What should I pay attention to when preparing to buy a second-hand Jetta car in the near future?
Look at the appearance:
Mainly depends on whether the paint on the car is different in color in the sun and whether there is a contrast. If so, it is the damage caused by various reasons and has been repaired by painting.
Or we can knock on the four doors of the car by hand and listen to the knock. Through this simple method, we can roughly judge the repaired place and the painted place: the knocking sound is dull and the unpatched place is crisp. A thin, thick voice, I believe you can tell.
If you see the whole body color is exactly the same, and the paint surface is as bright as new, you should also pay more attention. This car may have been refurbished and repainted by a Bug. This needs to be judged by the age of the car. If the car has been used for more than 5 years and the paint is as bright as new, it is doubtful.
Vehicles with serious accidents, such as serious collision, rolling and other serious accidents. This kind of vehicle with deformed frame, after "professional" repair, is hard to see from the appearance.
We can judge whether the car has had a major accident by a simple method: look at whether the front and rear license plates are in good condition. If there are many white spots and obvious knock marks on the license plate, it can be concluded that the front and rear parts of the car have been violently collided. This is because a new license costs 200 yuan, and "bugs" are rarely willing to spend this money for a damaged license.
In addition, the front and rear lights and steering should also be carefully checked. See if there is a comparison between the old and the new. Later, it was replaced with a new one, and the old one belonged to the original car. Don't think that the new one is a good car, but the new one may be a "bug" that has changed the accessories of the deputy factory.
Open the cover and see if there is any welding near the water tank. The place after welding is obvious, and there are traces of being knocked around. Uneven places can be observed with the naked eye. Open and close the cover several times to see if it fits completely.
Open the trunk again to see if there is any welding repair on the upper part of the bumper. Open and close the trunk lid several times to see if the opening and closing actions are smooth.
If the above negative situation occurs, it means that the car has been hit hard and the frame has been deformed.
When looking at the appearance, pay special attention to the condition of the tire hub. Usually, the service life of a car is directly proportional to the degree of tire tread wear.
To put it simply, the car has been used for five years, but the "bug" says that the car only ran 20 thousand kilometers. As evidence, the tire pattern is very new. Can you believe his story? I'll teach you a trick.
After driving for about 5 years, even if it is used less at ordinary times, the pattern wear is not serious, and the life of rubber is very long. If the tire is exposed to sunlight and rain, silicon cracking will occur after a certain number of years. So many car dealers changed the wheels of their cars to cover up the actual mileage of their cars.
By the way, the odometer kilometers of the car are for reference only, and most of them have been adjusted by "bugs".
Then, is the tire hub replaced by "Bug" a new product purchased from formal channels? I'll wipe your eyes for you to take a closer look.
When we observe the tire, we should not only pay attention to the tire pattern, but also pay attention to the tire side. The most vulnerable part of the tire is the side. When you observe a bulge, it is absolutely useless.
Only when it is strongly squeezed by the outside world will the thin sidewall be impacted and the protective line in the tire be squeezed out. This kind of tire will be dangerous if it continues to be used. There will be a flat tire.
This kind of second-hand tire is also bought at a low price by "bugs". I don't know how many times this tire has been mended. If it is a hot repair, it can be installed on the rear wheel and can also be used. However, it is absolutely useless to find repairs or bumps on the side of the tire.
If you find that the tire pattern is deep and there is no bulge on the side, it may not be a good tire. The legendary tire retreading is probably what you see before your eyes!
What is tire retreading? The tire tread is basically smooth, and the life of the tire should be over. The tire is worn to such an extent that if the pattern is re-engraved on such a tire, it is not inferior to the pattern depth of the new tire, and the danger can be imagined.
This kind of tire runs on the road, not to mention being squeezed, even a sharp stone will puncture the tire! It's creepy to think about it.
I'll teach you how to tell if a tire has been refurbished: be sure to look at the pattern carefully. The tread lines of the new tires are neat and straight. The tread of tires refurbished by small workshops is irregular, and the tread is usually not straight. Moreover, new tires will have rubber Mao Mao, commonly known as fetal hair, while retreaded tires will definitely not.
And the hub can not be ignored, and the shiny hub is likely to hide the murder! "Bug Bug" will also renovate the wheel hub to make a blind eye. "
Some wheels are rims, which are the most common and cheapest wheels. They usually use aluminum alloy wheels instead of steel rings. Most of the replaced wheels are second-hand. These wheels are somewhat damaged, which has an impact on the use, but the price is very cheap.
The process of refurbishing the wheel hub is very simple. "Bug" uses putty to repair some hard parts on the wheel hub after collision, and polishes them with water sandpaper. The next step is painting.
The process required for conventional painting on the wheel hub is quite high. It is quite expensive to finish it in a clean room with high temperature paint. "Bug" did use cheap automatic painting to complete the painting.
After the transformation, it looks the same as the new hub, but the hidden danger is really in your driving!
When the damaged wheel hub is installed on the vehicle, the seal between the tire and the wheel hub will be lax, and there will be the possibility of air leakage after driving for a long time.
Next, I will teach you how to expose such a scam in public: the wheel hub is made of aluminum alloy, and the repair is made of putty, also called putty. The adhesion of putty to aluminum alloy is weak. Press the hub hard with your nails. If there are nail marks, you will understand the hardness between putty and metal.
Some wheels also have a lot of lead blocks, so you should also pay attention. These lead blocks are used for tire dynamic balance. The more lead blocks there are, the more places where the hub is not round. In other words, the possibility of wheel hub deformation is very high, so we should not be careless.
The interior can also be renovated. A healthy and clean interior is the environment you face directly when you travel comfortably. The interior can do a little less than the engine and appearance, but it can't be ignored.
Interior decoration
A car in good condition will have a clean and shiny interior. All parts of the instrument panel and fittings on the door panel shall be free from damage. Glue, floor mats and seat covers are available.
The interior, instrument panel and door panel are all cleaned and sprayed with wax. You find that the seat covers are very new, and the floor mats and mats are also very new. This is another doubt. A five-year-old car, why are there so many new decorations?
This is also "selling dog meat by hanging sheep's head" to cheat you.
It's not hard to see through this. First of all, let's take off the seat cover and see if there are any holes and other damaged places in the seat of the original car. Compare the left and right seats to see if they are a pair.
The floor mats and mats have been replaced with new ones. These floor mats and mats have also been replaced by "bugs" with low prices and slightly inferior materials. When you really buy it back, you will know that you will be dizzy by the smell of floor glue and floor mat in less than a week. Two weeks later, I found that the rubber was torn and so on.
All kinds of accessories on the dashboard and door panel are complete. We might as well take a closer look at whether there is a difference between the old and the new and the color contrast. What is new is the accessory of the deputy factory that was replaced later. Accessories factory accessories are usually very cheap, but there will be subtle differences in size compared with the main factory.
These accessories will not fit perfectly when installed, and the color tips are different, so they are not smooth to use. We can use the manual air outlet, lift the glass and so on to feel it.
All kinds of accessories on the dashboard and door panel are complete. We might as well take a closer look at whether there is a difference between the old and the new and the color contrast. What is new is the accessory of the deputy factory that was replaced later. Accessories factory accessories are usually very cheap, but there will be subtle differences in size compared with the main factory.
These accessories will not fit perfectly when installed, and the color tips are different, so they are not smooth to use. We can use the manual air outlet, lift the glass and so on to feel it.
Engine is the core component of the car body, and it is also the most expensive component. It is an exaggeration to say that a used car is worth buying as long as its engine is in good condition. But how to test whether the performance of the engine is good? What tricks did the car bug use to fool your eyes? Please see our next story.
engine
Experienced people can distinguish the quality of an engine by listening to the sound, watching the idle speed and watching the exhaust gas. And when you don't know anything, there are simple ways, that is, big throttle, high speed and eyes.
The state of the engine is not determined by listening to the sound of the car and letting the "bugs" use the manual throttle line. Just listen to the sound of the engine when refueling and listen to what they say.
Practice is the most important thing. We use our feet to step on the accelerator more and increase the engine speed as quickly as possible. And pause for a few seconds at high speed, and the abnormal sound of the engine can only be heard at such high speed.
Let the speed of the car reach 4000 or 5000 rpm, and repeat several times. See if the pointer of the tachometer can reach the standard 750 rpm at idle speed (plus or minus 50 rpm is allowed).
Observe carefully whether the exhaust gas from the exhaust pipe is blue smoke, black smoke or white smoke.
If it is blue smoke, it means burning oil. That is to say, the clearance between the piston and the cylinder wall inside the engine is too large, and the valve oil seal leaks oil. Simply put, it's time for an overhaul.
If it is burning black smoke, it means that the engine has a lot of carbon deposition, or the nozzle atomization is very poor. This phenomenon will occur when the mixer in the combustion chamber is too rich. There are many places that need to be repaired.
It is best to emit white smoke and water, indicating that the combustion is good and the engine is in good condition.
If you can't feel the color difference, you can use your palm to test it by hand at a distance of 5 cm from the exhaust pipe. If blue smoke comes out, oil mist will come out of your palm. If it is black smoke, your palm will be blackened. If it is white smoke, there will be a mist of gas on your palm.
These methods can be used if the "worm" has not tampered with the engine. But the following situation is not easy to judge.
"Bug" will use the method of crossing the sea to make the terrible engine emit white smoke and water, which proves that the engine burns well. The props used are "cooking oil" and "wet sponge"!
Add cooking oil to the engine: the smoke from practical oil is white.
But the viscosity of edible oil is far less than that of automobile oil. If the engine is continuously tested at high speed at this time, it won't be long before the engine will burst and boil due to poor lubrication.
Whether the combustion of the engine and the atomization of gasoline are smooth is usually judged by the water sprayed from the exhaust pipe. Let a terrible engine spray water and then use a wet sponge.
The exhaust pipe is plugged into the wet sea surface: the discharged water is actually the water of the wet sponge itself.
Adding cooking oil will give off white smoke. If you let the engine run at high speed, it will soon show signs. The wet sponge can block all kinds of harmful blue and black smoke in the sponge and let the exhaust pipe spray water. You can't let the cat out of the bag by stepping on the accelerator for a short time. It is the highest level of deception!
It's hard to see through this.
Do you see it? What can you see in the dark exhaust pipe? Can't do/work
Insert it and test it? Didn't the car dealer think of that? The sponge must be in the bend of the exhaust pipe, and the straight stick can't check it. also not line
Keep pumping oil so that the sponge can be blown out when the engine is working? Sponge is breathable, and gas will pass through it. You will also hear "Bug" refuse you on the grounds of "running out of gas" and "don't destroy the car like this if you don't buy it" But it's a little close. ...
If the sponge is heated, the water will evaporate slowly, and finally the sponge will be dried. What if the dry sponge is heated? Will split up and eventually become scum.
You might blow the gas pedal to get it out. The exhaust gas has a temperature, and the temperature in the exhaust pipe will gradually increase. You will know what will happen after the rise, right?
Of course, the last step in buying a car is a test drive. And the wet sponge will appear on the spot soon!
In the chapter of engine, we mentioned the cover-up tricks that car bugs may use: cooking oil and absorbent sponge to cover up the real performance of the engine. But if we set the vehicle on fire and drive around, the actual performance of the vehicle can be truly reflected immediately.
We use low gear and high speed to control the car. Turn the steering wheel as far as possible to the left and right, and listen for any abnormal movements. If there is a sound like "bang bang bang", it is mostly a loose frame of the steering ball cage system.
Try to see if the speed is strong, the gear is smooth, the brake lines are parallel after sudden braking, and the brake marks are deep and shallow.
If the rotating speed is weak, it may be that the throttle or fuel injection head needs to be cleaned, or the spark plug needs to be replaced because of excessive carbon deposition.
If the gear is difficult or rough, it is mostly because the pressure plate and plate of the clutch system are worn thin, or the viscosity of gear oil is reduced and needs to be replaced.
If the brake line is not straight, it means that the four tires are not on the same line, which can be solved by four-wheel alignment. If the brake is printed with a deep and shallow mark, it means that the braking force on the left and right sides is different. Look at the wear degree of the left and right brake pads and brake discs, and see if the brake cylinder leaks oil. If the brake feels soft, check whether the brake oil is too dirty and replace it.
After driving in this way, the water temperature will show normal or higher. The temperature in the exhaust pipe can reach the point where the water in the sponge evaporates and the sponge becomes powder and is discharged. You can tell at a glance whether you cheated or not.