Throttle "Lancer-9": possible damage, repair, replacement

The Mitsubishi Lancer car is a long-liverJapanese automotive industry (now the tenth generation is being produced). It is appreciated for its unpretentiousness, reliability, good maintainability. Also, motorists are attracted by a good combination of price and quality and high consumer properties. Particularly in demand in the secondary market of Mitsubishi Lancer 9. Its release ended almost ten years ago, but it is still popular.

In the development of each new generation, designers are trying to eliminate the drawbacks inherent in previous models. Many defects are eliminated, but, unfortunately, new ones are emerging.

Throttle Body Assembly

Gasoline in the engine burns for a reason. To fully burn requires a lot of air. And it should be in a certain quantitative proportion with fuel. Gasoline is injected into the intake manifold by means of injectors. The amount of fuel delivered through a special pipeline is regulated by a damper. This part, installed in a special body, is called the throttle assembly. This damper has the form of a circular plate overlapping the air pipe. The larger the opening angle, the more air enters the intake manifold, and the revs will increase. The opening angle is regulated by the gas pedal. The throttle valve Lancer 9 is driven by a stepper motor. The opening angle of the element registers the damper sensor. It is he who determines this parameter.

What can affect the operation of the node

The throttle itself is a very reliable part. It is understandable, because the state of the node depends on the stable operation of the engine. Usually the Lancer-9 throttle starts to demand attention not earlier than 180 thousand km.

However, much earlier, every 20 thousand km,it is desirable to carry out preventive cleaning to avoid problems in the future. Interruptions in the engine at idle or increased idle almost always indicate the contamination of the throttle. The reason for this may be an increased oil release through the crankcase ventilation system, a clogged air filter, as well as a "congenital" defect of fastening the damper itself, which will be discussed below. Often there is a malfunction or failure of the sensor position of the damper or its drive.

Symptoms of a malfunction of the throttle assembly

Since the element regulates the air supply,it directly affects the stability and quality of idling. Also, his work determines the quality of the engine start. A characteristic feature (not only for the Mitsubishi Lancer 9, but also for many other cars with a similar air supply system) is a floating idling speed. Also there are jerks when the car is moving at low speed.

How the Lancer-9 throttle valve is cleaned

It is advisable to conduct prevention at least once inyear. This work is simple, but it can push back possible repairs and will save in the future. Cleaning the throttle valve "Lancer-9" is carried out and on the machine itself, but it is much more convenient to do this with the removed node. To do this, disconnect the heating hose and air hose, as well as the air supply hose and the wiring from the stepper motor and the damper position sensor. For cleaning, an aerosol cleaner is used. What if there is none? It does not matter - for this operation is suitable and a cleaner for carburettors. There, too, there are similar shutters. The composition is necessary to process the whole air channel from the inside, paying special attention to the place of contact of the flap with the hull. Most often, dirt accumulates there, causing interruptions at idle.

After the application of the composition, allinternal surfaces of the throttle assembly with a soft cloth. Also, with the help of a cleaner, the air supply hose is processed from the inside. There are deposits of oil and dust. It should be noted that in the cleaning agent should not be too aggressive components that can damage rubber gaskets and lubrication of the axis. After this, you have to put everything in place and check the operation of the throttle. If the problem with floating idle has remained, then repair can not be avoided.

Throttle valve repair

Misubisi-Lancer car chokehas a "congenital" disease, which sooner or later manifests itself on all generations. The fact is that the axis of rotation with time begins to move with the backlash, simply hanging out with the damper itself. Since it completely closes the air channel in the closed position, with every movement it seems to rub against the walls. Dirt is an abrasive. As a result, gradually the flap is produced at the edges, and a gap is formed through which air is sucked.

There are two solutions to this problem: to buyA new throttle assembly or milled another damper. Together with the manufacture of a new part ("penny" of the throttle valve "Lancer-9", because it is exactly five centimeters in diameter), it is necessary to pierce the throttle itself to a size of 50.5 mm. The standard parameter is 50 millimeters. Thus, you eliminate the output from the damper flap. After that it is necessary to cover the molybdenum composition with the contact place of the damper and the inner side of the throttle. In addition, you will need to install the axle on the radial thrust bearings, eliminating the skewing of the throttle. It is possible to simplify the task and apply sealant in the place of contact between the damper and the body. But this is a temporary measure, and such a throttle valve repair is nothing more than a delay before a more serious repair. Therefore if to repair, it is already thoroughly.

Throttle Position Sensor Features

One of the reasons for the unstable idlingthere may be a malfunctioning throttle sensor. The "Lancer" of the 9th generation is no exception. Usually, the diagnosis shows an error, but you can also check the functioning of the sensor yourself using a multimeter. To do this, check the voltage at the terminal "1" of the sensor shoe.

When the ignition is switched on, the voltage should be within the range of 4.8-5.2 V. With the ignition switched off and the full throttle closed, the resistance between the terminals "2" and "3" of the sensor should be 0.9-1.2 kΩ.

Problems associated with the gasket

On the "Japanese" gasket throttle("Lancer-9" including) has an interesting feature - it is asymmetrical. That is, with an incorrect installation, the holes in it do not coincide with the channels in the throttle assembly. In addition, there will be a constant sucking of air into the zadrosselnoe space, due to which the idling speed will increase to 2000. For correct orientation during installation, the gasket is equipped with a special corner located on the right. It can be seen if you look at the throttle assembly from the side of its landing surface to the intake manifold.

Idling adjustment

In the process of exploitation, anothera characteristic malfunction is the throttle (Lancer-9, including 1.6) is biting (locked) in a slightly open position. Because of this, idle speed is increased.

To remedy this, you need toLoosen the adjusting nut on the side of the throttle shaft and turn the stop screw. After that, the flap should return to its original position (close) with a click. Tighten the nut and check the operation of the device. Usually, this phenomenon happens at the already mentioned development of the walls of the throttle assembly due to the skewing of the flap. To adjust the idling, a special screw is used, which is closed with a plug. They set idle speed of about 750 revolutions per minute.

Conclusion

Thus, the throttle valve "Lancer-9"sufficiently responsible engine engine unit. Its correct operation is provided primarily by timely prevention and proper adjustment.