During the use and driving of the vehicle, many incorrect operations lead to vehicle problems, and the vehicle will also have many faults. It is believed that some owners encounter the problem of overheating and difficult starting of the vehicle. So, do you know the reason why hot cars don't start well?
The reason why the hot car doesn't start well
1. Leakage of fuel injector
The fuel injection of the fuel injector is normal, but the leakage belongs to additional fuel supply, so the more serious the leakage of the fuel injector, the thicker the mixture, resulting in poor starting of the hot car.
2. The carbon canister solenoid valve is damaged
The fuel atomization of the hot car itself is normal, and there is no need to replenish oil and gas. If the carbon canister is still Replenishing Oil and gas to the inlet, it will cause the mixture to be too rich, which will make it difficult to start.
3. Fuel quality
After the hot car is shut down for a period of time, the temperature in the engine compartment is still quite high. If the fuel itself is easy to volatilize, it is easy to form a high evaporation pressure in the fuel rail. When this pressure is greater than the pressure of the fuel supply system, it will form an air resistance, resulting in too thin oil vapor from the fuel injection nozzle, which makes it difficult to start.
4. Intake air temperature sensor
The intake air temperature sensor is similar to the water temperature sensor. Their function is to correct the fuel injection quantity, but the difference is that if the water temperature sensor fails, it will lead to difficulty in cold start; The failure of the intake air temperature sensor will make it difficult to start the hot car.
5. Engine carbon deposition
Engine carbon deposition has been a long-standing problem. Carbon deposition has a strong adsorption effect on gasoline. If there is more carbon deposition on inlet valve, throttle and piston, it is easy to adsorb some fuel, resulting in too thin mixture, which affects the start. This situation will also occur in cold start.
How long does it take to warm up the car
How long does it take to heat up a car? First of all, why does a car need a hot car? There are three main reasons:
First, start the engine after not using the car for a long time (such as overnight). At that time, the upper half of the engine is in the condition of no oil and lack of lubrication. It takes about 30 seconds after the engine is started to transport the oil to the piston, connecting rod, crankshaft and other parts of the engine that need lubrication most due to the operation of the oil pump.
Second, before the engine reaches the working temperature (about 90-110 degrees Celsius), its oil supply system cannot effectively gasify the gasoline because the temperature is still low (I believe everyone knows that the liquid gasifies when the temperature rises to the boiling point). It is not easy to burn and start the engine when the gasoline is in a "wet" liquid state before gasification. Otherwise, due to the high oil / gas mixture ratio, not only waste gasoline, insufficient horsepower, but also incomplete combustion of gasoline will emit black smoke.
Third, the lubrication of transmission gears is the least understood and most easily ignored by ordinary people. The same thing about gearbox gear oil and engine oil is that when the car is cold, the gear oil flows to the lower half of the gearbox. The solution is not to heat up the car in place. Because there is no gear oil pump in the gearbox, only the engine is moving and the rest is not moving. This situation can be improved only after driving slowly for a period of time after actually on the road.
So the right way to warm up: start 30 seconds to a minute after the road. However, at this time, do not drive at high speed, keep it at low speed, and the engine speed shall not exceed 3000 ~ 3500 rpm. Generally keep 2000 rpm.