What are the reasons for difficulty in starting the engine after hot shutdown?
1 Answers
The reasons for difficulty in starting the engine after hot shutdown are as follows: 1. Fuel injector leakage: Normally, the fuel injector sprays fuel, but leakage constitutes additional fuel supply. The more severe the leakage, the richer the air-fuel mixture becomes, leading to difficulty in starting when the engine is hot. 2. Damaged carbon canister solenoid valve: During hot starts, fuel atomization is already normal, and additional fuel vapor is unnecessary. If the carbon canister continues to supply fuel vapor to the intake tract, it will cause an overly rich mixture, making it difficult to start. 3. Fuel quality: After the engine is shut down when hot, the engine compartment remains at a high temperature. If the fuel is highly volatile, it can form high vapor pressure in the fuel rail. When this pressure exceeds the fuel system's supply pressure, vapor lock occurs, causing the fuel injector to spray overly lean fuel vapor, leading to starting difficulties. 4. Damaged intake air temperature sensor: The intake air temperature sensor functions similarly to the coolant temperature sensor, both adjusting fuel injection. However, if the coolant temperature sensor fails, it causes cold start difficulties, whereas a faulty intake air temperature sensor results in hot start problems. 5. Engine carbon deposits: Carbon deposits strongly adsorb gasoline. If there are significant carbon deposits on the intake valves, throttle body, or pistons, they can adsorb some fuel, leading to an overly lean mixture and affecting starting. This issue can also occur during cold starts.
