What s the deal with the crisp clatter of the engine at idle?

Engine idle crisp clatter sound fault causes: the piston and cylinder wall clearance is too large, the oil pressure is too low, and the cylinder wall lubrication is poor.

1. Control the engine speed in the most obvious range, check whether the oil filling port is smoking, whether the exhaust pipe is emitting blue smoke, use the stethoscope to auscultate on the upper side of the body, you can also use the screw screw to resist the side of the cylinder block, stick the ear on the wooden handle of the screw screw, listen to whether the vibration knocking sound, if the above symptoms appear, it can be diagnosed as piston knocking cylinder.

2. Cylinder-by-cylinder fire test, if the sound of a cylinder is weakened or disappears after the fire is broken, the sound increases significantly when the fire is refired, and then the original sound is restored after one or two sounds, and the sound weakens or disappears after the engine temperature rises, it can be diagnosed as piston knocking the cylinder.

3. Add oil test method to remove the spark plug of the cylinder to be checked, inject a small amount of oil, and then start the test again, if the sound disappears or is obviously weakened, but soon comes back, it can be diagnosed as the cylinder piston knocking the cylinder.

Here's how to fix it:

1. The oil pressure is too low, because when idling, the oil can not be well lubricated to the valve and valve riser at the top of the engine, resulting in the valve is not fully lubricated and makes a clicking sound.

2. Because there will be a little exhaust gas in the fuel tank to be re-discharged to the combustion chamber for combustion, then in the process it will pass through the parts of a carbon canister solenoid valve, so there will be a clicking sound, if the part is aged or damaged, it can be replaced;

3. Piston knocking cylinder, you can try to break the fire of the cylinder one by one, if the sound is weakened or disappeared after the fire is broken, and then the sound is restored again, the sound disappears or weakens after the hot car can prove that the piston knocks the cylinder, at this time it is not possible for us to solve it ourselves, you can go to a professional repair shop or 4S shop for processing.

Here's why:

1. Valve sound.

When the valve clearance is too large, or when the amount of oil on the cylinder head is small due to lack of oil, there will be a clicking sound!

First of all, check the oil level, whether there is a lack of oil! Look at whether the oil alarm light is on or not, that is, whether the oil pressure is normal! If it's all right, see if the valve clearance is too large, if it's a hydraulic tappet car, is there a problem with the hydraulic tappet!

2. Knock on the cylinder or the chain is abnormal!

Knocking on the cylinder generally does not appear for no reason, most of it is caused by excessive carbon deposits, if it is a mechanical knock, it means that the engine may be flooded, resulting in bending of the connecting rod or other accidents!

Not to mention the abnormal sound of the chain, the chain may be elongated or the tensioner may be damaged!

3. The crankshaft cam bearing gap is too large!

Generally, if this fault occurs, first of all, the oil lamp will turn on, the engine will shake, and the sound will become louder when you step on the accelerator!

This is generally caused by low oil pressure, and it is likely that the engine will have to be overhauled, and the oil pump will be checked!

4. Abnormal sound of gearbox!

Abnormal idle speed does not rule out abnormal transmission noise, when the gears of the transmission are damaged or the bearings are broken, there will also be a clicking sound!

5. Engine belt drive system failure!

For example, if the water pump or tensioner fails, it will clatter! This should be analyzed on a case-by-case basis!

There is a clattering sound in the engine, which may be caused by the following reasons:

1. Abnormal noise of engine belts, such as generator belts, air conditioning belts, steering pump belts, etc., may be too loose or too tight, or it may be that the belt is aging, adjust the tightness of the belt, apply butter to the belt, or replace the belt.

2. The engine lacks cylinders, a cylinder does not work, the engine will be unbalanced and produce abnormal noise, and it is also accompanied by the violent shaking of the engine, insufficient power and other faults, which may be the fault of the ignition module, spark plug and fuel injector, and the corresponding accessories can be replaced.

3. Engine "tempering" failure. When the car slows down and collects the oil, there is a "poof" sound, which may be the engine "tempering" failure, which is usually called the engine "fire", too much carbon deposition on the valve or the wrong timing of the valve will produce abnormal noise, cleaning the carbon deposit on the valve or adjusting the timing of the valve.

Summary. There is this sound when idling, sometimes it doesn't, sometimes it appears, this is mainly the canister solenoid valve on the engine, which will make this sound when working. This is not from the engine, this is mainly the carbon canister solenoid valve on the engine.

Sometimes work sometimes doesn't work, this thing is automatically controlled by the computer, there will be this kind of sound, this is normal, there is no problem, normal use can be.

There is a clattering sound at the engine idling, sometimes there is no such thing.

Dear, this question is up to me, it takes a little time to type, please be patient, thank you!

Hello, I'm helping you sort out the answer to your question, please wait a while There is this kind of sound when idling, sometimes no, sometimes it will appear, this is mainly the carbon canister solenoid valve on the engine, which will make this sound when working. This is not from the engine, this is mainly the carbon canister solenoid valve on the engine. Sometimes work sometimes doesn't work, this thing is automatically controlled by the computer, there will be this kind of sound, this is normal, there is no problem, normal use can be.

The possible causes of engine idling are too large a gap between the piston and the cylinder wall, too low oil pressure, and poor lubrication of the cylinder wall.

The specific method of eliminating abnormal engine idle speed is to assist auscultation in the middle and upper part of the body

1.Control the engine speed to the range where the abnormal noise is most obvious, and check whether there is smoke from the fuel filler and blue smoke from the exhaust pipe. Use a stethoscope to auscultate on the upper side of the body or place your ear on the wooden handle of a screwdriver to hear for vibrations and knocks.

If the above symptoms are present, the diagnosis can be made of piston knocking.

2.Add the oil test method, remove the spark plug of the cylinder to be checked, inject a small amount of oil, and start the test again. If the sound disappears or decreases significantly, but soon returns, the diagnosis is piston knocking.

3.Cylinder-by-cylinder misfire test. If the cylinder sound decreases or disappears after a fire, the sound increases significantly once or twice and then returns to its original sound. When the engine temperature rises, the sound decreases or disappears, which can be diagnosed as piston knocking.

When the engine is idling, the solenoid valve installed between the intake manifold and the carbon canister is opened, and it will also be closed, so there will be an intermittent switch action, so that the engine will make a crisp clicking sound when idling.

When the engine is turned off, the activated carbon tank in the solenoid valve of the carbon tank will adsorb the gasoline vapor volatilized by the fuel tank in the activated carbon hole in the carbon canister, which can effectively prevent the gasoline vapor from volatilizing into the atmosphere. The function of the solenoid valve of the canister is to open the solenoid valve when the engine is idling, so that the internal gasoline vapor and the external fresh air are sucked into the cylinder together, so as to achieve the effect of reducing emissions, so it is widely used in automobiles.

When the canister solenoid valve fails, the engine will be unstable when idling, and there will be a lack of power when accelerating. The most common thing is that the filter of the air inlet of the carbon canister is blocked, at this time, you only need to go to the 4S store to replace it, ** is not expensive, dozens of dollars can be done.

Reason: 1. When the car starts cold, the sound of the engine will be slightly louder than that of the hot car, as long as the sound sounds uniform and soft, not harsh, there is generally no problem. This is due to the fact that the gap between the cylinder wall and the piston is not yet optimally sized during cold driving, and the lubrication of the oil is not sufficient.

Usually as long as the temperature of the engine block reaches about 95 degrees, the sound will return to normal.

2. The reason for the oil. Inferior engine oil or not changing the engine oil for a long time, lack of engine oil, etc., can easily lead to increased friction between the valve and the duct and the hydraulic tappet, etc., so that the various sounds in the engine are louder. Therefore, you need to go to a regular gas station to refuel.

Mine is the same as yours, whether it is a hot car or a cold car idling sound, the 4S shop said that the timing of the belt is normal, it is really annoying, 16 self-comfort.