What Causes Difficulty in Cold Engine Starting?
1 Answers
Two main reasons: First, the low temperature of diesel fuel and combustion chamber increases combustion difficulty. Second, lower temperatures cause higher viscosity of lubricating oil, requiring the engine to overcome greater lubrication resistance during startup. Below are extended explanations: 1. Fault causes: Primary reasons for cold start difficulties include malfunctioning cold start injectors, faulty coolant temperature sensors, defective intake sensors, poor fuel injector atomization, carbon buildup in intake pipes, insufficient ignition energy, spark plug failures, and idle control valve issues. Poor fuel quality often results in low volatility, especially during winter when lower temperatures make fuel atomization difficult in cold engines, preventing proper air-fuel mixture in cylinders and causing startup difficulties or failures. 2. Excessive carbon deposits: Lower temperatures require more fuel for cold starts, making carbon deposits more likely to interfere with successful startups. Carbon buildup adversely affects engine performance throughout the engine. Excessive combustion chamber carbon deposits increase compression ratio, creating hot spots that cause pre-ignition and knocking, reducing engine lifespan. Carbon on valves and seats prevents proper sealing, leading to difficult startups, power loss, and accelerated valve erosion.
