What are the causes of difficult cold start?
2 Answers
Causes of difficult cold start: 1. The temperature of coolant in the cooling system and lubricant in the lubrication system is relatively low; 2. Spark plugs are not replaced in time; 3. Ignition coil failure; 4. Excessive carbon deposits in the throttle and idle valve; 5. Whether the water temperature sensor of the engine control system is working properly; 6. The nozzle is not tightly closed or blocked due to excessive carbon deposits inside. The method for cold engine start is: When the first start fails, wait for 20 seconds before the second start. After starting, do not rush to drive and allow some preheating time. Generally, it is more fuel-efficient to start when the vehicle's water temperature reaches 40 degrees.
My car sometimes has a particularly hard time starting in cold weather. I think it's due to insufficient battery power, making it harder to start in low temperatures, especially when the battery in an older car is weak. Carbon buildup on the spark plugs can also cause ignition issues, requiring inspection or replacement. If the fuel pump is aging, delayed fuel supply when the engine is cold can prevent starting. A clogged air filter affects air intake, and the already thin air in cold temperatures makes it worse. Engine oil becomes thicker when cold, increasing the engine's burden, so it's important to ensure the oil level is appropriate. A lack of antifreeze can cause issues with the cooling system. Faulty ECU sensors sometimes misjudge the temperature, making starting difficult. I recommend a comprehensive maintenance check before the cold weather sets in, replacing the battery and spark plugs, which can significantly reduce such problems. Checking the fuel pump and air filter is also crucial—don't wait until you're stranded to regret it.
