1. A Bora in 02, after the rear-end collision (only the previous parts of the water tank were damaged), it was shaking during acceleration, which was very unstable. There is no fault detected by the computer.
Judgment:
1. Throttle gate is dirty, and after washing the solar terms and ji sumada, there is still this problem.
2. Intake flow sensor, still not good after washing
3. After removing the high-pressure coil, I found that the three-cylinder coil had a bit of a smell, and there was no problem with everything else. It was good after changing a new one, however, it still didn't work after going out for a round, and then looked for the high-pressure coil again. Some of them found the smell of hu qi again in the second cylinder, and replaced the second cylinder with a new high-pressure coil again, it still doesn't work after the test run.
4. Measure the oil pressure. The gasoline pressure gauge shows that the oil pressure is normal, but the problem is still not solved.
5. Oxygen sensor, there is still no change after the replacement.
6. There may be a problem with the fuel injection nozzle, but the problem is still not solved after the nozzle is corrected.
7. It is recommended that car owners go to 4S service station for inspection and inspection. After that, the service station could not detect it and could not determine the final reason.
In the end, there was really no way to open the back chair accidentally. Floater found that there was a crack in the floater from oil outlet nozzel, and there was also a crack in the back row. The decisive replacement consists of floater assembly. The problem has been solved.
The experience obtained is that the judgment of faults cannot depend on instruments. The confidence probability of instruments can only be within 20%, and the remaining 80% should be done, discovered and groped by themselves.
2. An automatic three-compartment Buick Sail is turned off during normal driving, and it will never catch fire again.
Judgment 1. The gasoline pump core is not oiled. Use the external power supply to test the gasoline pump core to be normal. Exclude pump core. Check the gasoline pump relay and find that the relay is not broken. Find high pressure fire again. It is found that all the high pressure is on fire, neither oil nor fire, it shows that the engine computer is faulty. If there is a problem with the engine computer, the fault can be detected by using the car detection computer, while using two car fault detection computers both show that the electrical component system is free of faults, for the time being, I believe that the computer will be tested once, and the engine computer failure will be temporarily eliminated.
Judge 2. Listen carefully to the movement of the engine pulled by the motor and it seems that there is no cylinder pressure. The consideration is: the timing belt climbs teeth, or is disconnected. When the timing is opened, it is found that the belt does not climb teeth or disconnect belt case, but the timing belt bull wheel of the crankshaft is short, so because the crankshaft position sensor is wrong, the cylinder loses pressure and the belt idles, resulting in abnormal engine movement and movement, and the crankshaft position sensor is wrong, resulting in no fire and no oil in the engine.
3. A sedan Bell is handsome.
After the water is flooded, the connecting rod of cylinder 2 and 3 is rammed and bent. (the connecting rod is rammed and unrammed. Take a look at its piston and the upper fulcrum of the cylinder to know whether it is flat or uneven, if it is horizontal, it means that it has not been smashed; Similarly, if it is not horizontal, it means that it has been smashed). After the overhaul, the fire cannot be put on the gear, and the fire can only be put on after it is turned off,
Judgment 1. The combination oil is missing, and it has not changed after adding the oil. Finally, the gear oil problem is solved.
4. Bmw 528 suddenly showed that the water temperature was over.
Judgment: 1, water temperature sensing plug, 2, oil pressure fan, 3, thermostat, 4, water pump, water temperature induction changed, did not solve the problem.
Finally, I changed the thermostat decisively, and the problem was solved.
5. Chery qiyun, suddenly shut down when driving normally, and then the battery shows no electricity.
Judgment: 1. The generator does not generate electricity, 2. Battery feed, 3. Line leakage, power running or power consumption.
Test and exclude: the generator generates electricity normally, the battery is replaced, and the problem is not solved. Finally, it is found that the generator sometimes does not generate electricity. After the fire, the throttle is added to more than 3000 revolutions before generating electricity, note that the positive fire line controlled by the key door of the generator regulator is disconnected. Follow the fire line of the generator regulator to find the battery indicator line of the dashboard, which must be broken. Just find the connection, or find another wire to add. One end of the wire is connected to the fire wire controlled by the key, and the other end of the wire is connected to the positive fire wire of the generator regulator, which can also solve the problem.
6. It is very difficult for Changhe bread to catch fire after the hot car. The cold car is good,
The problem was solved after the starter was replaced decisively.
VII. Nissan pickup truck, I can't get the car after finishing it from the repair shop outside
Judgment: 1. Distributor block, 2. Ignition coil, 3. Timing with Wu;
Solved, distributor block changed, it's useless; The ignition coil still doesn't work, and there is no error in timing.
Finally, boldly Turn ignition wire upside down (the original number of times of arrangement of ignition wire is 1 3 4 2 upside down and 1 2 4 3 in turn), in fact, the ignition order of nissan pickup truck is reversed from that of most cars. The repair shop made a mistake when changing ignition wire. In fact, not only is the ignition order of this type of car like this, there should be a small number of cars like this. Most models are 1 3 4 2.
8. After The Buick sedan sail flooded, the water of the engine did not catch fire after all the water was discharged, and the fire and oil were detected.
Judgment: 1. Timing wrong teeth or broken columns, 2. Engine computer may be burned.
Exclusion: normal timing is found,
Solution: Use the car fault detection computer to detect, and the detection shows that the login is unsuccessful and the engine component system cannot be entered. It is confirmed that the water of the transmitter computer was burnt down, resulting in no high pressure fire of the engine, no gasoline pressure and no fire. After replacing the new engine computer, it worked normally. The problem is solved.
9. After the volvo S80 was completely installed after the blower was removed and washed, the air blower switch was opened, but the blower did not work at all.
Judgment: 1. Improper assembly, 2. There is a problem with blower relay and insurance,
Troubleshooting: check the assembly again and check the relay and insurance again. It shows that there is no fault exception.
Solution: Finally, the battery of the car is being extremely removed. After half a minute, it will be installed as it is. Try again and there will be no problem. (It seems that when removing its electrical hardware, it needs the matching of the car computer. When removing the positive end of the battery, it needs to open the key door of the car to the third gear, that is, when all the instrument lights are on; when installing the positive end of the battery, you need to close the key door to the bottom). The disassembly and assembly of the battery of a high-grade car to match its original car itself is a very imminent step, which cannot be easily ignored or given up.
Ten, a beijing hyundai elantra, after the replacement of steering gear box in other repair shops, found that the electric horn did not ring, the dashboard airbag lights were on, and the display airbag was abnormal.
Judgment: 1. The steering wheel oil silk may be accidentally twisted when replacing steering gear box
Troubleshooting: after replacing the new steering wheel oil silk, it was all normal.
Experience: When disassembling airbag with steering gear box models, be sure to pay attention to the steering wheel oil silk, and remember to hold steering gear box before disassembling steering wheel lock, in this way, the steering wheel oil Silk will not be broken.
11. Volvo S 80, there is a noise of the right front chassis giggling when driving in the same place and direction. But I can't tell what exactly caused it.
The first judgment is:
1. Shock absorber pressure bearing, it is still not good to replace it with a new one
2. Shock absorber, it can't be changed.
3. Steering gear box. The directional pull rod, subframe sets, and damper spring have been changed once, but the result is not good.
Finally, I changed a triangle Wall (because his triangle wall just changed for three or four days, such a problem occurred, and I didn't consider it at that time, so I ignored it)
12. Mercedes-benz M100 van, the engine is stuffy when driving at high speed, and this situation occurs when it is more than 50 miles. It seems that it cannot be oiled, but it is especially normal to refuel in the parking state.
First of all, the mistakes in the experiment are: 1, gasoline pump, 2, throttle gate, 3, air flow meter, 4, and vacuum tube. It is not good to change them one by one.
Finally: If the nozzle is changed (cleaned), this kind of problem will not occur. The refueling is particularly smooth, and the speed is above 120 miles per hour.
Thirteen, Volvo S80 T6, after one month of overhaul, it was found that the whole exhaust pipe was very strong with thick white smoke,
Judged as: 1. One of the worm gear supercharger is broken
2. A matching error occurred on the car computer.
The result is: 1. One of the worm gear supercharger is broken.
14. A land tiger basket wins. When the rear drive differential (transfer case) is replaced, the front drive or rear drive will not be used to drive the driving gear or reverse gear.
The judgment is: This car is more than 2 million cars, no one is afraid to determine the cause of blind judgment, just doubt, probably, possible; But there is no blind action, just consider: 1, is there anything wrong with the assembly? 2. Is the shaft gasket thickened?
The result was: I asked a professional technician in shenzhen by phone, and said that I would beat the gearbox and the plug-in speed device with a wrench for a few times, and the result would be fine. (I don't know why, the reason is not good).
Fifteen, Beijing Jeep 213, after the water temperature is high, (caused by the rupture of the downcomer), the fire sounds like air exhaust manifold leaks.
The judgment is: exhaust branch pipe pad is damaged, but the result is not.
The result is: the cylinder gasket is cracked after the water temperature is high.
16. Dodge business in the united states, after refueling in the air, the tachometer was too high due to too much refueling and too long time. Suddenly I heard the crash of the engine, much like the sound of the valve.
It is judged that the piston pin may be loosened or dumped due to the high engine speed.
The result is: the connecting rod tile of the five cylinders is dislocated, and the connecting rod is installed. After the tile cover is tightly installed, it is found that there is still a little gap between the tiles. Then, replace the cylinder hall cylinder, grinding shaft with plus-sized tiles and piston. Or replace new crankshaft, large and small tiles.
17. After the overhaul of one (Passat B5), the engine began to catch fire for 3 minutes and then the engine oil trouble light began to alarm.
It is judged that the oil pressure is insufficient, the cylinder head oil passage is blocked, and the oil pressure valve pressure is insufficient,
The result is: the oil pump is broken, after replacing the oil pump.
There was no problem in the whole morning when the idle speed caught fire. After the test engine was loaded, there was a loud sound again. However, it was different from the previous situation. The difference was that there was no alarm for the engine oil alarm lamp after the sound appeared this time, the cylinder head has been lifted for 5,6 times without any effect.
The result is: camshaft tensioner is broken
18. One model (Volvo S80) cannot be added after the gearbox is replaced. It can run up to 80 miles.
The initial solution is: nozzle, gasoline pump, throttle gate, gearbox magnetic valve, all have been tried, and the problem has not been solved.
The final result is that the three-way catalytic package is blocked tightly.
19. A chang'an star electronic spray bread suddenly stopped on fire the next day during normal exercise
In the judgment, it was found that there was fire and oil, and the timing was correct. The throttle gate was not very hidden. Later, the spark plug was burnt red with fire to help the fire, and then it was on. However, when the fire was on fire, it was air inlet fired, and the noise is very loud, and the sound of breaking the two cylinders high pressure fire is obviously reduced.
The judgment is: the cylinder gasket of the second cylinder may be damaged. After lifting it, no damage marks are found, and no abnormality occurs in the valve,
The result is that the camshaft two cylinder is seriously worn.
20. Minibus timing comparison:
When the crankshaft and camshaft Mark positions are both at the upper pivot point, its valve needs to be one cylinder closed and four cylinders open.
Therefore, when adjusting the valve, when timing mark are all on the upper pivot point, you need to adjust the inlet exhaust valve of the four cylinders, and then turn the timing clockwise. When the timing mark of the camshaft turns to 180 degrees, it is the timing of one cylinder, at this time, adjust a cylinder of exhaust valve.
21. Valve adjustment of four-cylinder car:
Adjust the valve of one cylinder when timing is on the fulcrum of one cylinder, and adjust the valve of one cylinder and two cylinders for exhaust. Exhaust Valve need to adjust one or three cylinder: then adjust the four cylinder valve. When adjusting the four cylinder valve, generally, when the crankshaft is on the fulcrum of one cylinder, turn clockwise, its camshaft will turn half a circle, that is to say, the mark point of the camshaft at this time is exactly 180 degrees of the fulcrum on a cylinder. Only then can the inlet and exhaust valve of the four cylinders be adjusted. At this time, exhaust need to be adjusted three, four cylinders, exhaust valve need to adjust two or four cylinders. Except for individual models.
22. A Chery Fengyun added some cold water after the high temperature in winter, and then found that the exhaust pipe was full of thick blue smoke.
Judgment:
For the first time, the cylinder mat was damaged by high temperature and high pressure after high temperature, but the result was not.
The second time, valve seal of the disassembly was burnt out, but the result was still wrong.
For the third time, the high temperature cylinder has been disassembled and installed, and the cylinder has lost its round piston ring sealing defect, resulting in oil loading, and the result is still wrong.
Result: the cylinder cover the Inlet oil passage of the second cylinder broke, resulting in very severe oil burning, and the spark plug of the second cylinder was always submerged by the oil and caught fire.
Twenty-three, a shanghai huapu four-cylinder electric injection toyota 8A engine meilu
I couldn't catch fire in the morning, only the car dragged the fire for the second time, and it was very good to catch fire one day later, but I still couldn't catch fire the next day. The engine has fire and oil, the battery has electricity, starter is normal, the timing is correct, the spark plug is new, anti-theft removal,
Result: water temperature sensing plug is broken.
24. Toyota previa, the engine oil light suddenly turned on. Check whether the engine oil is not clear and the engine oil filter screen is not blocked, but mobile oil reaction plug does not contain oil.
Judgment: there is a problem with the oil pump, but the result is not. Its oil pump is gear, which is easy to break,
Result: the oil pan was put over the bottom and the oil filter screen was firmly stuck, and the oil pump would not absorb the oil. So the oil light will be on, and the place where the bottom shell goes in will be solved.
