Why Won't the Car Start When Cold?

[RichardRose]

Difficulty starting a cold engine may be caused by issues in the intake system or fuel delivery system. Below are detailed explanations of potential causes and corresponding solutions: Intake System Issues: As temperatures drop, fuel injected into the intake manifold may not atomize properly. If carbon deposits exist in the engine's intake system, they can absorb portions of the fuel-air mixture, making it harder to ignite in the combustion chambers. Solution: Consider cleaning the engine's intake passages and throttle body. Fuel Delivery System Issues: Difficulty building fuel pressure in the supply lines often occurs during extremely cold mornings. This is typically caused by contamination in fuel lines or injectors, where low temperatures allow water and fuel contaminants to mix, obstructing fuel flow and resulting in hard starting or failure to start. Solution: Perform a complete fuel system cleaning to thoroughly resolve ignition problems.