Why is it that the car is good when the car is cold, but it is not good to fire when the car is hot?

The preliminary judgment is that the valve is not ground well and needs to be re-ground, you can ask them to measure the cylinder pressure to know.

Hello, it is estimated that there is a problem with the ignition coil, which is generally put on for a period of time, and the hot car is turned off.

After a short period of fire, it is not easy to answer, only the starter turns, and it does not catch fire. Because you only said the general situation, you can go to the repair shop to check the specifics, it is recommended to use the computer to check the fault, it should be the problem of the water temperature sensor.

If there is too much carbon accumulation or the exhaust gas backflow after the ignition is turned off, the mixture is too thick and difficult to start, so it is good to wait for a few minutes.

Hello this rider: Check the gasoline pump and water temperature sensor. Thank you.

The ignition of the cool car is normal, and it is not good to ignite when the car is hot.

You can check whether the fuel injector is relieved, and the fuel injection nozzle can not store the pressure after the vehicle is extinguished when the vehicle is hot, and the gasoline will flow to the combustion chamber, which will produce a mixture of gas thickness, resulting in symptoms such as poor start when the car is hot.

Do not replace it directly, you can remove the fuel injector, keep opening the oil pipe, and observe whether the fuel injector has oil leakage under the condition of ensuring that the gasoline pipe is under pressure.

If the throttle is dirty, it may cause the vehicle to turn off the throttle when it is driving normally, and you can remove the intake hose yourself to see if the throttle is dirty, and you can also go to the repair shop to check the opening of the throttle with a computer, and the general opening between 0-5 should be fine, once it is exceeded, it can be cleaned.

Go check if the spark plug is going to be replaced.

Causes: Engine carbon deposits, intake temperature sensors, fuel quality, damaged solenoid valves of carbon canisters, injector dripping, etc.

1. Injector dripping, injector fuel injection work is normal, but dripping leakage belongs to additional fuel supply, so the more serious the injector drip, the thicker the mixture, which leads to the hot car is not easy to start.

2. The solenoid valve of the carbon tank is damaged, and the fuel atomization of the hot car itself is normal, and there is no need to replenish oil and gas.

3. Fuel quality, after the hot car is turned off for a period of time, the temperature of the engine compartment is still quite high, if the fuel itself is easy to volatilize, it is easy to form a higher evaporation pressure in the fuel rail, and when the pressure is greater than the pressure of the fuel supply system, it will form gas resistance, resulting in too thin oil vapor from the fuel injector, which will lead to difficulty in starting.

4. Inlet air temperature sensor, inlet air temperature sensor is similar to water temperature sensor, their role is to correct the amount of fuel injection, but the difference is that if the water temperature sensor fails, it will lead to cold start difficulties; A faulty intake air temperature sensor can make it difficult to start a hot car.

5. Engine carbon deposit, engine carbon deposit is already a big problem, carbon deposit has a strong adsorption effect on gasoline, if the intake valve, throttle, piston and other carbon deposits, it is easy to adsorb some fuel, resulting in the mixture is too thin, which affects the start, this situation will also appear in the cold car start.

Of course, in addition to these common factors, there are many reasons why the hot car is not good to start, if the hot car is not good to start, it is recommended that the owner go to a professional repair shop or 4S shop for maintenance.

If there is a lot of carbon deposition in the car engine, there will be the following conditions:

1. It is not easy to start when the cold car is ignited many times, and it is normal when the car is hot;

2. The engine idle speed is unstable, and the speed is high and low;

3. The driving feeling is weak and stuffy, especially when overtaking, and the speed response is slow, which is very different from the new car;

4. The exhaust of the car is pungent and the emission exceeds the standard;

5. The fuel consumption of the car has increased a lot compared with before.

Hello! The hot car ignition did not reflect, and the cold car hit the dozen. The fault is poor start of the hot car.

Please check: 1. Oil circuit failure. Focus on checking whether the fuel injector, gasoline filter element, and gasoline pump suction filter are dirty and blocked.

Second, circuit failure. Please check whether the spark plugs, cylinder wires, and ignition coils are burned, leakage, and whether the ignition coil cylinder wire jacks are oxidized and corroded resulting in weak high-voltage ignition. Third, the cylinder pressure is insufficient.

Measure whether the engine cylinder pressure is too low, and check whether the valve clearance is too small, resulting in insufficient cylinder pressure in the hot car, which is not good for driving. Fourth, line failure. Check whether the inlet pressure sensor and coolant temperature sensor are distorted or damaged.

As well as whether the ignition coil and crankshaft position sensor are unstable in heating performance, resulting in weak ignition ability of hot cars and poor driving. Hope it helps. [Car questions, ask the car master.]

4S shop professional technician, 10 minutes to solve. 】

When the gasoline pump is working, in order to replenish the space of the fuel tank to consume the part of the oil that enters, there is a vacuum pump connected to the fuel tank, and if this thing is broken, it will cause the hot car to be not good for ignition, because after the hot car is turned off, the broken vacuum pump will not be able to consume the air demand of the fuel tank space, so the gasoline to the valve body and the machine will be pumped back to the fuel tank, and the air in the fuel tank has not been replenished when the hot car is ignited, in fact, this has nothing to do with the hot car and the cool car, it is just a matter of time, and the fuel tank air is full after it will naturally start. So why is the cool car so good? That's because the gasoline pump pumps gasoline from the tank when it works, and the mailbox doesn't fight with it.

This is because of poor start of the hot car.

There are many reasons why the hot car does not start well, and the following items can be specifically checked:

1. The speed of the starter is too low or the starter is slipping;

2. Failure of coolant temperature sensor;

3. Insufficient fuel pressure;

4. Injector failure;

5. The air filter is blocked;

6. Whether the spark plug electrode gap is normal and whether there is carbon deposition.

What parts did you replace or repair? I have the same problem with my car, and I am anxious to give advice.