What s wrong with Fox idling?

Check the carbon deposit, when the carbon deposit inside the engine is too much, the gasoline sprayed by the cold start fuel injection head will be absorbed by the carbon deposit, resulting in the cold start mixture is too thin, and the gasoline adsorbed on the carbon deposit after the car will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixed gas becomes thick, and the combustible mixed gas of the engine is dilute and thick, resulting in idle shaking after cold start.

1. Detection steps for engine idle shake and unstable faults.

After starting the engine, the "Check Engine" warning light is off.

1. If the warning light is not extinguished, check the cause and location of the fault according to the fault code.

The warning light turns off to determine the idle speed matching setting.

Check whether there is a lack of cylinder, whether the sub-cylinder line is correct, and the connector connection is reliable.

Check that the idle actuator is normal.

According to the signal voltage of the oxygen sensor, determine whether the idle mixture is too thick or too thin.

If it is too concentrated, check whether the oil pressure of the system and each sensor are normal, check whether the activated carbon tank is working normally, check whether the actuator of the fuel system is working properly, and check whether the ignition system is working properly.

If it is too thin, detect whether the ignition system is normal, detect the oil pressure of the system, check whether the vacuum leaks, detect whether the sensors are normal, and check whether the pressure of the injector, EGR valve and cylinder is normal.

Inspect the engine mount and cushioning pads for damage.

2. Troubleshooting methods.

Carry out the cylinder breaking test, when the 1-cylinder high-voltage line is unplugged, the engine speed increases instead, when the 4-cylinder high-voltage line is unplugged, the engine has no obvious reaction, when the cylinder high-voltage line is unplugged, the speed is reduced.

Removed 4 spark plugs, found that the central electrodes of the cylinder spark plugs were ablated, replaced all the spark plugs to start the engine, and the idle speed improved slightly.

Check the air intake system.

No air leakage was found, so the idle valve was removed and checked, and the idle channel and valve were cleaned and installed with cleaning agent, and the test run did not solve the problem.

Considering that the engine acceleration is normal, and the fault code is not read out by the instrument, it is believed that it cannot be caused by a faulty circuit or ECU, and the fuel system should be fine.

Unstable idling can be due to the following reasons:

1. The engine has serious carbon deposits.

When the carbon deposit inside the engine is too much, the gasoline sprayed out by the cold start fuel injection head will be absorbed by the carbon deposit 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 the carbon deposit is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposit 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.

2. Excessive fouling of the throttle and inlet tract.

The excessive carbon and dirt deposits in the throttle valve and the surrounding air intake, and the change in the cross-sectional area of the air channel, make the control unit unable to accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal.

3. The spark plug spark caused by individual spark plug failure is too weak.

Spark plugs can also build up carbon, which can be cleaned to restore spark plug activity, but some spark plugs are nearing the end of their useful life and their performance will be reduced. The spark plug spark on the individual cylinder is weak, which will affect the performance of the car, and the spark plug failure will cause the car to have the symptoms of "lack of fire", but the spark plug of the individual cylinder will have idle instability symptoms if there is a slight fault.

4. Fuel pressure failure.

If the oil pressure is too low, the atomization state of the fuel injected from the injector is poor or the fuel injected is linear, and only oil droplets are sprayed in serious cases, and the amount of fuel injected is reduced to make the mixture too thin; The oil pressure is too high, and the actual fuel injection volume increases, making the mixture too concentrated.

5. Failure of various parts.

Leakage of intake manifold or various valves, failure of fuel pressure, low oil pressure, failure of ignition system, etc., can also cause engine idling instability.

The reason for the unstable idle speed of the Focus air conditioner is: the situation caused by the fuel storage of the throttle and the carbon deposit of the throttle.

The solution is: if it is the fuel storage and carbon deposit of the throttle valve of the car, you need to go to the 4S shop or maintenance shop of the car in time to clean the throttle valve of the car to solve the problem of idle instability when the Focus turns on the air conditioner.

A blocked intake tract can cause an idle pull, and the presence of carbon or oil in the throttle valve is the most common cause of idle instability. Due to carbon deposition, the throttle will affect the opening and air intake, so that the engine speed of the car will be high and low after the cold start, which is very unstable and accompanied by strong shaking.

Hello, dear <>

Causes of Fox idle speed fluctuations: the idle switch is not closed, the idle control valve is faulty, the air intake line is leaking, the fuel injector is dripping or blocked, and the EGR valve is open under idle conditions. The fault judgment and solution of Fox idle instability are as follows.

1. The idle switch is not closed. Turn on the air conditioner and turn on the steering wheel The engine speed does not rise, and the throttle position sensor needs to be adjusted, repaired or replaced; Second, the failure of the idle speed control Hehe valve. If the idle control valve does not make a sound, the idle control valve should be cleaned or replaced, and the idle speed should be basically set with a special decoder; 3. Air intake pipeline leakage.

If the cylinder pressure is not within the standard value range or the timing is incorrectly marked, the gas distribution phase should be readjusted according to the standard; Fourth, the injector is clogged or dripping. If the injector has no actuation sound or the amount of fuel injected exceeds the standard, the injector needs to be cleaned; Fifth, the egr valve is opened chaotically under idle conditions. Remove the EGR valve to block the exhaust gas recirculation channel, and remove the carbon deposits on the EGR valve or replace the EGR valve.

After the new overhaul, the idle unstable throttle valve has also been replaced with a new one, can it idle or unstable?

The idle switch is not closed, the idle control valve is faulty, the air is leaking in the inlet and erection positive gas pipeline, the injector is leaking or blocked, and the EGR valve is opened under idle working conditions.

Hello, this is generally a car for a long time at low speed, resulting in too much carbon deposition in the engine, resulting in insufficient combustion, white smoke, engine shaking, weakened power, too high speed, sudden shutdown, etc., fuel consumption will also increase, it is recommended to clean the engine, throttle and spark plug, matching debugging, power will return to normal.

What is going on with the idle instability of the Fox air conditioner, the engine idle shake fault diagnosis generally has several situations, the engine carbon deposition is serious and the most common cause of car shake is the engine internal division of the general idle jitter fuel additive cleaning agent, which can remove carbon deposition without disassembling the engine oil to clean the carbon sludge, it is very convenient to use, the suspension differentiation is not blocked, and it is miscible with the engine oil will not lead to delamination, better and safer cleaning your engine.

Summary. Hello, this Ford Focus hot car after the idle is unstable, the throttle is high and low, in this case, you first need to clean the throttle, and then do a throttle matching, to see if it can return to normal, if it can not return to normal, then you need to use the computer to detect it, see what fault code the engine control system reports, and you need to check whether the vacuum tube on the intake pipe is installed, or the vacuum tube is broken, resulting in air leakage.

The Fox hot car idles erratically, up and down.

Hello, I'm helping you sort out the answers to your questions, please wait a moment

Hello, this Ford Focus hot car after the idle is unstable, the throttle is high and low, in this case, you first need to clean the throttle, and then do a throttle matching, to see if it can return to normal, if it can not return to normal, then you need to use the computer to detect it, see what fault code the engine control system reports, and you need to check whether the vacuum tube on the intake pipe is installed, or the vacuum tube is broken, resulting in air leakage.

Look at you this failure should be throttle problem. Have you repaired any of those things? Read the throttle position sensor signal, voltages 1 and 2, and the data flow is abnormal. And what is the empty stream data.

The throttle was cleaned, all the vacuum tubes were blocked, and the manifold pressure varied with the idle speed between 28 and 35 kPa.

The manifold pressure varies with idle speed between 28 and 35 kPa.

Just picked up the car, didn't fix it elsewhere.

If you only care about the pressure of this air intake, you can't see it now, because you are now idling unstable, it must have changed this pressure, you are currently reading two places first, the first is the data of the empty flow, and the normal is about right. The second is the throttle position sensor signal voltages 1 and 2.

If you plug all the vacuum tubes, and it's still going to be like this, then the problem must be in the air flow and the throttle.

The throttle is added to 5V, and there is no empty flow.

That throttle signal voltage is normal. Or can swim. Dial out the intake pressure sensor and take a look.