What Causes a Car to Start Easily When Cold but Not When Hot?

1 Answers
DawsonAnn
07/29/25 9:03am
There are several possible reasons why a car starts easily when cold but fails to start when hot: 1. Carbon Deposits: At high temperatures, carbon deposits have a strong adsorption effect on fuel. Excessive carbon buildup on pistons, throttle valves, and intake pipes can absorb a portion of the fuel, resulting in a lean air-fuel mixture (too much air, too little fuel), which affects engine starting. 2. Fuel System Malfunction: When the car is hot, temperatures are high. If the owner uses low-quality gasoline from small gas stations to save money, poor fuel quality can cause gasoline to evaporate, leading to an overly lean mixture. Additionally, issues like a malfunctioning fuel pump or leaking fuel injectors can also make starting difficult.
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