What Causes Difficulty in Cold Engine Start?

[SanOscar]

Difficulty in cold engine start is caused by: 1. Malfunctioning cold start injector; 2. Fuel injector leakage; 3. Incorrect ignition timing; 4. Open circuit in wiring from start switch to ECU; 5. Too low cylinder compression pressure; 6. Air leakage in intake system; 7. Too low fuel pressure; 8. Clogged air filter; 9. Faulty coolant temperature sensor; 10. Malfunctioning mass air flow sensor; 11. Faulty idle control valve or auxiliary air valve. Solutions for cold start difficulty include: 1. Check battery condition; 2. Replace with appropriate engine oil; 3. Replace spark plugs promptly. Methods for warming up the engine: 1. Drive after 30 seconds to 1 minute of idling; 2. Maintain low-speed driving; 3. Normal driving can commence after engine temperature reaches optimal operating range.