What Causes Abnormal Noise in Kia K3's Engine During Cold Start?
2 Answers
Kia K3's engine produces abnormal noise during cold start because the valves do not receive sufficient lubrication, causing the hydraulic lifters and mechanical rocker arms to malfunction. Below are relevant details: 1. Car Engine: The car engine is the device that provides power to the vehicle, acting as the heart of the car. It determines the vehicle's power, fuel efficiency, stability, and environmental performance. Some cases of abnormal noise during cold start are normal, but for safety reasons, it is recommended to get it inspected immediately. 2. Precautions: The vehicle should be driven at low speeds, with engine RPM not exceeding 3000-3500. Generally, it should be kept at around 2000 RPM; otherwise, the intense wear on the engine and transmission may become irreversible.
I've been driving my Kia K3 for over three years, and since last winter, there's been a metallic clicking sound from the engine compartment during cold starts. After inspection at the 4S店, it was found to be an issue with the timing chain. The mechanic explained that when the engine is cold, the oil hasn't fully lubricated the system yet, causing insufficient oil pressure in the chain tensioner, which leads to chain slack, especially noticeable in low temperatures. The problem was resolved after replacing the entire timing system. Actually, such abnormal noises are quite common. Besides the timing system, poor oil fluidity or mismatched viscosity can also cause insufficient lubrication during startup. I recommend using low-viscosity oil in winter, such as 0W-20, and turning on the ignition for a few seconds before starting to allow the oil pump to pre-lubricate—this trick can reduce 80% of abnormal noises. If the noise persists for more than two weeks, it's crucial to get it checked immediately, as a skipped timing chain can damage the engine, and repairs could cost several thousand dollars.
