What are the reasons for a hot car not starting?
2 Answers
The reasons for a hot car not starting include: 1. Engine carbon deposits; 2. Weak spark plug ignition energy; 3. Insufficient fuel line low pressure; 4. Damaged carbon canister solenoid valve; 5. Ignition coil breakdown, poor thermal stability of internal electronic components in the ignition module; 6. Faulty intake air temperature sensor. When the weather is cold, the engine is in a cold state when starting the car, so it is necessary to let the car idle for a short while to allow the engine and its components to reach normal temperature, which is called warming up the car. The reason for warming up the car is that after the car has been parked for a long time, the engine oil flows back to the lower part of the engine oil pan. Therefore, after a long period of non-use (such as overnight), when starting the engine, the upper part of the engine is without oil and lacks lubrication. When warming up the car in place, avoid stepping hard on the accelerator. The correct way is to drive slowly at low RPM.
I've encountered the issue of a hot engine failing to start several times, mainly due to fuel system problems. When the engine is hot, the fuel pump may overheat and age, leading to insufficient fuel supply, or vapor lock may occur in the fuel lines, where heat expansion causes bubbles to block fuel flow. Fuel injectors are also prone to clogging; if low-quality gasoline is used or they haven't been cleaned for a long time, carbon deposits can block the injector nozzles. Once, after driving to shop and turning off the engine, it wouldn't restart, and I later found out the fuel filter was dirty and hadn't been replaced. It's advisable to regularly check the fuel pressure gauge readings, which should remain stable under normal conditions. Avoid letting the fuel tank run empty before refueling to reduce the intake of impurities. When startup fails, don't repeatedly attempt to start the engine, as poor heat dissipation in hot weather can worsen the damage. Regularly add fuel system cleaners and choose high-quality gas stations to avoid trouble. Developing these habits can reduce such unexpected incidents, ensuring safety and peace of mind.
