How to judge whether to clean the throttle?

How to judge whether your car needs to clean the throttle? The simple method is: start the car, put it in neutral, slam the accelerator to about 3000 rpm at normal water temperature, quickly release the accelerator and pay attention to the pointer of the tachometer. When the throttle is released, the speed pointer will quickly drop to the low speed direction. If the accelerator is not dirty, when it drops to about 1000- 1200 rpm, the pointer will pause (just like a car suddenly stepping on the brake pedal while driving), and then continue to drop to about 750-800 rpm. If there is no such pause process at 1000- 1200 rpm, it is time to wash the throttle. The general principle is that when the engine is empty, the fuel injection will stop automatically when the throttle is released behind the fuel filler door. When the rotational speed drops to 1000- 1200 rpm, the computer controls the fuel injection to resume, forming a buffer zone without flameout, and then gradually decreases to idle injection.

First of all, I emphasize that because there are not many photos taken at work, I later borrowed the photos in Xiaohao's post to express my gratitude to him. I have read all the posts about cleaning the throttle, and I feel that many places are unclear and many terms are not accurate. This post is hereby issued.

I have always been dissatisfied with the shaking of my cold car. It is inferred that the main reasons are throttle carbon deposition and intake valve carbon deposition. I witnessed the carbon deposit on the intake valve in 4s, and I think there must be carbon deposit on the throttle valve.

Why do I clean myself: always pay attention to the maintenance of bad mules. After all, cars cost a lot of money, so we must cherish them. In addition, because the quality of domestic oil is relatively poor, we suggest that you add oil strictly according to the label of broken mule, instead of low-grade oil. Generally 1W axiom is enough to wash it once. As for cleaning the accelerator, if it is for 4S, they will only wash one side (not completely), will not disassemble it, and will not act cautiously. Charge 80~ 150 once.

After last week's preparation, I bought a set of powerful 46-piece tools at Taobao Flower 160, and bought a bottle of carburetor cleaner for 5 yuan, and printed a set of online operation strategies. All these preparations are ready, so I'm in a hurry. I can't wait to start working at once. I'm just a child in a hurry. After eating at noon yesterday, I rushed to the unit, found a mask, a carp pliers, some rags and a pack of absorbent cotton swabs, and began to work.