The best way to clean engine idle valve and cranks

2022-08-05
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Methods for cleaning engine idle valve and crankshaft exhaust pipe

the oil vapor of Fukang EFI engine flows out of the crankcase exhaust pipe, enters the air filter, and then enters the air inlet chamber. After combustion in the engine, the pollution of the atmospheric environment caused by the direct discharge of oil vapor can be reduced. When the engine oil vapor enters the air intake system, the temperature drops, and the engine oil vapor condenses when it is cold, causing pollution to the automobile air intake system, such as oil inlet of the air intake pressure sensor, dirty fuel pressure regulator, dirty idle rotary valve, dirty vacuum pipe, etc. This is a common and frequently occurring disease of FK EFI engine

some taxis re burn the engine oil steam and directly discharge it into the atmosphere. This kind of behavior of benefiting oneself at the expense of others is wrong. At the same time, this practice is also unfavorable to the internal circulation of the crankcase

the intake pressure sensor feeds oil, so that ECU cannot get the correct pressure data of the engine intake chamber, it cannot give the correct control action, and the engine does not work normally. The most obvious phenomenon is that it is easy to shut down during driving, and the idle speed is low and unstable. It costs 400 yuan to replace the imported pressure sensor

the idle speed rotary valve is dirty, causing unstable idle speed of the engine and easy to shut down

the fuel pressure regulator is dirty, which makes ECU unable to get the pressure difference between fuel and intake chamber, resulting in high fuel injection pressure. Excessive fuel supply leads to rich mixture, resulting in poor acceleration, high idle speed and instability

cleaning the engine idle valve, vacuum pipe, throttle valve and crankshaft exhaust pipe is a common maintenance for Fukang tu5jp/k and tu3jp/k EFI Engines. You can do it yourself. After doing this DIY job well, some common engine faults will not appear, and it can also enrich the level of car use. You may as well try it

I. idle valve cleaning

the idle valve is located at the rear of the engine. One end is connected to the air filter through a pipe and the other end is connected to the engine intake chamber. It is a stop valve controlled by a double coil and has four conduction positions with different fluxes. When it is turned on, the engine gets air intake directly from the air filter through the idle valve to keep the engine running at idle speed. Due to long-term use, it is inevitable that scale will be formed, resulting in blocked idle valve, unstable idle speed, or flameout during driving

it is recommended to clean once a quarter, which can be DIY. The methods are as follows:

1. When the engine is shut down and slightly cool, open the engine cover and support it. Prepare a tin of carburetor detergent, plastic labels and high-quality paper towels

2. The idle valve is at the rear of the engine. You should stand at the side of the right wheel, first unplug the drive line plug on the idle valve, and pay attention to the direction of the plug for correct recovery. Do not use brute force. Pry off the steel wire clip first and pull it out gently

3. Loosen the two socket head cap screws with a hexagon wrench, remove the idle valve, clean it with carburetor detergent, and remove the dirt inside with a clean paper towel. The plastic label can remove the dirt where fingers cannot go deep. If there is a leather tiger or compressed air source, the idle valve can be blown. After cleaning, shake the idle valve to feel whether its cylindrical valve body moves freely. If there is stuck phenomenon, it means that the valve body has not been cleaned. Inject cleaning agent into the valve body, shake it again and repeat it several times until it is cleaned

4. Keep clean in the reverse order of disassembly, install the idle valve, and properly plug the drive line plug on the idle valve. Start the engine and try

II. Cleaning vacuum pipe

there is a rubber pipe with a diameter of about 10mm from the engine intake chamber, which is connected to the fuel regulator and the intake pressure sensor through a tee. The intake pressure sensor is at the front right of the engine compartment. How to apply the universal testing machine in the automobile industry RLC, etc. use tu3jp/k engine. Before entering the pressure sensor, the vacuum pipe should pass through a small white translucent plastic pot. I think it is set to prevent the oil steam from polluting the pressure sensor. Do not skip it and directly connect the pressure sensor. However, the vacuum pipe of tuhrd5jp/k engine is directly connected to the pressure sensor, and there is no plastic pot for depositing oil. Therefore, the pressure sensor of tu5jp/k engine is more likely to be polluted by oil vapor

It is easy to wash 3.175mm steel balls by turning down the DIY top cleaning dynamic hanging and swinging mechanism. The method is as follows:

1. Pull out the vacuum tubes, hook a clean cloth strip of appropriate size with a 80cm long thin steel wire, pull it from the vacuum tube, and wipe off the engine oil. Be careful not to damage the rubber pipe or leave the fiber of the cloth in the pipe. You can use compressed air to blow

2. Clean the pressure sensor with carburetor cleaner and carefully wipe it with paper towel and small plastic label. The small white translucent plastic pot can also be removed and wiped with a paper towel to ensure that the two outlet pipes are unblocked

3. Check whether the connection between the fuel regulator and the vacuum pipe is polluted. Please wipe it carefully with a paper towel and a small plastic label

4. Keep clean according to the original connection method, and insert all vacuum pipes in place without air leakage

5. Start the engine and check whether the idle speed is stable. If it is unstable, the vacuum pipe of the pressure sensor is generally not plugged in properly, or there is air leakage or impassability. Don't be nervous. After flameout, check carefully and plug it in again

III. clean the throttle valve

due to long-term use, the throttle valve will also accumulate dirt, affecting the opening and closing of the throttle valve, causing the engine to not work normally. It is recommended that when cleaning the air filter, check whether there is dirt in the throttle cylinder. If there is dirt, clean it with carburetor cleaner

the method is (assuming that the air filter has been disassembled):

1. Loosen the fastening screws of the metal clips between the air filter and the throttle body with a slotted screwdriver to separate the air filter top cover from the throttle body

2. Keep the throttle valve closed, spray the carburetor cleaner around the valve, and then carefully wipe it with a paper towel and a small plastic label

3. Pull the throttle fan * back and forth by hand to see if the throttle is clean and can be opened and closed freely. Then connect the air filter with the throttle body, ensure the sealing, and tighten the screws of the metal clip

4. Precautions: do not unplug the throttle position sensor plug for automatic vehicles. It is on the throttle body. Otherwise, use an instrument to re initialize the accelerator pedal position; Be careful not to spray carburetor cleaner on the air filter sealing rubber ring of the throttle body, which will corrode the rubber ring and affect the sealing performance

the above cleaning of the throttle body belongs to partial cleaning. To complete cleaning, the throttle cable must be removed, the throttle body must be completely removed from the engine intake chamber, and cleaned with carburetor cleaning agent. It was quite troublesome. Recommended going to the maintenance station. Especially for the automatic gear, after the throttle body is removed, use a special instrument to initialize the accelerator pedal position. You can't do it yourself

IV. methods for cleaning crankcase exhaust pipe and filter

regularly clean crankcase exhaust pipe and filter every month, which can reduce the pollution of engine oil exhaust gas to throttle valve, pressure sensor vacuum pipe and gasoline pressure regulator vacuum pipe. This regular maintenance is very easy to DIY. I recommend you do it yourself. Specific * operation methods:

1. After the hot car is turned off, wait for the engine to cool down, open the engine cover and support it

2. Prepare paper towels of good quality and a can of "carburetor cleaner"

3. Stand beside the left front wheel on the left side of the engine room, hold the exhaust rubber pipe with your left hand, and be close to the air filter. Clench your right hand and strike the back of your left hand. The exhaust gas rubber pipe shall be disconnected from the air filter. Hold the exhaust gas rubber pipe with your left hand, otherwise the waste oil will flow out and drip into the engine room

4. Take out the waste gas filter, wash it with carburetor cleaner and put it on the cleaning paper towel

5. Use a paper towel to remove the engine oil from the plastic joint at the exhaust pipe end, and also remove the engine oil from the air filter joint

6. Put the waste gas filter into the plastic joint at the end of the waste gas pipe to make the waste gas pipe and the air filter fit well

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