What is the reason for the sudden power failure of the car?

There are many reasons for the lack of engine power, such as air filter clogging, piston ring broken or stuck, poor valve seal, too late ignition time, mechanical failure of carburetor, air leakage in intake pipe, bad or non-working individual cylinders and so on. However, some faults with insufficient engine power can be solved with ambiguity.

Such as the general wear of cylinders, poor circulation of carburetor oil circuit, etc. When the engine power is insufficient and the engine oil is burned, the reason of the power shortage should be judged first. After eliminating the reasons such as air filter blockage, carburetor throttle not fully opened, poor ignition timing, damaged intake pipe gasket, and individual cylinders not working or not working well, the working condition of carburetor is judged according to whether the engine oil consumption is too high. If the fuel consumption is too high and the exhaust gas is thick, it is likely that mechanical faults such as metering hole falling off will occur, which must be repaired. Finally, let's judge the wear of the engine cylinder. Engine wear directly affects the tightness of the cylinder; Therefore, checking the tightness of the cylinder can reflect the wear degree of the cylinder to a great extent, and the most convenient way to check the tightness of the cylinder is to check the compression pressure of the cylinder with a cylinder pressure gauge.

(a), cylinder compression pressure inspection and judgment method:

1. Run the engine to normal water temperature (80-90C) and shut down the engine.

2. Remove all spark plugs so that the choke valve and throttle valve are fully opened (the accelerator pedal is fully depressed).

3. Hold the cylinder pressure gauge, press its conical rubber head tightly on the spark plug hole and measure the cylinder compression pressure one by one; When measuring, use the starting motor to drive the engine (the speed should not be lower than 150 rpm).

4, in order to measure more accurately, generally every cylinder to measure 2-3 times, each time to turn the crankshaft 4-6 revolutions.

5. Judging whether the cylinder pressure is normal depends on the specific model, but in some cases it can also be estimated according to the compression ratio of the engine (what is the compression ratio and cylinder compression pressure of the specific automobile engine?