Why is it difficult to start the engine when the cylinder pressure of the automobile engine is insuf

The piston in the engine cylinder is propelled by the pressure generated by the combustion of the air-fuel mixture, which rotates the crankshaft. The lack of pressure inside the cylinder means that there is less force to push the piston, and starting is of course difficult. In the case of a diesel engine, it does not have a spark plug, and the diesel is all compression-ignited, and the diesel will not burn at all if the cylinder pressure is insufficient.

In order for the mixture to combust, two conditions must be met, 1Plenty of oxygen. 2.

The right temperature. The piston compresses the mixture upwards, and the temperature of the mixture is to be raised. When the cylinder pressure is insufficient, because there is not enough mixture, although the piston reaches the top dead center, the temperature of the mixture still cannot reach the required temperature, and the heat of the spark plug (gasoline vehicle) cannot ignite the mixture, and the same is true for diesel vehicles, and the mixture will not be compressed if the temperature is not reached.

Insufficient cylinder pressure means air leakage, that is, the piston runs for a cycle to reduce the inhaled mixture, (diesel engine means less oxygen inhaled) The decrease in the mixture means that the combustion power is reduced, which is not enough to support the compression power of the next cycle, so it is difficult to start, and the diesel engine is difficult to start because of the reduction of oxygen and the reduction of compressed internal energy, when it is not enough to meet the combustion conditions.

Under high pressure, it can make the object naturally not to mention oil, and it is naturally difficult to take a taxi due to serious wear and pressure.

1.When the spark plug is started by moisture, if the choke is closed for too long, the gasoline in the cylinder will be too much and the spark plug will be damp. The treatment method is to open the choke door, unscrew the spark plug, open the spark plug hole, turn the engine, drain the gasoline in the cylinder, and then reinstall the spark plug, and then start the engine as usual.

2.If you find a lot of gasoline sticking around the spark plug when you remove it, the air filter may be severely clogged in addition to the reason why the choke is not open. At this time, the filter element of the air filter should be removed for cleaning, and the filter element should be replaced with a new part if it is rotten due to moisture.

3.Turn the engine with a leaking gasket, and carefully check the gasket between the cylinder head and the cylinder block for gasoline smell or hail leaks, if so, the cylinder gasket is leaking. The 4 compression nuts on the cylinder head should be checked first for looseness, and if they are loose, they should be tightened diagonally.

If there is still air leakage after tightening, the cylinder head should be removed, and the cylinder gasket should be checked for damage, and if it has been damaged, it should be replaced with a new part. If the air leakage is serious, check whether the cylinder head is damaged or deformed, and replace it if so.

4.Spark plug gasket leakage, spark plug gasket damage, or foreign matter on its surface, or forgetting to install spark plug gasket, will cause spark plug hole leakage. During diagnosis, you can turn the engine and carefully observe the spark plug around the starting source, if there is a gasoline smell or the sound of air jetting outward, it means that the spark plug seal is leaking.

At this time, the spark plug should be removed, check whether the spark plug pad is damaged, whether it is clean and reliable, and clean or replace it according to the situation. 5.If the cylinder pressure is too low, remove the spark plug, plug the spark plug hole with your fingers, and then turn the engine, your fingers feel that there is a very sharp air flow rushing outward, and at the same time make a sound of "poof, poof", which means that the cylinder pressure is good; Otherwise, the cylinder pressure is insufficient.

At this time, the cylinder block should be removed, and the inner diameter dial gauge should be used to measure whether the diameter of the cylinder body exceeds the service limit. If it is not exceeded, the piston rings and piston should be replaced; If the service limit is exceeded, the cylinder block should be replaced.

When the cylinder pressure is not enough, the gas pressure in the cylinder is not enough when the gas mixture is compressed, and the first force generated by gas combustion after ignition is not enough, which affects the insufficient engine shaking power.

The car always breaks down after a long time, and the best cars will have big and small shortcomings. The low cylinder pressure is caused by a large side clearance of the piston ring, an excessive gap at the open end, or a change in the mounting position of the air ring opening, resulting in a poor sealing of the cylinder. The piston and cylinder wear are excessive, resulting in an increase in the cylinder clearance, and the piston moves in the cylinder, meshing well with the cylinder and unable to seal.

The piston ring is stuck in the piston ring groove due to the accumulation of adhesive and carbon, and the ring cannot exert its own elasticity, and the first sealing surface of the air ring and cylinder wall is lost. An inconsistent piston was installed. In some starters, the concavity at the top of the selected piston is different, which can affect the cylinder pressure if used incorrectly.

The valve seal is not tight.

The reason why the cylinder pressure is too low - to solve the first thing to check the tightness of the valve and valve seat, if necessary, you can polish or replace it with a new one. Check piston ring openings and wear and adjust or replace piston rings if necessary. Measure the wear of the cylinder liner and replace the cylinder liner if necessary.

Please check if the valve spring is broken and if the spring has dropped too much. Check the cylinder head liner for leaks and replace it if necessary.

The reason why the cylinder pressure is too low is that the cylinder acts as a cylindrical metal part that guides the piston to reciprocate in a straight line in the cylinder. The air converts heat into mechanical energy through expansion in the engine's cylinders. The gas is compressed by the piston in the compressor cylinder, increasing the pressure.

Enclosures such as turbines, rotary piston engines, etc., are often referred to as "cylinders". Automatic control of robots, etc. In every part of the car, we should know the solution after the problem has occurred.

This is very helpful for us, and there are small problems that we need to learn to solve on our own.

If the bond is not good or there is wear, the air tightness is not strong, which may lead to insufficient cylinder pressure. Cylinder head gasket seals are not good. If your car isn't repaired, you don't have to worry about it.

That's a very fragile situation after the engine has been repaired. The valve tappet is deformed, if our engine is used for too long and starts cold, it must not be used as a train, and the oil combustion phenomenon will occur in the car for 100,000 kilometers, and the pressure in the cylinder may be insufficient.

The valve is faulty. Valve cone ablation, valve bending or breakage, and improper clearance adjustment will all lead to poor cylinder sealing and insufficient cylinder pressure; Resulting in a lack of stress. After long-term use of the car, abnormal maintenance will lead to the burning of the piston head and insufficient cylinder pressure, which will not occur under the normal maintenance of the car; The reason for the cylinder head gasket.

The cylinder head and the cylinder block are connected by the cylinder gasket, if the cylinder gasket is burned through or damaged, it will cause air leakage between the cylinders; The cylinder head causes insufficient cylinder pressure. The cylinder head of the automobile is deformed due to the high water temperature and loses its flatness, resulting in poor cylinder sealing. Piston ring failure.

1. The valve is faulty. Valve cone ablation, valve bending or breakage, and improper clearance adjustment will lead to poor cylinder sealing and insufficient cylinder pressure; 2. The piston causes insufficient pressure. After the car is used for a long time, there is abnormal maintenance, which will lead to the melting of the piston head and the insufficient cylinder pressure, which will not occur under the normal maintenance of the car; 3. The reason for the cylinder head gasket.

The cylinder head and the cylinder block are connected by a cylinder head gasket, which can cause blow-bys between cylinders if the cylinder head is burned through or damaged.

1. The side clearance and open end clearance of the piston ring are too large, or the installation position of the air ring opening is changed, resulting in poor sealing of the cylinder.

2. The piston and the cylinder are worn out too much, and the gap between the cylinder increases, and the piston moves and sways in the cylinder, which cannot form a good fit and seal with the cylinder.

3. The piston ring is stuck in the piston ring groove due to guming and carbon deposit, so that the elasticity of the ring cannot be exerted, and the first sealing surface of the air ring and the cylinder wall is lost.

4. The cylinder gasket is broken, the valve seat insert is loose, the valve spring is broken or the elastic force is insufficient, and the valve and valve guide are blocked due to carbon deposit or too small clearance, which hinders the up and down movement of the valve, resulting in poor valve sealing.

1. The valve is faulty. Valve cone ablation, valve bending or breakage, and improper clearance adjustment will lead to poor cylinder sealing and insufficient cylinder pressure;

2. The piston causes insufficient pressure. After the car is used for a long time, there is abnormal maintenance, which will lead to the melting of the piston head and the insufficient cylinder pressure, which will not occur under the normal maintenance of the car;

3. The reason for the cylinder head gasket. The cylinder head and the cylinder block are connected by a cylinder head gasket, which can cause blow-bys between cylinders if the cylinder head is burned through or damaged.

4. The cylinder head causes insufficient cylinder pressure. Due to the high water temperature, the cylinder head of the car is deformed and loses its flatness, resulting in poor cylinder sealing. Piston ring failure.

If the piston ring is subjected to high temperature for a long time, the piston ring will be elastic and insufficient, which will not seal the piston well, and will also lead to insufficient cylinder pressure. The cylinder bore is worn. Improper maintenance of the car, failure to replace the air filter in time or poor environment will lead to wear of the cylinder inner wall, and the piston and the cylinder wall can not form a good seal, resulting in insufficient cylinder pressure.

Thank you, hope it helps

The main factors for low cylinder pressure are the amount of carbon deposits in the combustion chamber, and whether the sealing condition of the combustion chamber and the smooth exhaust gas. Cylinder pressure refers to the amount of cylinder shrinkage pressure when the piston reaches the top dead center of compression. Insufficient cylinder pressure means that the cylinder tightness is reduced, which will reduce the engine power and make it difficult to start.

We hope you find it helpful

The reasons for the insufficient pressure of the engine air cylinder are as follows: early infiltration 1, air leakage between the cylinder head and the cylinder: step on the rotation of the engine, carefully inspect the joint surface of the cylinder head and the cylinder for oil foam, if there is oil foam, it means that the cylinder head gasket is leaking, and the bucket should check whether the compression nut on the cylinder head is tightened; 2. Air leakage caused by serious wear of piston rings and cylinders or jamming of piston rings; 3. If the spark plug gasket is damaged or there are impurities on the surface, forget to install the spark plug gasket, which can make the spark plug gasket leak between the spark plug gasket and the cylinder head.

The low compression pressure of the engine cylinder will make it difficult to start the engine, the car will be weak, and the fuel consumption will increase, so it should be eliminated in time. The methods are: 1. First, check the tightness of the valve and valve seat, and grind or replace the new product when it is needed; 2. Check the opening and wear of the piston ring, adjust the trace or replace the piston ring if necessary; 3. Measure the wear of the cylinder liner and replace the cylinder liner if necessary; 4. Check whether the valve spring is broken and whether the elastic force has dropped too much; 5. Check whether the cylinder head gasket is leaking, and replace it if necessary;

Summary. Hello, there are several reasons for insufficient cylinder pressure, the first is the problem caused by valve leakage, and the second is that the cylinder gasket is flushed out, causing the series cylinder and causing the cylinder pressure to be too low. This needs to be disassembled and the cylinder head is taken a look.

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

Hello, there are several reasons for insufficient cylinder pressure, the first is the problem caused by valve leakage, and the second is that the cylinder gasket is flushed out, causing the cylinder string, resulting in the cylinder pressure is too low and high. This needs to be dismantled and carefully untied to see the leakage.

The main thing is that the two-cylinder is not.

Mainly in the case of the second cylinder, it may be that the problem is caused by the oxidation of the two-cylinder valve.

The second cylinder is insufficient. This is likely to be caused by the oxidation of the two-cylinder valve, or the problem caused by the poor sealing of the two-cylinder piston ring, which needs to be disassembled and inspected.

How to fix it. Lack of uphill power.

Only the second cylinder lacks the cylinder key to prepare, how to solve it, this only to remove the cylinder head, and then look at the situation of the second post, whether the valve is damaged or the piston ring seal is not good, the problem is caused.

If you are in a state of constant lack of cylinders, it will definitely lead to a lack of uphill strength.

Mainly oil and gas support.

In the case of oil and gas dual-purpose vehicles, it is more troublesome to investigate.

The reasons for the insufficient engine pressure are as follows:1Air leakage between the cylinder head and the cylinder:

After stepping on the engine, it is necessary to carefully check whether the cylinder head meets the cylinder surface for organic oil foam. If organic oil foam is found, the cylinder head gasket is leaking. At this point, you need to check whether the hold-down nut on the cylinder head is tightened.

2.The piston rings and cylinders are severely worn or the piston rings are stuck, resulting in air leakage; 3.If the spark plug gasket is damaged or there are impurities sticking to the surface, forgetting to install the Zheng Hong spark plug gasket will cause air leakage between the spark plug gasket and the cylinder head.