The reason why Great Wall Fengjun 5-cool car wears out again and again: the most common cause is carbon deposits in the engine or spark plug failure .
When the vehicle engine has carbon deposits, it will not only cause the problem of reduced power and increased fuel consumption, but also make the vehicle idle unstable , causing start-up delays when the car is cold. Second, if the ignition efficiency of the spark plug decreases, the combustion conditions in each bar will be very different, causing engine vibration and some frustration.
This may also be due to the engine not being warmed up sufficiently. First of all, when the vehicle is cold, the fluidity of the engine oil is relatively poor. At this time, the engine piston cannot be lubricated effectively.t, and serious frustration will occur during operation. This phenomenon will disappear when the vehicle engine temperature increases. returns to normal.
Cause of carbon deposits
The power of The engine comes from When the engine piston moves down, the mixture of gasoline and air is drawn into the cylinder, then the piston moving upward compresses the oil and gas into a highly flammable gas. Finally, the spark plug ignites to make it explode and. the piston is pushed by this powerful explosive force. The engine thus produces power. The energy source, the mixture, must enter the combustion chamber through the intake valve.
A small amount of gasoline will adhere to the intake valve. When you will encounter the high engine temperature, hydrocarbons, paraffin and colloids contained in gasoline which cannot be completelynt burned will be burned into glue carbon. If the fuel injection nozzle is dirty, the sprayed gasoline is not well atomized and the gasoline and air are not mixed evenly, which will increase the amount of gasoline condensed on the intake valve .
There are several reasons: the main reason is that the phenomenon of the car not being able to start is not clearly described, is it a regular phenomenon or is it that it just won't start now.
1. Ask the user: the time the fault occurred, the phenomenon, the situation at that time, the cause of the fault and whether it has been repaired, dismantled, etc.
2. Determine the extent and location of the defect in advance.
3. Call the fault code and find out the contents of the fault.
4. Perform maintenance based on the fault range displayed by the error code, paying particular attention to whether the connectors are damaged.loose or falling and whether the wires are properly connected.
5. After the maintenance is completed, it should be checked whether the fault has been eliminated.
6. If the error code cannot be recovered or the error content cannot be found after recovery, approximately determine the extent of the error according to the phenomenon error and use the method of checking the working performance of the components one by one to eliminate it.
2. Diagnosis of common faults
1. The engine cannot start or is difficult to start
(1) The starter does not turn or turns slowly
a) Check the battery voltage.
b) Check whether the battery poles, wire connections, etc. are correctly connected. are loose.
c) Check the starting system, including the ignition switch, starter switch and air conditioner. Check the condition of the starter switch and starter, and ifthe connections of the various circuits are loose.
(2) The starter turns normally, but the engine cannot start
a) Call the error code.
b) Check the working condition of the fuel pump.
c) Check if the idle system is working properly (if the idle system is not working properly, the engine may start when the accelerator pedal is depressed).
d) Check the ignition system, including high voltage spark, ignition timing, spark plugs, etc.
e) Check if there is an air leak in the air intake system.
f) Check if the air flow meter or air pressure sensor is malfunctioning.
g) Check if the fuel injector and low temperature start injector are working properly. h) Check the EFI system circuit, including the relevant ECU connector terminals. i) Check if the mechanical part is defectivekiller.