Hyundai Yuxiang idle unstable black smoke, Hyundai Yuxiang refueling engine stuffy, car boring?

The combustion is not good, and there is a possibility of a lack of tanks.

1. Reasons. 1.The flammable mixture is too thick.

2.There is too much oil in the engine fuel. 3.

Poor piston ring or crankshaft oil seal sealing. 4.There is moisture in the fuel.

5.Bad spark plug 6The air filter is too dirty.

2. Fault diagnosis and elimination.

1.For the inspection and diagnosis of excessive concentration of combustible mixtures, the carburetor and air filter should be checked.

2.The blend does not compare with the blend of the oil, or the wrong grade of oil is used. If the oil mixture contains too much oil or the oil quality is poor, the oil of the flammable mixture cannot be completely burned, resulting in black smoke.

The above phenomenon can also occur in two-stroke engines with separate lubrication and oil pump misalignment and excessive oil supply. At this time, the oil pump should be checked and adjusted according to the regulations to ensure that the lubricating oil is supplied proportionally at different throttle openings.

3.Excessive wear or breakage in a four-stroke engine, as well as too much oil in the crankcase, can cause oil to string into the combustion chamber and cause excessive oil in the mixture. If the crankshaft oil seal of a two-stroke engine is broken, it will also cause the oil from the transmission to string into the crankcase and enter the combustion chamber with the mixture.

4.One of the reasons for the mixing of water in the fuel is that the fuel in the fuel tank itself contains water, so the fuel tank should be cleaned and the fuel should be replaced. Another reason is that the cylinder gasket of the water-cooled engine is broken, and cold water enters the cylinder.

If, in the absence of leakage, the water in the tank is consumed too quickly, and the exhaust smoke from the exhaust pipe is slightly white, this is mostly the reason and the head gasket should be replaced.

Black smoke from gasoline engines is rare, black smoke is mainly not completely burned fuel in the combustion chamber, in the case of high temperature and lack of oxygen, diesel can not be completely and fully combusted, so decomposition and aggregation to form soot, it is a small diameter of the aggregate.

Because this aggregate reacts much slower than gasified fuel, due to the high temperature and anoxic environment of the combustion chamber, it cannot be fully burned again and is discharged through the exhaust pipe, so black smoke is presented.

The direct consequence of this phenomenon is that the fuel consumption of diesel engines is very high, the power is reduced, and at the same time, a large amount of carbon deposits exist in the piston and piston ring valves. In severe cases, the piston rings will be jammed, the valve seal is not tight, and the air leakage will be accelerated, and at the same time, it will also accelerate the wear of parts, thereby reducing the service life of the engine, so this aspect should be paid special attention.

Oil spills. There are usually several reasons for oil leaks:

1. Valve oil leakage, valve oil leakage is generally because the valve is blocked or damaged, and the solution is to replace the valve.

2. The joint is loose, and the solution is to tighten the joint or replace the joint.

3. That is, you have problems with the pump and hydraulic oil pipe.

Summary. Hello, glad for your question. We're here to help you sort out the answers to your questions.

Please wait....Hello, glad for your question. We're here to help you sort out the answers to your questions. Please wait....If the accelerator pedal of the car is stuffy and the acceleration is weak, check whether the oil and coolant are sufficient, and add them according to the actual situation; Youbei checks the dirtiness of the air filter and cleans or replaces it; Go to the 4S shop to carry out the engine carbon deposition cleaning project; Regularly go to the 4S store to enter the hall for careful maintenance and respect; Finally, it is necessary to maintain good driving habits and avoid intense driving.

I just changed the head gasket.

It's getting boring and boring.

Has the throttle injector and three-way catalytic converter been cleaned?

It may be that there is a lack of cylinder, this is only a preliminary judgment, and it is best to go to the repair shop to check it.

1. If you have cleaned up the engine carbon deposit, washed the throttle, changed the oil cushion and spark plug, etc., and still found that the body shakes when idling, it is recommended to go to the store to check the fuel supply pressure and intake pressure sensor, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is poor, it will cause the body to shake.

Solution: Check the oil pressure and replace the parts if necessary.

2. Engine parts may be aging, such as the aging of engine feet, which may cause the body to shake. The engine foot is actually the shock absorption system of the engine, and the engine foot is responsible for absorbing the subtle shake of the engine when it is running, and if there is a problem with the engine foot, these vibrations will be transmitted to the steering wheel and cab.

Solution: Replace aging parts.

3. The engine throttle valve is too dirty or the fuel injector is too much carbon deposit, causing shaking. When there is too much carbon deposit, the gasoline sprayed by the cold start injector will be absorbed by the carbon deposit, resulting in the cold start mixture being too thin and difficult to start. The gasoline adsorbed on the carbon deposit of the car after the car is hit by the vacuum suction of the engine will be sucked into the cylinder for combustion, so that the mixture becomes thicker, and the combustible mixture of the engine is dilute and thick, resulting in idle shaking.

Solution: Clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned.

A non-negligible cause is "carbon deposition", which will cause insufficient combustion of gasoline and cause the engine to shake. The impact of engine carbon deposition on the car is quite large, first of all, to reduce the engine power, that is, to make the power output uneven and gradually decay, in other words, more and more powerless. The second is to increase fuel consumption and increase your financial burden.

The third is the difficulty of cold start, that is, the difficulty of ignition, it is not easy to get on the car, and finally the serious carbon deposition in the combustion chamber will also cause cylinder detonation, and there will be a sound of low-speed acceleration, which will cause damage to the piston and crankshaft, thereby seriously affecting the safety of the car. Then there is the excessive discharge, which not only fails the annual inspection and inspection, but also directly aggravates the harm of polluting the environment.

There is another reason: the throttle valve is faulty. Both of these problems can cause engine shake and unstable speed.

Clean the throttle and check the spark plug [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Idle jitter is a dirty throttle, just clean the throttle.

It may be caused by the problem of excessive carbon deposits in the engine.

It is recommended to check whether the throttle valve needs to be cleaned.

The causes of car idle jitter may be: faulty spark plug or ignition coil; Incorrect valve timing; uneven compression of the cylinder;

The valve seal is not tight, and there is air leakage; poor fuel pressure; Fuel injector plugging leakage; leakage between the cooling system and the cylinder; Air flow.

Sensor failure.

Classification of unstable idling.

1.How to observe unstable idling.

Observe the degree of shaking of the engine block, you can also ** the degree of shaking of the dipstick handle, and the smooth dipstick handle is very clear and shaking.

The dipstick handle looks double; Observed from the engine tachometer or reading data block, the rpm is jitter centered on the idle expected value, or.

Sharp shaking on the expected side, the expected idle speed in the program includes the standard idle value, load (light on, automatic transmission.

Hang the upper gear, etc.) idle value, air conditioning idle value, warm car idle value; Start the engine on the spot and feel the body violently while sitting in the seat.

Dithering. 2.Classified according to the law of appearance.

Cold car (coolant temperature below 50) rhythmic instability; Hot cars (coolant temperatures above 50) are rhythmically unstable.

Irregular, violent shaking.

One, two. 3. Classification according to the degree of jitter.

Normal, with the expected value of 10r min shaking at idle speed; Generally unstable, with an expected idle speed of 20r min jitter; Seriously not.

Stable, exceeding the expected idle speed by 20r min jitter; Shake violently on the side of the idle expectation.

4.Categorized by reason association.

The direct cause refers to the dirty, worn, incorrect installation of mechanical parts, etc., which leads to the change of individual cylinder power, resulting in each.

The power of the cylinder is unbalanced, resulting in unstable idle speed of the engine; Indirect causes refer to the abnormal electronic control system of the engine, resulting in mixing.

Poor combustion of the combined gas makes it difficult to balance the power of each cylinder, resulting in unstable engine idling.

5.Classified by faulty system.

air intake system; ignition system; Motor.

Hello, this is caused by the failure of the three-way catalytic converter, or the insufficient combustion of the engine

Hello friends, it is recommended to check the air intake system for air leakage, which causes the oxygen content to be too high.

Hello this underneath the exhaust gas. The temperature is high. It's been a long time. It's normal to turn red.

Insufficient air intake The air flow meter is faulty.

Reasons why the car idles at high speed when starting:

1) It is normal for the idle speed to be high when starting. Cars need high speeds to get the engine to reach normal working conditions as soon as possible, and they need a thicker mixture, so the air intake and fuel injection will increase, resulting in high speeds.

2) High rotational speed is generally the cause of excessive carbon deposit. Timely cleaning of the throttle and idle motor can usually solve the problem.

Reasons for high car idling:

1. The idle switch is not closed.

2. The idle control valve is faulty.

3. Air intake pipe leakage.

4. The gas distribution phase is wrong.

5. The injector is dripping or clogged.

6. The exhaust system is blocked.

7. The EGR valve is opened when idling.

The engine does not work at idle, shakes, and is accompanied by the "abrupt" sound of the exhaust pipe, and even shows signs of stalling, because the specific model is not specified, and the possible reasons for the comprehensive existence are as follows (under the condition of multiple emission standards):

1. Oil pipeline.

a. Oil circuit blockage, poor patency, rail pressure, etc.

b. Abnormal electric fuel pump or fuel filter blockage and obstruction of transportation due to various reasons;

c. Abnormal fuel injector: the quality failure itself, or the blockage, poor sealing, aging of the rubber ring and other defects caused by foreign bodies can be caused.