Should the throttle of the car be cleaned?
What is the function of the throttle and why should it be cleaned?
Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. It is called the throat of an automobile engine, and it can also control the amount of air entering the engine. There are two kinds of throttles: traditional cable throttle and electronic throttle. The traditional engine throttle control mechanism works by pulling a cable or pull rod. One end of the cable or pull rod is connected with the accelerator pedal, and the other end is connected with the accelerator linkage plate. The electronic throttle mainly controls the opening of the throttle according to the air intake required by the engine through the throttle position sensor, so as to adjust the opening of the throttle.
When idling, the throttle opening is very small, which is one or two degrees! Controlling the stable idle speed is an accurate work, and the oil and dust on the accelerator working surface will lead to inaccurate control! The throttle will learn by itself. With the dirt of the throttle, the throttle angle will gradually increase! Dirty to a certain extent, the throttle can no longer be adjusted, and if the idle speed is too low, it will turn off! Some cars will turn on the fault lights!
We can also read the data stream and check the throttle opening.
Of course, no one wants to turn on the fault light to clean the throttle, so how can we judge whether the throttle is dirty enough to need cleaning when we use the car every day?
(1) The obvious characteristics of dirty throttle are slow throttle response, fleshy acceleration, unstable idle speed and idling jitter, which are basically directly felt by the owner himself!
(2) There is a simple trick to judge whether the throttle valve needs to be cleaned: whenever the engine of the EFI car is empty, it slams on the throttle for 3000 revolutions in neutral, and then suddenly collects oil. Pay attention to the tachometer pointer at this time!
1. When the pointer quickly drops to 1000 to 1200 rpm, the pointer will pause a little, then drop to about 800 rpm, and the idle speed will be stable. The throttle is completely normal at this time.
2. When the pointer quickly drops to about 800 rpm and stabilizes, the throttle valve is slightly dirty, but it still doesn't need cleaning, which is basically normal.
3. When the pointer quickly drops to below 800 rpm or even 700 rpm, and then slowly rises to around 800 rpm, and the idle speed follows from small to large, congratulations, the throttle has been seriously fouled and needs to be cleaned immediately.
Judgment principle: When the engine of EFI vehicle is empty, the ECU will automatically stop fuel injection by releasing the throttle when the fuel door is full. When the rotational speed drops to 1000~ 1200 rpm, the injection point will be restored (according to the parameters set by ECU), and then it will be gradually reduced to idle injection. Form a buffer to prevent flameout (this is the idle flameout prevention program set by ECU).
Maybe you'll think it's too complicated. No matter what, after washing, we are not short of money. But I must remind you of a few points:
1, if you don't agree with1-20,000 kilometers, wash the throttle indiscriminately. The more often you wash the accelerator, the more problems the car may have; The car is not getting better, only getting worse! Even when cleaning the throttle, the choice of cleaning agent (liquid) is particularly important. Do not use strong corrosive cleaner! But we must understand that even the best detergent can only reduce the damage to a very low level, and the damage is inevitable!
2, in the final analysis, in a word: if you can't clean the throttle, don't clean the throttle; Don't wash the throttle easily unless you have to! When using a car normally, the maintenance is generally 30,000 kilometers. You only need to clean the gas path once. There is no need to clean the throttle or oil circuit at all!
3. Develop correct driving habits and diligent maintenance, and do not add inferior gasoline. In this way, our throttle can definitely be 65,438+10,000 kilometers without cleaning! Enough!
We can use the mobile phone to check the condition of the car, judge whether to wash the throttle and the effect of cleaning the throttle. In fact, it was fine before cleaning, and the idle speed was unstable after cleaning, and the increase in fuel consumption was also common. It will take some time for the engine to return to normal. So if your car is in good condition, don't gild the lily to avoid overturning.