What are the main reasons for difficulty in starting a hot car engine?
2 Answers
The main reasons for difficulty in starting a hot car engine are: 1. The air-fuel mixture is too lean or too rich; 2. Fuel supply system or intake system malfunction; 3. Spark plug or ignition coil failure; 4. Severe carbon buildup in the engine; 5. Engine mount rubber aging or loosening; 6. Insufficient cylinder pressure. The solutions for difficulty in starting a hot car engine are: 1. Adjust the air-fuel mixture concentration; 2. Check the fuel supply system and intake system for faults; 3. Inspect whether the spark plugs or ignition coils are functioning properly and replace them if necessary; 4. Clean carbon deposits inside the engine; 5. Replace the engine mount rubber; 6. Use higher-quality fuel.
Having worked in the garage repairing cars for so many years, hot-start difficulty is a common issue. The main causes include fuel system problems, such as a failed fuel pressure regulator or clogged fuel injectors, where thermal expansion leads to unstable gasoline supply. Additionally, engine heat expansion can worsen carbon deposits, blocking the intake passages and affecting air-fuel mixture. Aging spark plugs are another factor, as higher temperatures weaken the spark, making ignition difficult. Sensor failures should not be overlooked either; for instance, a malfunctioning temperature sensor can send incorrect signals. I recommend regular checks of oil pressure and cleaning the throttle body to avoid breakdowns on the road. Using high-quality gasoline during routine maintenance reduces carbon buildup, and checking the engine temperature before driving in hot weather are all practical tips derived from experience.
