint the problem with a stethoscope. Minor issues, like replacing a belt, may cost just a few dozen dollars, while catching major problems early can save you thousands.
