How to judge the quality of fuel injectors?

When checking the fuel injector, the engine's speed sensor should be normal, and the fuel pump relay (the fuel pump relay provides power to the injector) should also be normal.

Remove the upper body of the intake pipe and remove the spark plug.

plug, remove the injector cover, and remove the plug from the injector.

Connect the diode tester to the 1-cylinder injector plug terminal with the auxiliary wire.

on, start the engine, light-emitting diodes.

Must be shiny, repeat the above test on the 2 4-cylinder injector plugs.

If the diodes in each cylinder are not illuminated, connect the diode tester between the injector terminals of the 1 cylinder and the hitter.

To start the engine, the LED must be shining. If the diode does not shine, follow the circuit diagram.

Check for open wires between the injector 2-prong plug terminals and the fuel pump relay.

If the diode does not shine on one or more cylinders, check the circuit diagram for open wires between the injector plug terminals and short circuits between the wires.

Check the injector resistance between the contacts. The specified value of the injector resistance is 13 18 (high resistance type), and the resistance is increased by 4 6 when the engine is hot, otherwise the injector should be replaced.

2.Detect the resistance of the fuel injector.

When the injector is blocked, dripping and other faults, the engine ECU cannot detect it, and the fault information of the injector cannot be read by using the fault reader. The service injector can be judged by detecting its resistance and voltage.

with a multimeter. OHM 200 or R 1 detects injector solenoids.

of resistance. During the test, unplug the two-terminal wiring harness plug on each fuel injector, and test the standard resistance value of the electromagnetic coil between the two terminals on the fuel injector socket, which shall comply with the provisions in the following table. If the resistance value is infinity, it means that the solenoid coil is open and the injector should be replaced.

When the fuel injector fails, it will lead to an increase in carbon deposition in the engine, unstable idling, increased fuel consumption, weak acceleration, difficult starting, excessive emissions, etc., and in serious cases, it will cause the fuel injector to be blocked, and then damage the engine.

When encountering a blocked fuel injector, pay attention to the following points;

First, don't coax the throttle with a big foot, especially if the fuel injector is blocked, which will cause the fuel injector to be completely damaged.

Second, the fault light is not good for a long time, and the fault light will be reported after a certain number of times, indicating that the car is not burning well before, which may be oil or oil deterioration and there is no good fuel to burn.

Third, in the case that the oil circuit is not cleaned and improved, cleaning the throttle will lead to increased air intake, thinning of the mixer, and the vehicle will shake at idle, and the throttle will be channeled.

Fourth, repairing a car does not mean that it will be good, and repairing it may aggravate problems in other places. This is normal and requires the use of elimination.

Fifth, in the case of poor combustion, shaking, and scurrying, the first thing to clean the oil circuit is, and not to rush to replace the accessories.

This is very easy to deal with, encounter such a fault code, after the detection, it has been determined that the fuel injector is blocked, then the traditional way is to disassemble the fuel injector to replace, not to mention the replacement of the labor costs, we will say the reason for this, we have to first figure out why it will be blocked, will be after the replacement, to avoid the later blockage, after all, the replacement cost is very high, you replace the plug again, is it to consume a lot of cost.

There are two types of blockage, one is the external blockage caused by ash and carbon deposits on the outside of the fuel injector in the combustion chamber, and the other is the internal blockage caused by the oil in the oil circuit. Both of these blockages can be cleaned and unblocked by PNF-based additives. But be sure to use effective additives.

Don't wait for the car to have a problem before thinking about changing the parts, the cost outweighs the loss.

The dismantled fuel injector may leak oil, and there is a small rubber ring on the fuel injector, if it is not properly installed, it may drip oil, then it will accelerate poorly, or even stall. You should ask them to check it again, clean the fuel injector throttle without dismantling, the dismantled things can not be restored to the original level, it is recommended to disassemble and clean.

Hello, you can use an oscilloscope, if the conditions do not allow, you can remove it and use the battery to ride, I hope it can help you.

There are two types of injector defects: 1. Mechanical stagnation or blockage; 2. Circuit faults.

For the first case, it can be removed and placed on the injector cleaning agent for experimentation.

For the second case, the fault code can be read through the decoder, or the injector working sound can be listened to one by one through the stethoscope, and the control signal and coil of each injector can also be measured.

The method of correctly judging the fault of the fuel injector: 1. Use a multimeter to detect the resistance value of the electromagnetic coil of the fuel injector; 2. Unplug the wiring harness plugs of the two terminals on each injector during the test, and detect the standard resistance value of the electromagnetic coil between the two terminals on the injector socket; 3. If the resistance value is infinity, it means that the electromagnetic coil is broken, and the fuel injector should be replaced.

When the engine is difficult to start, the power drops, the fuel is not grease sprayed or the high-pressure knocking sound is generated in the fuel system, it is possible that the fuel injector is overheated, the needle valve is burned out and cannot be opened, and the needle valve sticks to the valve seat due to too much carbon deposit.

1. How to find out if there is a problem with the fuel injector?

1. Fault indicator.

This is the most intuitive, the easiest, and the clearest way to tell us what went wrong. No matter what kind of car, as long as there is a problem with the engine-related parts, an engine logo will appear on the display interface in the car, and then we must pay attention to it, because it is definitely not a trivial matter for this sign to be lit.

2. Driving power.

Although the horsepower of the vehicle is different, it is different in terms of acceleration and power, but if you drive a car for a long time, you must know a lot about the acceleration and power of the car. If there is a sudden slow acceleration, the gas pedal does not go, and the engine sound is too loud, then there is a problem with the fuel injector, which proves that the engine is overloaded at this time, then we have to quickly drive the car to the 4S shop for inspection.

3. Fuel consumption.

Some friends may ask, since they are all blocked, shouldn't they be more fuel-efficient? How can fuel consumption increase? In fact, if you know, you will understand how the fuel injector works.

Gasoline is transferred from the fuel tank to the injector, where it is atomized and sprayed by the injector, and the general fuel consumption is maintained at a balanced value. However, if the fuel injector fails, it may not be sprayed, but will flow out directly, causing incomplete combustion of gasoline. So it will deepen fuel consumption.

Therefore, when the fuel consumption is abnormally high, it should be a problem with the fuel injector.

Broken cylinder. If it is not EFI, loosen the high-pressure oil pipe to see if it works, and if it is EFI, remove the wire of the nozzle to see if it works. If it doesn't work, change the nozzle. This kind of nozzle is not easy to apply pressure inspection.

1. Special equipment testing. It is to remove the injector and take it to the injector test bench for testing. If the detected injection pressure does not meet the corresponding technical standards, the atomization degree of the injector is not good, there is oil dripping or leakage, and the injector that cannot be restored after cleaning and adjustment must be replaced.

2. Detect on the engine. (1) The quality of the injector can be judged by the difficulty of starting the engine cold engine and the exhaust smoke color after starting. It is difficult to start the engine cold, the exhaust smoke after starting has white smoke or black smoke, if the oil supply angle and cylinder pressure are normal, the injector and high-pressure oil pump may fail; (2) If you want to specifically judge which cylinder of the injector is not working well, you can use the cylinder breaking method.

After the engine starts, maintain a stable speed, and then loosen the high-pressure oil pipe one by one, that is, disconnect the oil supply of a cylinder, and see if the speed of the engine changes: if the speed of the generator decreases significantly after the cylinder is broken, it means that the combustion of the cylinder has an effect on the engine, and the injector of the cylinder is good; If the speed of the generator does not decrease significantly after the cylinder is broken, it means that the combustion of the cylinder has no effect on the engine, and the white smoke or black smoke of the engine is less, indicating that the injector of the cylinder is bad. (3) The injector can be disassembled, the injector has a lot of carbon accumulation and is very wet, then the injector does not work well.

4) If you find that the engine oil is thinner and the engine oil smells of diesel, it is often related to the failure of the injector.

It can be detected in the car. Start the vehicle first, so that the water temperature of the vehicle reaches the normal range, under the premise of no fault code. Appropriately increase the throttle, the speed will quickly rise with the increase of the throttle, and the engine sound is clear and powerful, which proves that the engine is in normal condition (but it cannot prove whether the injector is in good condition); Then fold two paper towels on top of each other, appropriate close to the exhaust pipe opening, and see if it will be black on the paper towels (if black smoke appears, it is the engine's mixture that has not been completely burned).

The simple two basically judge the basic working condition of the engine, and the quality of the injector injection directly affects whether the engine can work normally.

The injector detection is mainly to see the atomization of the oil it sprays, the opening and closing of the nozzle valve is normal, whether the oil supply of each cylinder is equal in the same time, and whether the fuel injector has oil leakage.

The injector cleaning machine can be detected.

Judge the failure of the fuel injector:

1. The body is a little shaky when driving and starting.

2. The work of the precision parts of the electronic injection system is unstable, resulting in a decrease in power performance.

3. The engine idle speed is unstable, the fuel consumption increases and the exhaust emission deteriorates.

Use the method of power-off to cut off the grease nozzle line of each cylinder in turn. If the engine has obvious shaking, it means that it is working. Otherwise, there is no work. If you want to see if the grease nozzle is working in good condition. In general, proprietary instruments are required.

Methods of Judgment:

1. The engine noise becomes louder, especially in low gear and below 2500 rpm 2. The throttle response is not sensitive, the acceleration is not smooth (compared with the new car), the throttle feels lagging, and the tachometer needle rises slowly in the neutral gear.

3. Small-range jitter at idling.

4. It is easy to shake at the start and it is not easy to control and eliminate, and there is a slight lack of cylinder in the 12-speed low-speed upshift.

As one of the key components of the EFI engine, the fuel injector will seriously affect the performance of the engine. A clogged fuel injector can seriously affect the performance of the car. The cause of the blockage is due to the deposit of carbon in the engine on the fuel injector, or due to impurities in the fuel that block the injector path.

In daily life, we should pay attention to the problem of carbon deposition to reduce the damage of fuel injectors.

Fuel injector dirty car symptoms:

1. The engine noise becomes louder, especially in low gear and below 2500 rpm (no matter how high it is, it may be because the OO engine is noisy at high speed).

2. The throttle response is not sensitive, the acceleration is not smooth (compared with the new car), the throttle feels lagging, and the tachometer pointer feels slow to rise in neutral gear.

3. Small-range jitter at idling.

4. It is easy to shake at the start and is not easy to control and eliminate, and there is a slight lack of cylinder in the 12-speed low-speed upshift.

If one of the items cannot be completely eliminated after cleaning the idle motor and throttle, it is estimated that the fuel injector is dirty.

Landlord, the lack of power at the same speed is very obvious.

Hee-hee......

Symptoms of a car with a dirty fuel injector:

1. The noise of the car engine becomes louder, especially when it is in low gear and below 2500 rpm (no matter how high it is, it is not obvious, perhaps because the engine may be noisy at high speed).

2. The car throttle response is not sensitive, the acceleration is not smooth according to the new car, the throttle feels lagging, and the tachometer pointer feels very slow when the neutral gear is rushing to the fuel.

3. Small-range jitter at idling.

4. The car is easy to shake at the start and is not easy to control and eliminate, and there is a slight lack of cylinder in the 12-gear low-speed upshift.

If the item cannot be completely eliminated after cleaning the idle motor and throttle, it is estimated that the fuel injector is dirty.

Fuel injection drops, the car shakes when starting, and the engine is louder than before. You can judge that the fuel injector is dirty or even blocked.

If the engine noise becomes louder, especially when it is in low gear and below 2500 rpm, it is necessary to consider that the fuel injector is dirty; The throttle response is not sensitive, the acceleration does not feel smooth, the throttle obviously feels lagging, and the tachometer needle rises slowly in neutral gear may also be caused by this reason.

A dirty fuel injector in a car can cause the vehicle to shake. Dirty engine throttle valves or excessive carbon build-up in fuel injectors can cause the vehicle to shake.

It automatically turns off the engine at idle.

How can you tell if the injector is dirty? After a long time, clean up quickly, because you may not be able to judge well, so let time decide how often to clean up. Give yourself a rule.