What Causes Difficulty in Starting a Cold Engine?

[Aurora]

Reasons for difficulty in starting a cold engine: 1. Low engine temperature; 2. Excessive carbon buildup in the throttle and idle valve: Too much carbon deposit can easily clog the idle air passage, leading to poor air intake. Carbon deposits primarily form due to incomplete combustion during engine operation, combined with gummy substances produced when impurities in fuel and engine oil burn, resulting in carbon buildup. Carbon deposits can cause various issues such as engine shaking when cold, idle engine vibration, reduced power, increased fuel consumption, difficulty in starting, unstable idle, poor acceleration, excessive exhaust emissions, and higher fuel consumption. The solution can be alleviated by cleaning the carbon deposits.