【Fault description】
    Carburetor tempering, and car driving weak, fuel consumption surge phenomenon.
    【Inspection process】
    For the specific observation of the car, almost a step on the accelerator pedal there will be a tempering phenomenon, but the sound of the fire did not ignite the order of the wrong sound so violent, and the exhaust pipe is not shot, the initial diagnosis of the engine gas distribution mechanism has failed.
    And then off auscultation, 2-cylinder, 3-cylinder sound changes little, it is estimated here there are valves closed or ablated phenomenon.
    To further determine the cylinder pressure to measure the cylinder, 2 cylinder, 3 cylinder cylinder pressure was significantly lower than the standard value.
    Remove the cylinder head and found 2 cylinder, 3 cylinder into the exhaust valve are ablated. Replace the valve after the test, the phenomenon has been reduced, but also when the sound of tempering, it seems that the fault has not been completely ruled out.
    Once again to detect the cylinder pressure, 2 cylinder, 3 cylinder has not yet restored the specified value, and the test process, the valve there are irregular mess of the valve percussion. Santana sedan with hydraulic tappet device, the valve gap automatically adjust, supposedly should not have the valve clearance caused by the valve percussion sound, so the car is suspected to have a hydraulic tappet failure.
    【Fault Analysis】
    There are many reasons that may cause the carburetor to temper, so the specific signs of the carburetor tempering need to be specified to determine the scope of the failure.
    From the past experience, when the carburetor occurs when the phenomenon of tempering, usually caused by the following reasons:
    1, the engine ignition order chaos. The resulting carburetor tempering will be accompanied by difficulties in starting, exhaust pipe blasting, engine jitter and other symptoms;
    2, carburetor float chamber oil level is too low or lack of oil. The resulting carburetor tempering is often in the rapid acceleration or heavy load generated, but the temper is not serious, the sound is not, will obviously feel the lack of power;
    3, carburetor accelerator damage failure. In the normal operation of the engine, the carburetor will have fire mission, and accompanied by a sound like a blasting, the engine is difficult to accelerate, or even an acceleration on the flame;
    4, the ignition time too late. Which caused the carburetor tempering engine running occasional temper sound, and accompanied by boiled (coolant temperature is too high, the engine overheating), power down and acceleration and other phenomena;
    5, if the winter after the start soon or low speed rapid acceleration caused by the carburetor tempering, the driver is caused by misuse;
    6, if the gas distribution mechanism caused by the carburetor tempering, characterized by tempering rhythm, and in the engine under a variety of speed tempering.
    【Maintenance】
    Check the hydraulic tappet and found a 2-cylinder hydraulic tappet really damaged, indicating that the car carburetor tempering failure lies in the problem of hydraulic tappet, resulting in valve lax, power down, valve ablation, fuel consumption increased The Replace the already damaged hydraulic tappet, then try again, troubleshooting.