ML350 CDI V6 BlueEfficiency
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£6,490
- Year/Month: 2011/0
- Stock ID: T120709
- Transmission: Automatic
- CC: 3000
- Mileage: 172000
- Fuel Type: Diesel
- 83 Views
The injectors have the task of injecting the exact quantity of fuel calculated by the control unit at each operating condition of the engine. To ensure good atomization of the fuel in Mercedes Benz m class CDI for sale with reduced condensate losses it is necessary to respect a specific distance and an injection angle specific to the engine.
Open And Close
The injectors are operated electromagnetically. The control unit calculates and manages the electrical impulses for the opening and closing of the injectors based on the current sensor data of the engine operating conditions. The injectors consist of a special body, which houses a magnet winding and a guide for the nozzle needle with magnetic armor. If the control unit powers the magnet winding with tension, the needle leaves its seat to drill a precision hole. when the voltage supply ends, the needle returns to a position pushed by a spring, thus closing the hole. The flow rate with an open injector is well defined by the precision bore. To inject the fuel quantity calculated for the operating conditions, the control unit calculates the injector opening time with respect to the flow rate. This ensures that the correct amount of fuel is always injected. The structure of the injector seat and the precision hole allow the optimal atomization of the fuel to be obtained.
Control Unit
A defective or incorrectly functioning injector can cause failures such as Start-up problems, Increased fuel consumption, Power loss, Minimum oscillation and Poor exhaust gas behavior. While the Possible consequential damage could be the Reduction of the useful life of the engine, Catalyst damage and particulate filter. Besides, possible causes of a defect or limited operation are described as: an injector mesh filter clogged with soiled fuel, a defective closure of the needle valve due to tiny impurities from the inside, combustion residues from the outside, additive deposits, a blocked drain hole, a short circuit in the coil as well as an interruption of the control unit cable. So, there is the need to control of injection nozzles such as The combination of the comparative cylinder measurement and the exhaust gas measurement makes it possible to compare the quantity of fuel injected with the HC and CO values of the individual cylinders during the reduction in the number of revolutions.Â
Suitable Point
While, In the positive case the values are the same in all the cylinders, in the case of strongly discordant values a small quantity of fuel is probably injected. The cause is due to a faulty injector. The oscilloscope displays the injection signal. In this regard, the measuring cable is connected to the signal cable, the other cable to a suitable ground point. With the motor running, it is possible to detect the voltage and the pulse duration (opening time) on the signal. When the throttle valve is opened, the pulse duration must increase during the acceleration phase and decrease again above or just below the minimum value at a constant speed. Hence, there is a dire need to check that part when you decide to pay Mercedes Benz m class CDI price because the results of the individual cylinders can be compared with one another thus obtaining a possible response to possible failures i.e. bad voltage supply.Â
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