Automobile fault maintenance formula

The oil and gas truck is too thick to shoot, the black smoke is rolling, and the oil star falls off;

The running time is a little longer, which makes it difficult after flameout;

First, check whether the choke valve is completely closed;

Look at the float oil level again, the needle valve is stuck and the oil rises;

There are only two simple problems, so go straight to the point and get rid of them.

Second, the bolt ring

The pin ring is brittle, the idle speed is slightly higher and the noise is heavy;

The sound of temperature rise is unchanged, and the sound of fire break test is heavy;

This kind of fault develops rapidly, and it will be removed in time as soon as it is discovered.

Third, the piston hits the cylinder.

When the piston hits the cylinder, the sound is clear, the rotation speed increases slightly, and there is no sound;

Shake the throttle downward at a medium speed, and there will be a continuous knocking sound;

There is no sound of cold car and hot car, which is generally feasible;

If the temperature is too high, stop and trim it.

Fourth, check items before driving.

Whether the oil and water in the fuel, hydraulic lubricating oil and gas path leak;

Instrument lighting signal system, switch wiper parking device;

Steering brake transmission shaft, tire rear axle traction hook;

Look at the blinds before opening and closing. The load and traction should be reasonable.

Five, half shaft fracture

A person drives a car and a person sees if the transmission can turn;

If the drive slewing car doesn't work, the half shaft must be broken at this time;

The transmission is not moving. Looking forward to the future, the failure of the transfer clutch exists.

Six, connecting rod bearing ring

The knocking sound of connecting rod bearing makes the sound of medium-speed driving clearer;

Continuous brief metal crash when suddenly accelerating and decelerating;

The sound of single cylinder fire is weak, and the sound of ignition recovery is heavy;

It is not difficult to stop in time when this kind of fault occurs.

Seven, spindle bearing ring

The spindle tile makes a muffled sound, and the rising speed makes the sound louder;

When the load increases, the noise becomes louder and the oil pressure rushes down;

Single cylinder fire is not obvious, and double cylinders are silent;

In case of such a major fault, timely flameout analysis;

If you don't care about driving, you will have an accident.

Eight, delayed ignition

The vehicle does not start well, and the voice is muffled and screaming;

The phenomenon is a bit too strong, but the ignition is slow and the front of the car is adjusted.

Nine, the asking price is too high

Overcharging is simple and the fault range is not wide;

First, check the regulator, and the breakdown short-circuit electricity is not limited;

The voltage is fully excited by the excitation line, and the headlight string can be used at this time;

Emergency driving is safe and will be replaced in the area.

X. Small charges

There are three points when charging is too small, and excitation adjustment is the key;

The crystal on the rectifier board is bad, and there are only a few good components;

The belt is too loose and the charge is small. First, check it.

Three characteristics of crystal damage, breakdown and leakage;

In either case, the car can only be slightly charged.

Eleven, lack of cylinder

Vehicle cylinder fault list, open the hood to see the cylinder line;

The cylinder line is not leaking, so it is likely to be rainy and wet;

If there is no disconnection and leakage, the spark plug will have problems;

It is not difficult to find out whether it is damaged and replace it with a new one.

Twelve, the clutch can not be separated.

Power transmission is unstable, and the clutch does not always move forward;

At this time, the lever is unbalanced, and it is connected while being disconnected;

Open the oil bottom to observe clearly, and adjust the bracket with the horizontal tie rod;

Lift the clutch bearing and stop, and step on the active clutch;

When adjusting the free travel, the car can move forward.

Thirteen, no oil

It is not difficult to remove the oil fault, the oil in the tank is real;

Whether the switch is fully opened or not, the filter is blocked;

Check whether the oil pipe leaks and the oil pump is damaged;

Lift the outer rocker arm, and the carburetor has no oil;

The front fault does not exist, and the needle valve float is stuck;

Look at the interface screen first, clear the blockage and turn.

Fourteen, no charge

If you find that the vehicle is not charged, first look at the belt;

If there is no electricity in the excitation circuit, the ignition switch will be cut off;

If it cannot be charged, check the output power cord;

If there is no problem above, continue to check the adjusting parts;

Car maintenance is so good, and the maintenance master WeChat is good;

The replacement test is not enough, and the motor damage is inevitable;

If the stator coil is grounded, the whole coil should be replaced;

If the rectifier circuit is broken, the car will not be charged;

The coil is well rectified, so look at the terminal carefully.

Fifteen, low pressure off the road

Low voltage open circuit is not difficult to arrange and easy to find;

Check the test lamp of the circuit and disconnect the circuit before the lamp is on;

Modern electronics are used more and more, and judgment is blind;

The sensor and high resistance meter of EFI vehicle must be brought;

If you don't follow this rule, trouble will keep coming.

Sixteen, hydraulic brake clutch

The hydraulic system has gas storage, so braking is difficult to use;

Check the oil level first, and the exhaust sequence is from far to near;

Oil products cannot be mixed, otherwise the leather cups will all be invalid;

Please be clear-headed and transport thousands of miles safely.

Seventeen, battery.

When the vehicle is disassembled, the positive and negative poles are clearly separated;

Modern alternator, negative grounding stereotypes;

Don't make a mistake about polarity, once the installation is wrong, it will cause heavy losses;

Burn out the generator first, and it will burn red for a long time.

Eighteen, spring driving "six prevention"

One is to prevent spring breeze and dust, and the other is to prevent drowsiness and lack of oxygen in spring.

The three-proof spring rain car is out of control, and the four-proof spring warmth is easy to get stuck.

Five precautions against the increase of tourists in spring, and six precautions against the excitement in spring.

Nineteen, the "misunderstanding" of automobile adjustment

The ignition time is easy to be adjusted in advance, and the valve clearance is easy to be adjusted.

The tire pressure is easy to inflate and the fan belt is easy to adjust.

Insurance replacement is easy to change, and tire screws are forced to pry.

Twenty, the circuit with iron.

Automobile electrical system failure, smoke, sparks;

The burnt taste becomes abnormal at high temperature, and the five senses have strong sensory information;

At this time, quickly disconnect the battery line to prevent easy hand burns;

Find out which wire is burning and trace the fault.

Twenty-one, the cause and effect of tire "short-lived"

Tire inflation exceeds the amount, and it is easy to get injured when overloaded;

Insufficient inflation, folding on both sides, slightly longer time and more cracks;

If the brakes are not good, the hub will heat up and the tires will easily explode;

Careless driving on a stone can easily cut the tire and shrink it;

Improper positioning of the front wheel will wear the tire crown inside and outside;

Twenty-two, the idle speed is unstable

It is common that the exhaust pipe head shakes and the cylinder does not work.

Test the fire and oil cut-off certificate, check the ignition and check the fuel injection.

The vacuum leak pipe is not inserted correctly, please check it one by one.

Inaccurate ignition timing and disordered exhaust gas circulation.

Idle valve of throttle body, clean and adjust to the set value.

The oil-gas ratio should be appropriate, and it is not good to be too rich or too thin.

See if there is a regulator and whether the closed loop works well.

Fault code to data flow, detailed analysis of exhaust gas measurement.

If the cylinder pressure is too low, the valve cylinder gasket piston ring.

Wrong valve timing mark, small or no valve clearance.

The spring is too soft and carbon deposits are too much, and the valve hairpin returns slowly.

Variable valve timing valve, too dirty oil will send cards.

Balance the shaft into the foot pad, and check and proofread it properly.

Twenty-three, the idle speed is too high

How to check the idle speed is too high? The amount of mixed gas entering the cylinder.

What are the air intake passages? Throttle to idle valve,

Bypass airway additional valve, steering acceleration air valve,

Vacuum leakage of cylinder ventilation check valve and intake manifold.

The throttle does not return, and the idle motor has issued a card.

Carefully check, clean, adjust and set the control circuit.

The water temperature is controlled to idle quickly, and the water temperature is low when the waterway is blocked.

Switch signal electrical load, air conditioning, gear and steering.

Ignition should be adjusted early, and the voltage is low due to insufficient charging.

The study plan is strictly implemented. Try changing computers.

develop

For the lifting function of the window, it can meet our requirements for the window, and the window can be adjusted automatically, which is a very convenient function. But what if the lifting function of the window doesn't work?

After long-term use of vehicles, due to rubber aging, dust accumulation and other reasons, the rubber guide groove of window glass often rises slowly or stagnates when it rises to a certain position. If it rises to a certain position with anti-pinch function, it will automatically fall back, even if you pull the switch. Some windows will tilt to one side when they rise, making it difficult to rise. There is also a sudden lack of automatic upgrade function, so you can't lock the automatic window with a key or remote control, and you can't automatically lower the window when you unlock it.

Don't worry about these situations. I'll teach you how to solve all kinds of problems of window glass upgrade without spending a penny. First of all, teach you how to solve the problems of glass skew, difficulty in lifting, automatic falling when lifting, etc. Most of these problems are caused by excessive dust and other stolen goods in the glass guide groove and increased resistance.

What we need to do is to clean the dirt in the glass guide groove. The tools used are simple: a chopstick, a small towel and a basin of water. After the towel gets wet, twist it and wrap it around one end of chopsticks to make a cleaning tool. When the towel is dirty, take it down and wipe it clean, and then wrap it up for later use.

Put the chopsticks wrapped with towels into the glass guide groove, and the number of layers of chopsticks wrapped with towels can be appropriately increased or decreased according to the width of the guide groove to make the thickness moderate. Pull up and down in the guide groove vigorously to clean up, and constantly take down the towel to clean the stolen goods washed on it until the stolen goods can't be cleaned.

After cleaning, it would be great if you happen to maintain the wax inside. Spray a little on each glass guide groove, and the effect will be better.

This cleaning can solve more than 90% of the problems, and a small part is caused by the problems of the glass lifting motor or the glass lifting mechanism. This method can improve the upgrade problem, but it can't completely solve it. If it is to be completely solved, it must be repaired or replaced at the maintenance station.

Secondly, under the condition of no automatic upgrade function, the window can't be automatically raised by locking with a key or a remote controller, and the problem that the window can't be automatically closed by unlocking can be better solved, because this situation is generally caused by the loss of initialization data of the window due to battery power failure, disconnecting the power supply or ground wire of the window control module when maintaining other systems, and starting the engine when the power supply is serious. As long as each window is reinitialized, the problem can be solved.

The general initialization method is to turn on the ignition switch, pull the switch up and hold it. After the glass rises to the top, continue to pull for more than 3 seconds. Release the switch, immediately hold it down, and let the glass fall to the bottom for more than 3 seconds. Pull the switch up again and hold it. After the glass rises to the top, continue to pull for more than 3 seconds. After the initialization is completed, the original function of the window can be restored.

As for the damage of the window lifting function, you can actually repair it yourself, or you can avoid going to the 4S shop for repair, which can save a lot of money. Have you learned the above methods?

After the car is repaired, many car owners directly choose to drive out. Now I want to tell you that this is not possible, because after the car is repaired, there is no way to directly rule out the omission in the maintenance process, which has caused great safety hazards to the car. Let's take a look today. What should we do after the car is repaired?

Static inspection

When checking, park the vehicle on a flat road and check it in the following order:

1, observe the appearance of the vehicle, stand in front of the front of the vehicle, and check whether the cab, hood, left and right fenders, front bumper, etc. All straight men. If it is unfair, there are usually the following factors: the air pressure of the left and right tires is inconsistent, the left and right springs and shock absorbers, and the frame or fender are deformed.

2. Before getting to the car, check whether the bumper and towing hook are firm, whether there are concave-convex cracks in the radiator guard, hood, fender and cab, whether the connecting bolts are firm and whether the headlights are installed firmly.

3. Enter the cab to check whether the door switch is light, whether the door and window glass are flexible, whether the pedal is firmly installed, and check whether the front windshield is cracked.

4. After arriving at the car, observe whether the car is upright and whether the taillights, brake lights and license plates are installed firmly.

5. Check the installation of fuel tank and spare tire.

Check while driving

The purpose of driving inspection is to check the comprehensive performance of each assembly part of the vehicle, and the operation should be particularly cautious and pay attention to safety. The items and order are as follows:

1, before starting, the engine should reach the normal temperature and check the working condition of the instrument.

2. Check the clutch. The clutch should be completely separated, and the engagement should be stable and reliable, without shaking and abnormal sound.

3. Drive at a low speed of 2 to 3 kilometers, so that the temperature of each part of the chassis rises to normal, and pay attention to whether there is abnormal noise in each part. Step on the brake pedal lightly, test whether the brake is flexible and effective, and then speed up. Direction system should be light and flexible, without deviation.

4. Choose a suitable venue and check the minimum turning radius of the vehicle, which must comply with the provisions of the original vehicle.

5. When accelerating or decelerating, pay attention to the sound of gearbox, clutch, transmission shaft and differential. Slight noise is allowed in different gears at different speeds, but knocking is not allowed; In any gear, when the speed changes suddenly, the gear is allowed to have an instantaneous knocking sound; When driving normally, the transmission shaft must not make noise.

Don't go on the road immediately after car maintenance. You should check according to the above method to avoid accidents caused by omissions in maintenance. It's your duty to do that.