What Causes the Extremely Loud Noise When Starting a Lingdu Cold Engine?
2 Answers
Lingdu cold engine starting with extremely loud noise may be caused by intake noise generated by the engine's intake system or abnormal wear of the engine's external belt or pulley. Here is a detailed introduction to the reasons for loud starting noise: Winter Reasons: In winter, the atomization conditions of gasoline are poor, especially for vehicles with carburetors, which are generally difficult to start, and even after starting, they cannot immediately transition to normal working conditions. Therefore, during winter maintenance, it is necessary to clean and unclog all oil and air passages, check the working conditions of the throttle valve, choke valve, accelerator pump, and vacuum pump, and adjust them to the optimal state. At the same time, the idle fuel supply concentration should be appropriately adjusted to ensure normal idle operation in severe cold. Spark Plug Reasons: For the electrical system, mainly check the distributor's platinum gap and the spark plug's electrode gap. The distributor's platinum contacts should be clean without erosion, with a contact surface of more than 70%, and the gap should be between 0.3 to 0.45 millimeters. For models with electronic ignition, the spark plug gap is generally between 0.6 to 0.7 millimeters. If the spark plug gap is too large, the engine is difficult to start when cold. If the gap is too small, the engine's output power decreases, fuel consumption increases, and exhaust emissions exceed standards.
The LAMANDO makes an extremely loud noise during cold starts, a situation I often hear friends complain about, and my own car has had similar experiences. Simply put, during cold starts, the lubricating oil is at a low temperature and has high viscosity, increasing friction between engine components like pistons and crankshafts, which can easily produce loud noises. Additionally, if the timing chain is aged or loose, its stretching or collision sounds can become particularly noticeable in low temperatures. Moreover, if the exhaust system is loose or there’s a leak in the piping, abnormal airflow during cold starts can also cause significant noise. If the engine oil hasn’t been changed for too long or low-quality oil is used, poor fluidity can lead to rough engine operation. Don’t underestimate this issue—frequent driving under such conditions can cause considerable engine wear. It’s advisable to first check the oil condition and timing chain, and if necessary, change the oil or consult a professional mechanic. Otherwise, long-term neglect could result in high repair costs. Anyway, after dealing with it a few times, the noise reduced significantly. Also, warming up the engine for a minute before driving in winter helps.
