How does the Nissan Qashqai idle unstable? What is the reason for the unstable idling of the Qashqai

1. Air intake system (1) When the intake manifold or various valves leak when the air, gasoline vapor and combustion exhaust gas that should not enter enter the intake manifold, the mixture is too thick or too thin, and the engine burns abnormally. When the leakage position only affects individual cylinders, the engine will shake more violently, which will have a greater impact on the idle speed of the cold car. Common causes are:

loose intake manifold clamp or cracked hose; Air leakage from the intake manifold gasket; Damage to the intake manifold or other parts to grind out of the intake manifold; Injector O-ring leakage; The plug of the vacuum tube falls off and cracks; The crankcase forced ventilation (PCV) valve has a large opening; The activated carbon tank valve is normally open; Exhaust gas recirculation (EGR) valve is not closed tightly, etc. (2) Excessive fouling of the throttle and inlet duct is too much carbon and dirt in the throttle and surrounding inlet tracts, and the cross-sectional area of the air passage changes, so that the control unit cannot accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal. Common causes are:

The throttle valve has oil or carbon deposits; There is oil and carbon deposits in the air intake tract around the throttle; Idle stepper motors, duty cycle solenoid valves, and rotary solenoid valves have oil stains and carbon deposits. (3) Failure of idle air actuator, failure of idle air actuator, resulting in inaccurate control of idle air. Common causes are:

throttle motor damage or card issuance; Idle stepper motors, duty cycle solenoid valves, rotary solenoid valves are damaged or hairpinned. (4) The inaccurate air intake control unit receives the wrong signal and sends out the wrong command, which causes the engine idle air intake to be inaccurate and makes the engine burn abnormally, which is the indirect cause of the idle instability. Common causes are:

Failure of the air flow meter or its wiring; Failure of the inlet pressure sensor or its wiring; The plug of the engine control unit is in poor contact due to water ingress or internal computer failure. 2. Fuel system (1) Injector failure: The fuel injection volume of the injector is uneven and the mist is not good, resulting in an imbalance in the power emitted by each cylinder. Common causes are:

Fuel injector clogging, poor sealing, injecting fuel in a linear pattern, etc.

Most of the cold start jitter is caused by poor fuel combustion, the fuel tank has more gum moisture, too much carbon deposition inside the engine, and the cold start is not brought to the combustion chamber and then mixed in the fuel tank is driven into the combustion chamber, and the jitter caused by poor combustion. The gasoline emitted by the cold start injector will be absorbed by carbon deposits, resulting in a dilute mixture for the cold start, which makes the start jitter.

If carbon deposits occur in the valves and intake tracts of the engine, the ECU will make an error in judgment because the carbon deposits can absorb the appropriate amount of fuel. If the computer actually controls the injection of hypothetical 100 parts of oil and gas, but only 90 parts actually enter the cylinder (10 parts are absorbed by carbon deposits), then even if the remaining 90 parts of mixed oil and gas are fully combusted, this cannot achieve the required power, and the phenomenon of jitter is inevitable.

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.

Causes of unstable car idling.

1. Air leakage from the intake manifold.

When the air that should not be entered, gasoline vapor, and combustion exhaust gas enter the intake manifold, the mixture is too thick or too thin, causing the car to idle unsteadily.

2. Too much carbon deposition on the throttle.

Excessive carbon deposition in the throttle valve and surrounding air intakes, and changes in the cross-sectional area of the air channel, make it impossible for the control unit to accurately control the amount of air intake at idle, which will also lead to too thick or too thin mixture, resulting in unstable idling of the car.

3. Failure of the actuator of the air intake system.

There are many actuators in the engine intake system, such as throttle motors, idle stepper motors, duty cycle solenoid valves, air flow meters, intake pressure sensors, etc., which cause the car to idle unstable.

4. Fuel system failure.

Faults such as clogged injectors, clogged fuel filters, clogged fuel pump filters, faulty fuel pressure regulators, and clogged return pipes can all lead to incorrect fuel injection, resulting in over-concentrated or over-thin mixtures, resulting in unstable car idling.

5. Ignition system failure.

Faults such as ignition module failure, incorrect spark plug clearance, spark plug electrode ablation or damage, and excessive resistance of the high-voltage line lead to a decrease in ignition spark energy or misfire, resulting in unstable idling of the car.

The reasons for the unstable engine idle speed may be:

1. Dirty, worn, incorrect installation of mechanical parts, etc., resulting in changes in the power of individual cylinders, resulting in unbalanced power of each cylinder, resulting in unstable idle speed of the engine, abnormal engine electronic control system, resulting in poor combustion of mixed gas, making it difficult to balance the power of each cylinder, and making the engine idle unstable;

2. There is too much carbon and dirt in the throttle and the surrounding air intake, and the cross-sectional area of the air channel changes, so that the control unit can not accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal;

3. The fuel pressure is too low, which directly leads to the mist sprayed out, and the spray quality is poor, and only part of the oil droplets appear at the fuel injection port in serious cases. The main manifestation is that the mixture emissions are too thin, which leads to unstable engine idling and low speed, which is often accompanied by the phenomenon of lack of fire;

4. The internal fuel injection of the injector is small, showing fog and smoke outside, which will lead to insufficient power generated by each part of the cylinder, resulting in abnormal engine starting;

5. If the circuit of the sensor fails, it may be caused by a short circuit, open circuit or the sensor is not grounded. These faults cause errors in the commands issued by the control unit, resulting in inaccurate measurements of the injected volume and thin or dense mixtures.

The reason why the Qashqai engine failure light is on is:

1. The inside of the engine cylinder is not clean and there is carbon deposit. After a certain period of use, there will definitely be some carbon accumulation inside the engine, which will lead to changes in the design parameters of the engine, and at the same time, the properties are unstable and heat accumulates, which will lead to disorderly ignition of the engine and cause engine knocking. The engine fault light will come on;

2. The poor combustion state of the engine is the main reason why the engine failure light is on. In the design of the car, in order to ensure that the engine is in good working condition and ensure the normal working life of the engine, an oxygen sensor is designed and installed on the engine to monitor the combustion state of the engine.

Vehicles that have not passed the warranty period first go to 315 consumer rights protection complaints! Then complain on the manufacturer's official website! Then go to your 4S shop to check and replace the vortex flip control valve!

Your car is not out of warranty. Don't go to other auto repair shops for repairs without permission, go directly to a 4S shop. Let them repair it, and if they don't repair it, let them change the car and return the car.

This matter can be returned to the 4S store to continue to detect and fix. If it detects that the vortex flip control valve is faulty, then it is time to replace it!

There are many reasons: poor oil quality will cause the engine failure light to be on, the three-way catalytic converter can be replaced, the mixture fuel is not good, and the sensor is wrong.

It could be that the quality of the oil is not good, but you have no proof. At the same time, the car is still within the warranty period, and you can go to the 4S store to ask for the warranty.

The lights such as the D gear of the car uphill are obviously shaken, the idle speed of the flat slope is slight, the N gear is not shaking, and the foot brake has been stepped on the end when parking. The car has just been bought for 6 months, with a mileage of more than 3,000 kilometers, and it has been maintained 2 times. Please help the experts!

The lights such as the D gear of the car uphill are obviously shaken, the idle speed of the flat slope is slight, the N gear is not shaking, and the foot brake has been stepped on the end when parking. The car has just been bought for 6 months, with a mileage of more than 3,000 kilometers, and it has been maintained 2 times. Please help the experts!

The reason for the engine idle shake is the change of the gas force in the cylinder, which causes the power imbalance of each cylinder, resulting in the inconsistent horizontal component of each piston during the power stroke, and the unbalanced torque of the engine laterally shakes. The phenomenon you are reporting may be that the engine mount has a large amount of space and cannot effectively filter the vibration generated by the engine. Because you can't see the actual car and can't make an accurate judgment of the fault, it is recommended that you contact your local 4S shop for inspection and maintenance.

Nissan Qashqai ( Price |Detailed description of the model ) How much is the normal idle speed? Auto Network: I'll answer for you.

The normal idle speed of the Nissan Qashqai is generally 600 800 rpm. Idle speed means that the engine runs under no load, and only needs to overcome the frictional resistance of its own internal parts, and does not output power to the outside world. The minimum speed at which an engine runs smoothly is called idle speed and is one of the five basic operating conditions of an engine.

When the engine is idling, it is called idling. When the engine is running, if the accelerator pedal is completely relaxed, the engine is idling. The rotational speed at which the engine is idling is known as the idle speed.

The idle speed can be adjusted by adjusting the damper size, etc. Generally speaking, the lowest idle speed is the lowest speed when the engine is not shaking. When the engine is running, if the accelerator pedal is completely relaxed, the engine is idling.

When adjusting the idle speed, the speed should not be suddenly high or low, otherwise it will cause early wear and tear on the engine, and it is best to go to the car maintenance department to adjust.

General comment: Qashqai, the first creation of the Nissan European Design Center, takes its name from the nomadic tribes of Iran who live in the desert area, meaning "urban nomads". Positioned between a compact SUV and a hatchback.

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The reason why the Nissan Qashqai has been unstable in idle for 10 years and has no fault code: 1Fuel System Issues:

Clogged fuel filters, faulty injectors, and fuel pump issues all affect the engine's idle stability. 2.Air Flow Meter Questions:

The damage failure of the air flow meter caused the engine to not correctly calculate the amount of air inflow, which affected the stability of the idle speed. 3.Air line leaks:

Air line leaks can reduce the flow of air into the engine, which can affect the stability of idle speed. 4.Throttle position sensing wax stove problem:

The damage and failure of the throttle position sensor will affect the engine control module ECM to not correctly obtain the accurate position information of the throttle, thus affecting the stability of idling. The above is the reason why the 10-year Nissan Qashqai idling is not hail stable and has no fault code.