BMW 13 740 luxury idle jitter is what is the problem

The most fundamental reason for the shaking phenomenon of unstable car idling is poor combustion in the cylinder. If the combustion is not good, the power provided by the car will not be enough, and the car will shake.

Throttle oil and throttle carbon deposits, dirty intakes, blocked intakes can cause idle pulling, throttle carbon deposits or oil are the most common causes of unstable idling.

Spark Plug Failure: Weak sparks caused by individual spark plug failures can also cause carbon deposits, which can be cleaned to restore spark plug activity, but some spark plugs have a fast lifespan and can reduce performance.

Blocked oil circuits: There are also oil circuit blockages and intake pipe failures represented by fuel injectors. When the oil circuit represented by the injector is blocked, the fuel supply pressure is insufficient, the fuel atomization is poor, the mixing ratio is unbalanced, and the combustion is incomplete, which leads to related failures.

Specific solutions to idle jitter:

1. The engine has serious carbon deposits. The most common cause of idle judder is excessive carbon build-up on the throttle or injector. When there is too much carbon deposit inside the engine, the gasoline sprayed by the fuel injector during cold start will be absorbed by the carbon deposit, resulting in a mixture that is too thin and making it difficult to start.

After landing, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine and burned, which will thicken the mixture. The mixture is sometimes dilute and sometimes thick, which will cause idle jitter after cold start. The lower the temperature, the greater the amount of oil required for cold starts, and the more the presence of carbon deposits affects cold starts.

The solution is to clean the carbon deposits at the throttle and injector.

2. Poor ignition system and poor ignition of spark plugs will also lead to engine idling and shaking. If there is a problem, check if the ignition system is faulty and if there is too much carbon deposited in the spark plug.

3. The oil pressure is unstable. If you have cleaned the engine carbon deposits, cleaned the throttle valve or replaced the spark plug, and there is still the problem of body shaking when idling, it is recommended to go to the 4S shop to check whether the fuel supply pressure and intake pressure sensor are normal. If the oil pump supply pressure is not normal or the intake pressure sensor is incorrect, it can also cause the body to shake when idling.

Solution; The best way is to clean the oil circuit, clean it regularly, there is no specific experience in the research and development parameters of the clean engine from the new car, coupled with the continuous improvement of emission standards, can not adapt to the change of fuel, all manufacturers of the engine are unable to solve this jitter problem in the short term, plus the fuel quality is not very good or the initial fuel of the new car factory is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage. The occurrence of excessive carbon deposits is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits. The use of PNF dope fuel additives can solve the problems caused by carbon deposition.

There are several causes of idle jitter:

1.The engine has a lot of carbon deposits.

The most common cause of car shake is a dirty throttle or excessive carbon build-up in the fuel injector. When the carbon deposition inside the engine is excessive, the gasoline sprayed by the cold start fuel injector will be absorbed by the carbon deposition in large quantities, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by carbon deposition is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposition after the car will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, causing idle shaking after cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon deposits will affect the smooth cold start.

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

2.Problems with the ignition system.

Check the working condition of the spark plug, high-voltage wire and ignition coil, the ignition system is not working well, and the spark plug tripping condition is not good, which will also lead to this kind of failure.

Solution: Check whether the spark plug has too much carbon deposit, and replace the spark plug.

3.The oil pressure is unstable.

If you have cleaned the engine carbon deposit, washed the throttle, changed the oil pad and spark plug, etc., and still found that the body shakes when idling, it is recommended that you go to the 4S shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is not good, the body shake will be triggered.

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

4. Aging of engine parts.

Car jitter is also related to the aging of the engine feet (also known as claw pads). The engine foot is actually the suspension 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, causing shaking when idling.

Workaround: Replace the parts.

The steering wheel of the car shakes, this situation is very common, some car owners can feel a strong steering wheel shake when driving the car at high speeds, when the speed reaches 80-100km h or more. In this case, most of the problems occur in the tires of the car, because the uneven distribution of the mass of the whole part of the tire will cause the wheels to rotate at high speed, and there will be a dynamic imbalance state, which will cause the steering wheel of the car to shake seriously while driving. In this case, it is necessary to align and dynamically balance the tires of the car, and in serious cases, the tires must be replaced.

In addition to the tires of the car, there may also be shock absorber failure, frame deformation, excessive meshing clearance of the main and driven gears of the final reducer, etc. If the steering wheel shakes when braking while driving, then it is very likely that the brake force is too strong and too frequent, which may cause the brake disc and brake pads to overheat and deform when cold, causing the steering wheel to shake.

Generally, the symptoms can be solved after replacing the brake discs and brake pads. If the speed of the vehicle is not fast, but the steering wheel shakes, it is possible that the steering belt of the mechanical steering system will slip when the belt is too loose, which will also cause the steering wheel to shake, and there will be shaking and abnormal noise when the steering transmission system is loose and the gap is too large, but this situation is rare.

Hello, generally speaking, this idle jitter is caused by too much carbon deposit in the car or a clogged fuel injector.

Hello According to your description, the fault phenomenon: a 2010 BMW 730Li sedan with a mileage of about 70,000 km, the model is E66, and the N54 engine is used. The car idles and shakes.

Maintenance analysis: The maintenance personnel tested the car and found that the car was driving normally except for idle shaking. The engine control unit was inspected, and it was found that the fault code 279C--- electronically controlled thermostat failure, the fire of multiple cylinders --- 274E, the abnormal concentration of the mixture in cylinder row 1 of the 2882 ---cylinder row and the mixture concentration of cylinder row 2 --- 2883 were abnormal.

Read the data stream when the engine is idling. It was found that 1 6 cylinders all had misfires. However, after increasing the idle speed, the number of misfires was quickly reduced to 0.

This finding suggests that the air is not evenly distributed to the individual cylinders at low air intakes. This phenomenon is generally related to carbon deposits.

This problem is not caused by accessories, so it can't be repaired, only cleaning, and cleaning is not covered by the warranty. It shows that this is not a big problem, as long as you use Si Youpu fuel additive additive fuel tank 2 to run two tanks of oil. In fact, gas stations regularly clean underground oil tanks, not to mention fuel tanks, which are caused by poor combustion, that is, the oil circuit is a little dirty and there is no big problem.

Some new cars, especially direct injection vehicles, have black exhaust pipes, which does not mean carbon deposits, but it must mean that the combustion is not good.

For a long time, the vehicle will produce many other serious problems, such as burning engine oil, inability to consume fuel, accelerated aging of various accessories, and many places that cannot be solved are recognized as common problems.

If there is a solution to the problem, there is a resolution procedure for the contradiction, you can add two Siyoupu fuel additives to the fuel tank to run two tanks of oil, and the oil circuit will be clean, and it will not shake.

It would be nice to change the ignition coil spark plug set.

Check the spark plug ignition coil, which is generally this, after cleaning the oil circuit ......

1. ThrottleWhen we step on the accelerator, the vehicle has some shaking, and most of the time it is a problem with the throttle. When carbon deposits or other pollutants are adsorbed on the throttle, it will cause the amount of air inhaled by the engine to be out of proportion to the amount of oil sprayed out of the fuel injector, resulting in insufficient fuel when the engine is working, resulting in body shake. In this case, you can go to the repair shop to clean the throttle.

Second, the spark plug spark plug as the ignition device in the engine, if there is a problem with the spark plug, then there is no ignition of the mixed gas in the cylinder, and the cylinder will not work, so that the power of the vehicle will decline, which is what we call the lack of cylinder. If you drive a lot, when the vehicle feels a strong shake and the vehicle has no power, and this shake exists from the start of the vehicle to the shutdown, then most of the spark plug is a problem. At this time, it is necessary to check whether the spark plug in a cylinder is broken.

The spark plug is a consumable, for the car owner, the spark plug should be checked during regular maintenance, and the spark plug should be replaced in time if the spark plug is almost depleted.

Third, the rubber ball cover itself is a consumable part, the main role in the body is also to play the role of shock absorption and dustproof, generally installed in the connection between the engine and other components, when the rubber sleeve is damaged, when stepping on the brakes, you will feel that the vehicle has shake, release the brake shake and disappear, in this case you will have to check the ball cover. Fourth, brake pads, as an important part of vehicle braking, play a vital role in the safety of vehicle driving. As long as you drive, you will use the brakes, so the longer the time, the more the brake pads are worn.

When the brake pads are worn more, when the brakes are applied, the braking effect will be reduced, the body will shake, and there will be some sizzling sound at the wheels when braking. Then it's time to check the brake pads and replace them in time. For the sake of our driving safety, we must check the vehicle in time and replace the damaged parts.

The BMW 740i engine shakes the exhaust pipe, and the squeak is why the car shakes, and the most common reason is that the throttle is too dirty or the fuel injector has too much carbon. The three-way catalytic blockage leads to abnormal noise in the exhaust pipe. When the engine has too much carbon deposit, the gasoline sprayed by the cold-start injector will be absorbed by a large amount of carbon deposit, resulting in a thin cold-start mixture and difficult starting.

In this case, it is only when the gasoline absorbed by carbon deposits is saturated that it is easy to drive in a fussy manner. After driving, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine for combustion, so that the mixture becomes thicker, and the combustible mixture of the engine is sometimes dilute and sometimes thick, causing idle shaking after cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon will be deposited, which will affect the success of the cold start.

Solution: Clean the oil circuit, check whether the idle motor is bent and has carbon deposits, and it should be cleaned. The function of the three-way catalytic converter is to reduce noise while purifying the exhaust gas.

The length, thickness and density of the internal filters vary for different cars, depending on the exhaust gas cycle. Regular cleaning of the three-way catalytic converter can eliminate abnormal noise from the exhaust pipe.

Summary. Hello dear, it is a great honor to answer your questions here, our BMW 740 rpm is 1500 1800 to ten catties, the vehicle is shaking, the vehicle is shaking, in this case, we have to check whether the ignition coil spark plug has too much carbon deposit, resulting in the engine shaking problem caused by poor cylinder ignition. To solve the problem, we can take the spark plug out to take a look, if there is more carbon in the upper area, if there is more carbon deposit, we can deal with the carbon deposit or replace the spark plug to solve this problem, here I wish you a happy life, everything goes well, <>

<> BMW 740 between 1500 and 1800 rpm the car shakes.

Hello dear, very honored, here to answer your questions, our BMW 740 rpm in 1500 1800 to ten catties, the vehicle is shaking, the vehicle is shaking, in this case, we have to check whether the ignition Chong Hui Cong coil spark plug has too much carbon, resulting in the engine shaking problem caused by poor cylinder ignition. To solve the problem, we can take the spark plug out and take a look, if there is more carbon in the upper area, if there is more carbon deposit, we can deal with the carbon deposit or change the spark plug to solve this problem, I wish you a happy life, everything goes well, <>

<>Yes, dear, in this case, it is that the ignition wire family of our vehicle has too much carbon deposit. You can replace the spark plug to solve the problem, <>

Do a replacement to solve, we have this policy problem when the trillion mountain engine is driven, here I wish you a happy life and everything goes well.

Hello, please take a look at the answer to the question I gave you above. Check our ** coil to see if there is any leakage. Remove the spark plug to see if there is carbon deposit.

If you do too much, replace the spark plug to solve the problem pro. Then if the spark plug is replaced with a set, the cost is more than 300 yuan for three or four, and a set of spark plugs is replaced. Solve the problem of stuttering and jitter in this engine.

Is there a leakage eraser under the inspection of the ignition source wide fire coil? Is there a problem with cracking? If there is cracking of the eraser, replace it together to solve the problem pro, <>