When the Frontier S starts, the engine has a clattering sound, and it disappears after about a minut

If the engine is faulty, no matter whether the cold car is hot or the car will sound, only when the cold start, it may be just caused by low temperature, abnormal part clearance or poor lubrication, and there is also the sound of the starting motor bearing, which is generally not a big problem. However, if you suspect that there is a problem, you can go to the after-sales service or repair the motorcycle and let the repairer listen.

As mentioned above, this sound may be the sound of the starting motor, or it may be beyond the clutch (the overtaking clutch is used when starting electrically, which is different from the clutch), and it should have nothing to do with the clutch, gear, cylinder barrel, piston, etc. If it's especially noticeable in cold weather, it's more likely to be from the starter motor.

Try a different starter motor, and it won't have any other problems.

It is difficult to judge if the sound problem is not heard, but even when the cylinder piston is just started at a low temperature, it generally does not make the sound of rubbing the iron. The cold start should be preheated with the damper and throttle, so that it is easy to stall. There is a sound when it first starts, generally it is the sound of the valve system, beyond the clutch, etc., any part of the engine is damaged, it may cause sound, it is recommended to go to the place where the car is repaired, and let the car repairer listen when there is a sound when the cold car starts, so that it is easy to judge.

The reason for this phenomenon is that the valve sounds, and the oil pressure of the hydraulic tappet is insufficient when the cold car starts, which causes the start to ring for a while, and after a few minutes, the oil pressure is normal and the sound is eliminated.

Most of them are caused by the lack of friction of the engine belt, which is especially noticeable in winter

This sound may be caused by the valve feet, valve guides, and hydraulic ejector rods, but there are many reasons for this sound, such as lack of oil, low oil pressure, or friction between the valve and the guide and hydraulic tappet. For this kind of problem, if there is no other feeling, you can use it like this first, if you deal with it, you also need to disassemble the cylinder head, and the actual significance is not very large, it is recommended that you start from the oil aspect, you can choose SN grade 5W-30 fully synthetic engine oil like Mobil 1, and check the oil pressure.

It should be preheated by the cold machine, and it is no big deal.

What happened to the sound of Hyundai's leading engine? The reasons for the abnormal noise of Hyundai's leading engine are as follows:1

A common cause of a car's tremor and vibration is that the throttle is too dirty or the grease nipple has too much carbon. It is necessary to remove carbon deposits from the engine, clean the throttle, replace the oil pad and spark plug, etc. before standing. 2.

If you still find imitation clear shaking and abnormal noise after cleaning, it is recommended to go to the 4S shop to check whether the oil supply pressure and inlet pressure sensors are normal. If the oil pump supply pressure is abnormal or the intake pressure sensor value is incorrect, it will basically cause the body to tremble if it does not work well; Xiaoshan 3Abnormal sound caused by aging or loose machine mats.

The pad is mostly installed between the engine and the body, connecting the body and the engine, and playing the role of fixing the engine. And its most important function is to play the role of cushioning and shock absorption. Once the machine's gasket is aged or loose, the engine will shake violently, resulting in abnormal noises.

Replace the foot pad to solve the problem; 4.The abnormal sound of "clanging" is likely to be a cylinder knocking phenomenon. Most of them are due to poor lubrication conditions, excessive wear of the piston and cylinder wall, which affects the collision of the piston skirt and cylinder wall when the engine is running.

If the oil doesn't match, just change the oil.

**Reasons for abnormal noise in the leading engine: 1. If the engine makes a puff and puff noise, it means that the engine valve has too much carbon deposit, and the valve is blocked, and the valve of the engine can be cleaned; 2. If there is a squeaky noise, it means that the engine belt is loose, adjust the engine belt, if the belt is not elastic, replace it with a new one, so that there will be no abnormal sound; 3. If it is a clanging sound, it means that the screws that stabilize the engine are loose, and the screws can be tightened; 4. The abnormal sound of clanging may also be due to the aging of the claw pad, which is also a part of the stable engine, and the claw pad engine should be replaced so that there will be no abnormal sound.

The reasons for the abnormal noise of Hyundai's leading engine are as follows:1The most common cause of abnormal vibration in the car is that the throttle is too dirty or the grease nozzle has too much carbon.

It is necessary to clean the engine carbon deposits, clean the throttle valves, replace the oil pads and spark plugs, etc. 2.If there is still abnormal vibration after cleaning, it is recommended to go to the 4S shop to check whether the oil supply pressure and inlet pressure sensor are normal.

If the oil supply pressure of the oil pump is abnormal, or the numerical error and poor operation of the intake pressure sensor will cause the body to shake; 3.Abnormal sound caused by aging or loose machine mats. The machine mat is generally installed between the engine and the body, connecting the body burner and the engine, and playing the role of fixing the engine.

And its most important function is to play the role of cushioning and shock absorption. Once the lining pad is aged or loose, the vibration of the engine will be very violent, resulting in abnormal noise. Replace the foot pad to solve the problem; 4.

The abnormal sound of "jingle bell" is likely to be a cylinder knocking phenomenon. Generally, due to poor lubrication conditions, excessive wear of the piston and cylinder wall, the piston skirt collides with the cylinder wall when the engine is running. If the oil doesn't match, change the oil.

The car that Beijing Hyundai Lingdong took on September 10 was shocked by the engine in less than two months. And the sound is also loud, and the start is slow!

There may be the following:The oil is too viscous.

Whether the transmission belt is loose.

To see if the water temperature gauge is normal.

Maybe it's time to clean the throttle, intake tract, and fuel injector of your car.

The vehicle's seals should be inspected to see if there is any signs of aging.

The engine is one of the most important assemblies of automobiles and construction machinery, and it is the most powerful of power.

Due to the complex structure of the engine and poor working conditions, the failure rate is the highest, and it often becomes the focus of diagnosis and detection.

The changes in the technical condition of the engine are mainly manifested in the increase in failures, deterioration of performance and increased losses.

The main parameters used to evaluate the technical condition of the engine include power output, fuel consumption, oil consumption, cylinder pressure, oil pressure, engine temperature, abnormal noise and vibration, etc.

In general, the higher the speed, the stronger the mechanical noise.

The sound is not easy to discern. Therefore, the diagnostic speed is not necessarily high-speed, and it should be treated on a case-by-case basis.

For example, when auscultating valve sounds and piston knocks, they can be heard very clearly at idle speed or at low speed.

When the main bearing, connecting rod bearing and piston pin are more severe, they can also be heard at idle and low speeds.

In general, the diagnosis of abnormal response is performed at the speed at which the sound is most pronounced, and at the lowest speed possible.