Importance of engine adjustment
The most common reason for rejecting the technical examination is excessive emissions specified in the approved standards. The presence of more than the permissible limit of air polluting gases in the exhaust path of your car indicates that the engine is not adjusted. Of course, it should be noted that the technical examination does not always lead us to engine tuning centers.
Sometimes, the check light turning on, the car running low, or the so-called shortness of breath may also lead the owner to these centers.
Car's need to adjust the engine
Decreasing the car's acceleration
Bad engine start
Vibration while working in situ
Abnormal engine noise is heard
Black smoke coming out of the exhaust
Increased fuel consumption
Crude burning or ripping of the engine
The reasons for turning on the car's check light
Sensor failure or failure (map sensor, air temperature sensor, water temperature sensor, oxygen sensor, etc.)
Defects in actuators (such as stepper motor, injector needle, relay or fan resistance...)
Declaring improper emission conditions (such as catalyst failure that can lead to failure of the technical inspection emission test.)
Worn parts and problems in electronic systems such as oxygen sensor or valve shaft sensor can be one of these reasons. If any of these sensors and actuators have a problem, it will affect the performance of the car's engine and you may experience symptoms such as the engine malfunctioning, the car starting late, or the car not starting. Engine adjustment, which is also considered as a part of car maintenance.
An important point to be considered in this regard, a person who works as a tune-up must also master some mechanical points. For example, to find out if your timing belt is set correctly or not, or if the valve clearance is set correctly or not.
Adjusting the valve clearance is known as filler, which must be done in the old Pride B3 and Peugeot 206 TU3 or Nissan Zamiad engine, and it is known as shim in the XU7 engine. When the engine is running, the amount of this leakage increases and decreases, which causes the acceleration of the car to decrease or increase the noise of the engine or decrease the power of the car due to the decrease in compression. When you go to the repair shop, it will recheck and correct the distance between them by filling.
Note that some car errors, such as catalyst failure, can be fixed with RAMP. Among the problems that can be seen in some new cars is the occurrence of some false errors. These errors are generally caused by the use of low-quality gasoline, which can be solved with the help of a ramp.
Engine adjustment steps
1) the spark system
The first task is to check the ignition system, which includes spark plugs, wires, and coils.
You should check if there is rot, dryness and cracking or if they are worn somewhere. In fact, you look at the general condition of the wires, if there is no problem, you do not replace them. One of the most important signs of wire failure is electricity theft, which causes thin black lines to fall on the porcelain body of the candle.
Now you go to the candle. In fact, it is recommended to replace the ignition system components every 30,000 kilometers. However, car technicians visually check the spark plugs to see if they are usable or not and replace them if needed. Signs such as spark plug chattering or spark plug electrode corrosion are easy to recognize.
2) The fuel system
Cleanliness and washing of the fuel system is another important thing. If you personally want to clean the injectors of your car, you can use special additives that are sold in the market and are poured into the tank, but note that the price of an original additive is not less than 150 thousand Tomans. And other supplements available in the market, especially gas stations, are not of good quality.
The best way to service the fuel system is to use an injector cleaning device called an ultrasonic injector washing machine. To perform this service, the injector needles are removed from the car and connected to the injector washing machine.
When the machine starts working, you can check the fuel injection rate of each needle. Then, after this step, an ultrasonic bath is used, which separates the particles inside the needles from the internal passages of the needle with ultrasonic waves. Due to the poor quality of fuel in Iran, most of the time, particles accumulate in the path of the injector needle and prevent fuel injection. The appropriate amount of the needle is injected. For this reason, it is recommended to fill with fuel before the fuel light comes on. In order to prevent both the pressure and burning of the fuel pump and the occurrence of this problem.
And it is necessary to remind that the most important thing that prevents the injector needles from getting dirty is replacing the fuel filter on time or earlier. It is for cities with little traffic.
Warning: After every injector washing service, it is necessary to replace the o-rings of these parts.
3) Airlines system
Remember that when replacing car consumables such as air and gasoline filters, the operating hours of the car should also be taken into account. For example, traffic or running the car on the spot lead to earlier depreciation of these filters. It is recommended to change the air filter every 6,000 km in cities like Tehran. Although there are filters that are reusable, some of the sports air filters that are sold recently are washable.
The second issue is about the service of the ventilation system, washing the gas valve. As you can see in the picture below, over time, due to oil vapor entering the gas valve, this part becomes dirty. Considering that the use of electric gas valves has increased in recent years, do not forget that the dirtiness of this part is more harmful. In normal cars, cleaning the duct of the stepper motor can also be effective in increasing the life of this part.
Investigating the motor output smoke color and connecting with engine adjustment
1- White smoke
In winter, when the weather is cold, white smoke comes out of the car due to the presence of small dews that have accumulated on the piston head due to the cold, and when the car starts, the water particles turn into gas due to the heat and from the exhaust. they're going out. which leaves the exhaust in the form of water vapor and water droplets. But after warming up the car, there is no more white smoke, which is normal.
But there is another factor that when you start your car, it turns on late and white smoke comes out of your car's exhaust more than usual. In this case, there is a possibility of burning your cylinder head gasket, which you should refer to a car technician.
2- Blue smoke
Blue smoke coming out of the car exhaust for any reason indicates a defect in the mechanical performance of the engine. This depends on many factors. For example: the piston ring of the engine is weakened, the sealing gate of the valve is oiled and...; Therefore, to fix the blue smoke, the engine needs to be repaired.
Note: The emission of blue smoke from turbocharged engines can also be due to the failure of the central shaft of the turbocharged part.
