What Causes Difficulty in Cold Start but Normal Operation When Warm?

[LeEmery]

The reasons for difficulty in cold start but normal operation when warm are: 1. The cold start fuel injector is not spraying fuel; 2. Faulty coolant temperature sensor; 3. Faulty intake sensor; 4. Poor fuel injector atomization; 5. Carbon buildup in the intake manifold; 6. Insufficient ignition energy; 7. Faulty spark plugs; 8. Faulty idle control valve. The solutions for difficulty in cold start but normal operation when warm are: 1. Check the battery status or perform charging and testing; 2. Inspect cylinder pressure and clean or repair valves or cylinders with carbon buildup or wear; 3. Choose a reputable gas station for refueling; 4. Check or replace spark plugs.