The Mitsubishi-Lancer car is a long-liver of the Japanese automobile 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. Mitsubishi Lancer 9 is especially demanded in the secondary market. Its release ended almost ten years ago, but it is still popular.
When developing each new generation, designers try to eliminate the flaws inherent in previous models. Many shortcomings are eliminated, but, unfortunately, new ones appear.
Throttle device
Gasoline in the engine burns out for a reason. For full combustion requires a lot of air. Moreover, it should be in a certain quantitative proportion with the fuel. Gasoline is injected into the intake manifold using nozzles. The amount of fuel flowing through a special pipeline is regulated by a shutter. This part, installed in a special case, is called the throttle assembly. This shutter has the shape of a round plate overlapping the air pipe. The larger the opening angle, the more air enters the intake manifold, and rpm will increase. The opening angle is adjusted just by the gas pedal. The Lancer 9 throttle is driven by a stepper motor. The opening angle of the element registers the flap sensor. It is he who determines this parameter.
What can affect the operation of the node
The throttle in itself is a very reliable part. It is understandable, because the stable operation of the engine depends on the condition of the unit. Typically, the throttle "Lancer-9" begins to demand attention not earlier than 180 thousand km.
However, much earlier, every 20 thousand km, it is advisable to carry out preventive cleaning to avoid problems in the future. Interruptions in engine
idling or increased idle almost always indicate throttle contamination. The reason for this may be an increased release of oil through
the crankcase ventilation system, a clogged air filter, as well as a "congenital" defect in the fastening of the damper itself, which will be discussed below. Often there is a malfunction or breakdown
of the damper
position sensor or its actuator.
Symptoms of a throttle assembly failure
Since the element controls the air supply, it directly affects the stability and quality of idling. Also, his work determines the quality of engine starting. A characteristic feature (not only for the Mitsubishi Lancer 9, but also for many other cars with a similar air supply system) is floating idle speed. There are also jerks when driving at low speed.
How to clean the throttle "Lancer-9"
Prevention is preferably carried out at least once a year. This work is not difficult, but it can put off possible repairs and will save in the future. Cleaning the throttle valve "Lancer-9" is carried out on the machine itself, but it is much more convenient to do this with the removed unit. To do this, disconnect the heating hose and the air pipe, as well as the air supply sleeve and wiring from the stepper motor and the damper position sensor. An aerosol cleaner is used for cleaning. What to do if it is not? It doesn’t matter - a carburetor cleaner is also suitable for this operation. There are also similar dampers. The composition must process the entire air channel from the inside, paying special attention to the place of contact of the damper with the body. Most often, dirt accumulates there, causing interruptions at idle.
After applying the composition, it is necessary to clean all the internal surfaces of the throttle assembly with a soft cloth. Also, with the help of a cleaner, the sleeve for supplying air from the inside is treated. There are deposits of oil and just dust. It should be noted that the cleaning agent must not contain too aggressive components that could damage the rubber gaskets and axle grease. After that, you need to put everything in place and check the operation of the throttle. If the problem with floating idles remains, then you can not do without repair.
Throttle Repair
The throttle unit of the Mitsubishi-Lancer car has a “congenital” disease, which sooner or later appears on all generations. The fact is that the axis of rotation over time begins to move with play, just hang out with the damper itself. Since it completely closes the air channel in the closed position, with each movement it seems to rub against the walls. Dirt serves as an abrasive. As a result, the shutter is gradually developed at the edges, and a gap is formed through which air is sucked in.
There are two solutions to this problem - buy a new throttle assembly or grind another damper. Along with the manufacture of a new part (the “five-pound coin” of the Lancer-9 throttle valve, because it is exactly five centimeters in diameter), the throttle itself must be pierced to a size of 50.5 mm. The standard parameter is 50 millimeters. In this way, you eliminate the output from the backlash of the damper. After this, it is necessary to cover with molybdenum composition the place of contact of the shutter and the inside of the throttle. In addition, you need to install the axis on angular contact bearings, eliminating the bias from the operation of the throttle. It is possible to simplify the task and apply sealant in the place of contact of the shutter and the housing. But this is a temporary measure, and such a throttle repair is nothing more than a delay before a more serious repair. Therefore, if you repair, then it is thorough.
Throttle Position Sensor Features
One of the reasons for unstable idling may be a malfunctioning throttle sensor. The 9th generation Lancer is no exception. Typically, the diagnosis shows an error, but you can check the health of the sensor yourself using a multimeter. To do this, check the voltage at terminal “1” of the sensor block.
With the ignition on, the voltage should be between 4.8-5.2 V. With the ignition off and the throttle fully closed, the resistance between the terminals “2” and “3” of the sensor should be 0.9-1.2 kOhm.
Laying Issues
On the "Japanese" gasket throttle ("Lancer-9" including) has an interesting feature - it is asymmetrical. That is, with improper installation, the holes in it do not coincide with the channels in the throttle assembly. In addition, there will be a constant suction of air into the throttle space, due to which the idle speed will increase to 2000. For proper 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 mating plane to the intake manifold.
Idle adjustment
In the process of operation, another characteristic malfunction arises - the throttle ("Lancer-9" 1.6 including) bites (stops) in the ajar position. Because of this, idle speed increases.
To eliminate this malfunction, loosen the adjusting nut on the side of the throttle axis and turn the stop screw. After that, the shutter should click back to its original position (close). Tighten the nut and check the operation of the device. Typically, this phenomenon occurs with the already mentioned development of the walls of the throttle assembly due to the skew of the valve. To adjust the idle speed, a special screw is used, closed by a plug. They set idle speed of about 750 rpm.
Conclusion
Thus, the throttle "Lancer-9" is a fairly responsible unit of the car engine. Its proper operation is ensured primarily by timely prevention and proper adjustment.