[汽车修理知识]How to judge the simple fault of the car

There is a saying called "Interlacing is like separating mountains", no need to explain, everyone understands the meaning.In real life, you know how to drivecarThere are very few car owners who can make simple judgments on the working principle; for some difficult problems, if the driver can provide more professional data, it is essential to solve this problem; for example: "The engine cannot start normally Take this typical failure as an example, because the failure phenomenon always exists before the failure point is resolved. This gives the maintenance personnel a great opportunity. What opportunity? Check step by step according to the theory, eliminate suspicious points, and determine the point of failure. For "no car", it is nothing more than the three main factors of fuel supply, ignition, and cylinder pressure.
The reason can be found; however, if the word "sometimes" is added in front of "not in the car", the fault will become a difficult problem at this time; because the fault phenomenon does not appear after the car is driven to the repair shop, the maintenance personnel It is impossible to determine which of the problems occurred at the time of the failure, and the problem cannot be solved accurately.But if the driver can make some simple basic judgments, for example, when a failure occurs, each cylinderHigh-voltage lineWhere there is no high-voltage spark, the maintenance personnel will follow the clues described by the driver to narrow the scope of the fault so that the fault can be found as quickly as possible. Below we introduce some simple accident judgment methods to drivers:
1. How to test the engineIgnition system: Prepare an oldSpark plug, Remove any high-voltage line from the spark plug, install the spare spark plug on the high-voltage line,motor, Observe whether the spark plug has high-voltage sparks;
2. How to test whether the engine cannot be started due to "no oil" (a bottle ofCarburetordetergent).willValveRemove the air intake hose connected to the body and open itThrottle, Spray the chemical cleaning agent into the intake branch pipe for 3 seconds. Then close the valve and start the motor, and observe whether the engine shows signs of "carriage";
3. How to test the cylinder pressure: firstIgnition coils, OrIgnition moduleUnplug the power cord to prevent the high-voltage fire system from causing a fire when the engine is started. Remove the spark plug and put a clean towel on the spark plug hole. Start the engine and observe whether the towel can be sprayed out.
If the drivers can master the above 3 simple methods, and tell the maintenance personnel of the results, they will provide powerful help to solve the intermittent non-car problem.

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