Sometimes the vehicle has no failure，It will not be able to start，For example, there are these reasons。

a、Forgot to close your own anti -theft dark switch，Broken oil or fire。

2、The key to your own has no chip (coil)，Anti -theft system plays a role。Some car owners do not know that there are anti -theft chips in the key handle，Lost a key，Just looking for a locksmith to give an ordinary key without chip，When you start the reading coil, you cannot get the correct key information，Think that it is illegal to start。

3、After startup，The smart key was taken away accidentally，Can'seabet appseabet iot start the flameout，Because the PESP system cannot detect the legal key，Press the boot switch operation invalid，The starter will not run。

4、One -click vehicles did not step on the brake pedal (or too lightly)，For safety，If the engine computer and PEPS system do not receive the brake switch signal，The system refuses to provide a startup signal for the starter。

5、Auto -gear vehicles are not in the air gear (N gear) or parking gear (P gear)，This is also a safe setting，If there is no sign of N or P or P,，No motivation to power supply to start，Prevent starting on other gears，Move the vehicle。

6、Manual gear vehicle is not in the air gear，Many hand -shielded vehicles are not in the air gear.，that is, the engine computer does not receive an empty transmission signal，Motivation will not reflect the motivation。

7、Manual gear vehicle did not step on the clutch，For safety，Also in order to start the motivation load when starting，Some vehicles do not step on the clutch pedal，The clutch switch is not closed，then the motivation will not run。

eight、Vehicles of diesel engine，The environmental temperature is too low，Diesel's liquidity becomes poor，Unable to supply fuel，Makes the engine from starting。

Nine、Added inferior fuel，When the cold car starts，Due to cylinder pressure、Speed、Factors of the temperature，Makes inferior fuel lit difficulty，Unable to start。

eleven、Small feedback of batteries，The starter speed is okay，But because the voltage is lower than the minimum voltage of the computer at the time of starting，Make the engine computer without working，Unable to start。

Of course, sometimes it is impossible to start, it is a real failure，For example, it is difficult to start motivation，Below is a detailed solution to the difficulty of startup。

Difficulty of engine startup refers to the motivation to drive the engine to rotate at normal speed，There are obvious signs of the car，But it is difficult to start; or it needs to be activated many times in a row，or a long time to start the motor to start the engine。

10. Poor fuel injector (leaky oil、Carbon、Globe blocking, etc.)。

11. Inaccurate time of fire (the timing of the time with wheel connection key)。

14. Instant pipe and advance、Excess carbon deposit carbon (the valve is closed strictly)。

15. ignition coil、Spark seabet ioseabet appplugs are poor or have damaged high -voltage lines, etc.。

For the failure of the difficulty，Should be distinguished when it appears during a cold car or appears during a hot car，or whether it is a cold car or a hot car all appears。Checking steps are as follows:

1. Failure self -diagnosis。If there is a fault code, look for the corresponding cause of the faulty code。The data flow at the startup at the startup，Analyze the cause of the fault based on data flow。

2. Check the authenticity of the air pipe during idle speed。If the vacuum is less than 66.7kpa，or when running at idle speed, there is a "hiss" leaky sound near the intake pipe，It means that the air intake system has air leaks，Each pipe joint of the air pipe should be checked、Cushion、Vacuum Software, etc.，and the exhaust gas recycling system、fuel evaporation recovery system。

3. Check the air filter。If the filter element is blocked, it should be cleaned or replaced。

4. If the throw is about 1/4, the engine can start normally，Difficulty starts when the throttle is closed at all levels，Then check whether the idling control valve and additional air valve work should be normal。In the cold car's idle operation，Draw down the idle control valve wire beam plug，Or when the cold car is idling, the additional air valve intake hose is clamped with pliers。If the engine speed does not decrease，It means that the work of idle control valves is abnormal，Check the idling control valve and control circuit。

6. Check the cooling temperature sensor and intake temperature sensor。If the resistance value does not meet the standard，Then replace it。Check its signal voltage online，See if it is the same as the standard，Otherwise, check the line。

7.。Use a multimeter or special instrument to detect the signal voltage of the air flow meter or the absolute pressure sensor of the intake manifold，If it does not meet the requirements，Then replace it。

8. If it is not easy to start during a cold car，and the hot car starts normal，Then check whether the work of the cold startup injector is normal。

9. If the cold car starts normal，hot car is not easy to start，Then check the ignition coil，ignition。If there is no abnormality，Then check fuel pressure。If Excessive fuel pressure，It means that the oil pressure regulator is blocked by the oil pressure regulator，The fuel in the oil pipe in the oil pipe after the hot vehicle is extinguished due to the high temperature.。When it is difficult to start the hot car,，It should also check the working situation of the activated carbon tank solenoid valve。If there is a stagnation phenomenon inside the solenoid valve，It will make the valve core not be able to return normally，Causes too much mixed gas。

10. Check the ignition when the idle operation。If it does not meet the standard value, it should be adjusted。

11.。If the computer cannot seabet loginseabet loginreceive the start -up signal of the start -up switch，Can't start the start and strengthen control，It will also lead to launch difficulties。This，The computer detector should be used to analyze the engine and computer，Or check the signal of the switch to the computer when checking the start -up switch when the computer wiring plug is started。If there is no signal，Then check the start and switch and line。

12.，Check whether the injector is blocked、Leakage and fuel injection atomization situation，After cleaning, it does not meet the requirements，Should be replaced。

13. Check the air pipe and advance、Venture of the Dividencaper。If the carbon accumulation is serious, it should be cleared。

14. Check the compression pressure of the cylinder。If the pressure of the cylinder is too low，The engine should be demolished。

(1) Analyze the control principle of intake and fuel injection when the electronic control fuel is started

Added air valve、The opening state of the idle valve is directly controlled by the cooling water temperature or the temperature of the cooling water、Starting signal is indirectly controlled by the engine and computer。Inlet air volume and fuel injection cannot be rationally matched，It may cause too strong mixed gas or too scarce may cause launch difficulties。For example:

(1) idle control valve accumulate carbon card death，The air channel is very small，At this time, the injector still sprays the same oil，It causes too much mixed gas to start difficulty。

(2) If an additional air intake is generated for some reason, it will also be mixed with sparse gas and starts difficulty。If the exhaust gas recycles card in the open position、Permanent pipe leak, etc.。

(3) Due to the low temperature when the engine is cold、low speed、The fuel sprayed in is not easy to gasification，It is easy to cause hybrid gas。So，When the engine starts, the computer can determine the start -up work condition based on the switch signal and the engine speed signal，Specific the following controls:

② Computer controlling injector directly obtains fuel injection increase。(Compute，Then correct the fuel injection pulse at the start of the initiative based on the temperature signal and battery voltage signal of the air intake)

 1. Check out fuel pressure，Including the establishment of fuel pressure fast、pressure value、Statue to keep pressure。   

 2. The strength of high -pressure sparks at the ignition system when starting also affects the start time。Do not forget to measure the battery voltage when starting、The ignition voltage of the computer and the igniter。

Cold car is difficult to start. Refers to a few times when the cold car starts several times before you can take the car，When the heat starts, start the car immediately。The reason for the difficulty of the cold start is that the mixed gas is too thin or too thick。Causes of the difficulty of starting the difficulty of the cold car are the cold startup injector without fuel injection、Cooling temperature sensor failure、Poor atomization、Poor atomization、Inlet pipe pipe accumulation of carbon、Insufficient ignition energy、Spark plug fault、Dis idle control valve failure, etc.。

It is difficult to start the hot start of the hot -booming to start normal，Difficulty in starting the heat，Even cannot start。The reasons for the difficulty of hot start is the cooling fluid temperature sensor failure，Inlet temperature sensor failure，Several fuel injectors leak oil or severe atomization，Cold start -injector failure idle speed valve，High -point ignition failure, etc. It is basically willing to be too strong。

The carbon accumulation formed by the rear carbon accumulation of the carbon in all parts of the engine is the most impact on the engine

1. The amount of air intake and instantaneous intake speed can cause acceleration and maximum speed decrease

2. Carbon accumulation is porous shape. When the engine is cold, the fuel is accumulated on the valve and the carbon absorption，As a result, the less fuel that actually enters the cylinder leads to low air -fuel ratio。

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Conclusion