213切诺基故障

213切诺基故障 Analysis of black smoke failure caused by 213 Cherokee speeding up Fault phenomenon: 213, the speed of the Cherokee car does not go up, the exhaust pipe emits black smoke, and it needs to be cut off to take the car. After stopping more than 10 min, the oil is leaked into the exhaust pipe. After the platoon is discharged, the vehicle is returned to the aforementioned condition. In addition, this car start difficult, need to step on the two or three, the throttle to the car, the temperature rises, black smoke disappeared; valves have abnormal sound, but also special oil. Analysis: for 213, such carburetor cars in the engine running test, should be combined with exhaust gas analyzer, oscilloscope and other basic tools to adjust and repair. The combination of these two instruments can quickly determine the cause of black smoke failure due to lack of fire or too much oil. Not all black smoke is related to the carburetor. In acceleration, high pressure breaking fire also occurs black smoke, accelerate the phenomenon of weakness. In addition, 213 of the ignition coil after long-term use will cause internal breakdown, leading to weak fire. 213 the valve lifter of a car is a hydraulic tappet. The valve clearance is automatically injected by the injection of oil into the hydraulic valve and the valve clearance is automatically removed. So if the car is too dirty, poor quality oil and oil drain valve tappet and other reasons will cause the automatic valve clearance adjustment is not in place, resulting in valve abnormal sound, but the beginning of a car when the valve has a slight noise is a normal phenomenon. If the power of the car's engine drops and the carburetor is improperly adjusted, the carburetor's main bore will cause a lot of extra oil, not necessarily the oil spill. Cherokee car slow response, power shortage analysis Cherokee car slow response, power shortage analysis Failure cause The main reasons for the slow response and insufficient power of the engine are that the following should be paid attention to: (1) does the acceleration pump of the carburetor fail?. (2) whether the measuring rod in the main oil system of the carburetor is separated from the main measuring hole. (3) whether the oil level of float chamber is too low or too high. (4) whether the filter screen of gasoline filter is blocked. (5) whether the damper is bonded and not working well. (6) whether or not the carburetor is leaking. (7) is the measuring hole worn?. (8) is there a phenomenon of obstruction?. (9) if the gasoline pump fails, the pump oil is not enough. (10) whether the exhaust pipe is blocked. (11) is the cylinder pressure too low?. (12) is the engine overheated?. Removal method (1) if the acceleration performance of the pump is not good, it should check whether the lifting rod and its connecting parts fall off, and the reasons for the fall should be found and reassembled. If the upper and lower springs are bonded, necessary to be replaced, the pump membrane damage should be replaced in time, one-way valve stuck, should be repaired or replaced. After trimming, the piston pull rod should be pulled again and again to observe whether the pump oil is normal or not. It is necessary to check and replace the unqualified parts. (2) if the measuring rod does not deviate from the main measuring hole, it shall check whether the connection between the measuring rod and the lifting rod is loose, whether the measuring rod is stuck or hairpin, and the relevant parts are repaired or replaced according to the cause. (3) if the float chamber of the carburetor oil level is not correct, should be timely adjusted, will remove the carburetor bowl, and turning flat, with a steel ruler measuring instrument or at the top of the float and the carburetor body distance, if the distance is greater than or less than 15.2mm, which should be adjusted by bending or tie the float arm. (4) since the gasoline filter is a sealed tank, it does not need to be repaired at ordinary times. If the filter screen is blocked, the whole gasoline filter assembly shall be replaced. (5) the general vehicle shall be 48000km after cleaning choke system, cleaning choke shaft, the choke valve should be opened and closed freely, never because of oil and the choke valve movement blocked. If the gap between the choke valve and the carburetor inlet is not 7.1mm, the vacuum drive should be bent or stretched to adjust. (6) if the carburetor leaks around, check whether the gaskets on the carburetor, middle and lower parts are damaged, if damaged, should be replaced. If the gasket in the inlet pipe is damaged and leaking, the corresponding gasket should be replaced. If the connection screw is loose or the joint is loose, it should be re tightened. (7) if the main hole wear is too large, is the gap between the rod and the main metering orifice, is also the main orifice flow area increases, causing the mixture too thick, so that the engine power shortage, it should replace the main hole. If the air quantity hole is blocked by dust in the air, it should be cleaned and blown, and the hard metal can not be used to poke holes, so as to avoid scratching and enlarging the measuring holes. (8) if the air resistance, should check the fuel filter outlet is blocked. If the blockage, should be promptly cleaned, if invalid, should be replaced when necessary and replace gasoline filter, gasoline. General because of the steam inlet pipe or pump caused by high temperature gas resistance, gasoline pump can heat in the fuel pump and the exhaust pipe between the asbestos board, or by the cooling water pump in gasoline, the cab mounted a small bucket, with a plastic tube connected to the upper end of the gasoline pump, switch control water, cooling the gasoline pump, also can be used wet cooling cover at the petrol pump. (9) if the steam pump failure, such as inlet valve closed lax, rocker arm wear, diaphragm leakage, diaphragm spring elasticity decreased due to pump oil shortage, because of the steam pump is an integral type, not biodegradable, so as to confirm the gasoline pump failure, should replace the gasoline pump. (10) if the exhaust pipe is blocked, the exhaust system should be thoroughly cleaned and dredged. (11) if the long-term use of the engine, causing severe wear between the piston and the piston ring, the piston and the cylinder wall clearance is too large and flat, you should test the cylinder compression pressure, cylinder compression pressure set value should be 1068-1275kPa, the maximum pressure difference of 206kPa between the two cylinders. If the compression pressure does not meet the requirements, should be further examined whether the piston ring problem or cylinder wear, and if the piston damage or wear, should replace the piston and piston ring. If the cylinder is worn out, the boring cylinder shall be repaired according to the size of the repair, and then the piston and the piston ring shall be matched. (12) if the engine is overheated, check whether the cooling system is faulty, whether the thermostat is damaged, whether the fan belt is loose or broken, whether the pump is damaged or not, and repair or replace it in time according to the specific conditions. Analysis of acceleration and not easy starting of Cherokee electric vehicle Fault phenomenon: a Cherokee 2020E4 cylinder EFI car, climbing speed up slow, braking after starting difficult, driving in the crime phenomenon. Fault analysis: 2020E4 cylinder EFI Cherokee car is the original carburetor fuel supply improvement products, and its fuel supply and ignition mode is different from the carburetor type, The engine is centrally controlled by an engine computer (PCM). PCM receives signals from sensors and controls the actuators by calculation and analysis so as to achieve accurate control of fuel injection and control of ignition timing. The sensor includes a crankshaft position sensor (CPS), intake manifold absolute pressure sensor (MAP), intake manifold air temperature sensor (MAT), the cooling water temperature sensor, solar term door position sensor (VS), air conditioning, signal generator magnetic induction signal and the ignition circuit sensor and other sensors, these sensors are related with the fuel injection and ignition. The actuator includes an injector, an ignition coil, a gasoline pump, a relay, and an idle motor, all of which are related to acceleration and ignition of the car. The general fuel injection system has the following conditions: in the process of starting, warm machine, idle, idle copies (refer to the open air, turn and headlamps with load state), transition, acceleration, and deceleration economy, large load off the oil condition. The car fault occurs in accelerated conditions, PCM detected the solar term door position signal and the intake manifold absolute pressure signal suddenly increases, will increase the fuel injection pulse width, thereby increasing the fuel injection quantity, therefore in the repair process should first ensure the constant injection pressure, fuel injection nozzle pinhole should be clean, the engine should not leak vacuum. Under this premise, check the throttle position sensor and the intake manifold pressure sensor. You can use oscilloscope to see if there is a breakpoint, or you can use the code to retrieve the fault. In addition to the inspection of the automotive ignition system have lost fire phenomenon in high temperature, the spark plug gap is caused by excessive ignition energy decreased, in addition to check the engine computer heat is good, if the computer overheating will cause the ignition and fuel injection control error. Cherokee flameout fault Malfunction: a Cherokee suddenly turns its own fire on its way. When parking inspection, no abnormalities were found; once again, the vehicle started to run for less than 1Okm and switched off automatically; thus, the failure occurred repeatedly. Maintenance: according to the fault phenomenon, we first check the fuel supply situation and ignition system work, no exception. At first, the ignition module failed and the ignition module failed. Further examination and analysis, it is estimated that the fuel tank filter dirty caused by the fault. After the fuel tank filter is replaced, the malfunction disappears. Cherokee engine water temperature is too high Fault phenomenon A Beijing Jeep (BJ2021A6L) jeep, in the course of running, the water temperature is normal, but in the parking idle running, no air conditioning, 10min or so, the water temperature will rise to about 100 degrees celsius. Overhaul process First check the coolant is sufficient, the fan belt tightness is appropriate, but are normal; then suspected of the thermostat, then remove the thermostat into hot water test: when the water temperature reaches 90 DEG C, the thermostat starts to open, the thermostat is not fully open, the temperature of the water up to 100 DEG C, proving that the thermostat is good; then we also examined the main components of the cooling system, the water pump and radiator are all normal. At this point, make sure there is no problem with the cooling system. Because the car's transmission is fully automatic four speed transmission, The oil is also cooled by the radiator, and the oil pipeline passes through the radiator. So we checked the oil level of the transmission and found that its level was well above the "FULL" position. When we release a part of the transmission fluid, the liquid level is between "ADD" and "FULL", and then test, the coolant temperature has been kept at about 95 degrees, which meets the requirements of Cherokee automobile. fault analysis The reason is that when the fluid level of the transmission is too high, the oil is stirred violently by the gear to produce a large number of bubbles. The bubbles enter the oil circuit with the oil, which leads to the overheating of the oil, which makes the water temperature rise. But when the vehicle is running within the pump working fluid flow speed, flow through the radiator speed, and cooling effect on the vehicle when the wind speed has increased, the radiating effect is greatly improved, so the vehicles in the process of water temperature not too high. Jeep Jeep crankshaft pulley jump high voltage spark Fault phenomenon: a Beijing Jeep Cherokee after starting every five seconds, between the crank pulley outer edge and the body jump spark, two meters away from the car where you can hear the "cracking" jump in the bottom of the engine sound, can clearly see the spark. Troubleshooting: according to the fault analysis, the crankshaft pulley produces high voltage electricity, possibly due to the high voltage leakage from the high-pressure part of the ignition system to the crankshaft pulley. After inspection, each cylinder work well, rotor, distributor cap without damage. The replacement of spark plugs, high voltage lines, distributor assemblies, ignition coils, ignition controllers, and other electrical components related to high pressure fires still occurs. As a result, the crankshaft pulley is used to find the cause. The crankshaft pulley is provided with a torsion damping device, and the outer edge and the center are provided with a rubber layer which is insulated. Therefore, the high voltage on the crankshaft belt pulley may be the static electricity produced by the pulley and belt rubbing when the pulley rotates. Replace the belt, start the car, the fault disappears. Fault analysis: later learned that the car had broken pipes, temporary use waterproof tape wrapped, antifreeze steam coming out, the belt and chemical changes in the mild and soft, and the crankshaft pulley friction is easy to produce static electricity. Because the generator, air conditioning compressor pulley and the body is conductive, and when the contact belt, the charge transfer to the body, and the crankshaft pulley and crankshaft pulley body insulation, will continue to accumulate charge, causing the crankshaft pulley to the outer edge of the body jump spark.