How is the engine cylinder missing caused?

Engine cylinder failure: Engine cylinder failure means that engine failure leads to insufficient power, that is, there will be no power. As far as the total number of engine cylinders is concerned, several cylinder blocks are not working. Lack of engine cylinder will shorten the service life of lubricating oil, which is prone to instant fire, high fuel consumption, black smoke and weakness. The horsepower drops, the vehicle can't speed up, the engine shakes badly and the driving noise increases. A 2007 sagitar with a manual transmission of 1.6L has a cruising range of about 15000 km. The engine is unstable at idle speed, and the cylinder is missing when accelerating, and the ES P warning light on the instrument panel is always on.

Causes of engine cylinder missing: the engine cylinder liner piston ring has a large wear gap, the intake and exhaust valves are not tightly closed, and the valve oil seal leaks oil, resulting in insufficient cylinder pressure and cylinder missing. ▊ Wear of injector causes poor fuel atomization, and increasing or decreasing fuel quantity or even not injecting fuel causes cylinder loss. ▊ If it is a high-pressure * * * rail engine, it may be a problem with the ECU of the engine computer board that leads to the lack of cylinder. There is another main reason why the engine is out of cylinder. Whether the quality of diesel meets the standard or not, too many impurities will cause engine wear, so remember to add conventional fuel and maintain the engine at ordinary times, which can greatly reduce the probability of short cylinder. Diagnosis and analysis of engine cylinder fault;

◆ The engine system was tested with a scan tool, and two fault codes, 18733 and 18736, were found, both of which were "fault-free descriptions".

◆ Perform fault code clearing, but neither fault code can be cleared. Continue the self-diagnosis of ABS system, and the fault code is 0 13 14.

◆ Analyzing the reasons, it is considered that it is related to the poor control of the engine system. For fault codes without fault description, it is generally caused by the fault of the working feedback signal of the actuator. Considering that the ESP warning light is always on, it is preliminarily analyzed that the car phenomenon is caused by the failure of throttle valve, fuel injector and ignition coil or poor signal transmission of related circuits.

◆ The ignition reads 0 1-08-062 throttle data, and the result is normal. Check whether the resistances of the primary coil, secondary coil and ignition coil of the fuel injector are normal.

◆ Measure the fuel injector power supply voltage of fuse S30, which is normal.

◆ Measure the power supply voltage of the ignition coil of the main relay, which is normal.

◆ Measure the grounding resistance of the ignition coil and find that the resistance is very high. The grounding point E642 is located under the air cleaner and is the common grounding point of the ignition coil and the fan motor. During the inspection, it was found that the lug of the grounding point was loose and the bolt was not tightened. Correctly handle the grounding point, tighten the bolts, and troubleshoot during trial operation.

I believe that some experts have experience in how to eliminate cylinder faults, that is, start the engine separately and unplug each ignition coil. For example, if the ignition coil of cylinder 1 is pulled out first, the engine will shake even more. Ok, this cylinder is working normally. Let the second cylinder test later. When the plug of No.2 steel ignition coil was unplugged, the engine was still shaking like that, and the shaking did not increase, indicating that the cylinder was gone. Now the lost cylinder can be found in this way. This is a local method. Now, the new method is to read which cylinder can't work with the diagnostic instrument. Similarly, first read whether the engine control unit has fault codes, such as: the fuel injector power supply voltage of that cylinder is disconnected, the ignition coil power supply is short-circuited to ground, and so on. If there is such a fault code, it is easy to troubleshoot. If it is an injector, you can only check the quality of the injector, the quality of the circuit and even the quality of the control unit. If it is a fault code of the ignition coil, check the ignition coil, wiring and engine computer, but what if there is no fault code? First, check the misfire rate of four cylinders with a diagnostic instrument, which is usually zero. If the number of cylinders is missing, it means the number of cylinders is missing. Knowing that the cylinders can't work, we can only rule them out one by one. First, check the spark plug, and remove the spark plug of the ignition coil to see if there is drowning. Let the rear spark plug check the ignition coil, put the spark plug on the conductive shell of the engine, don't touch the spark plug with your hand, and take a taxi to see if the spark plug gap jumps. The misfire is a problem with the spark plug or ignition coil circuit. If there is flashover, check the fuel injector. You can start the engine with a light connected to the two pins of the fuel injector to see if the light flashes. If yes, replace the fuel injector; Otherwise, it is pipeline and control unit. If there is no problem of oil and fire, it is a lack of cylinder. What you need to check is the machine. Measure the cylinder pressure to see if it is normal. If it is too low, it is the lack of cylinder caused by mechanical problems.

The lack of engine cylinder endangers the engine speed and power, which makes the excavator unable to work normally. The fuel consumption of the engine has increased and a lot of black smoke has been emitted. ▊ Intensifying the wear of engine parts will increase the heat, deteriorate the engine oil and shorten the service life of the engine oil.

Engine cylinder missing maintenance prompt:

The bolt of ignition coil grounding point is loose. With the extension of vehicle service time and the increase of fan rotation times, the oxidation of grounding point is intensified until the grounding resistance is very high, which leads to the failure of the ignition coil to form a normal current loop, which leads to the decrease of ignition energy and even the failure to ignite. @20 19