Diesel glow plugs to live a hard life. They are subject to extreme changes in temperature and high pressure combustion. Since a diesel engine can have up to 10 sockets, one for each cylinder, you can not notice when things go wrong. But if two, three or more go wrong, you will notice that the engine has become very difficult to start. Some vehicles PCM to monitor the operation of the glow plugs, the most appropriate to use a glow plug relay, if you do not know you have bad glow plugs.
Overview: In a diesel engine, combustion is affected by self-ignition of pulverized fuel in highly compressed and therefore heated to high temperature combustion air. In a cold engine, the autoignition temperature is not achieved by compression. A pre-glow system is necessary. System uses light before to raise the temperature of compressed air to facilitate the launching of the engine in the cold by using a candle. The duration of the pre-light depends on the engine temperature and ambient temperature. Pencil element glow plugs are essentially a box with thread and a piece of pencil stuck in the box. The single connecting bar pole stuck in the aluminum box with a round nut non-returnable.
The pencil element glow plugs are designed to flow at 12 volts and are used in parallel. On some more diesel generators, as they plug in a current of 6 volts. Resistance to the drop is used to reduce the voltage to 6 volts. After a warm-up period of nine seconds, a "Quick Start" pencil element temperature of approximately 1652 ° F is reached after 30 seconds maximum temperature amounts to 1976 ° F. Quick-Start pencil element glow plugs are usually used in cars, while trucks are using slow heater plug element. Pencil element is indirectly heated through a heating device. This heating element, one coil of a resistance wire, are integrated and isolated in a ceramic material. When the filament system is activated, each candle is covered by a flow of about 20 amps peak pulse of about 40 amps. Under the influence of rising heat. Increases resistance inherent glow plug and limit the current to approximately 8 amps.
Design Element pencil glow plugs not only resistance, design, Quick-Start program, part of the rod is the same pen from the pen of the candle. Resistance is the heating and control coil connected in series. When the filament system is on, each candle is made of about 30 amperes of current. plugs is heated very rapidly heating coil. Increasing the temperature control to increase the coil resistance and limits the current of about 815 amperes. This protects against overloads rod.
Some Chrysler Chrysler vehicles equipped with a diesel engine option does not use glow plugs, they use an intake manifold air heater grid to heat the air entering the cylinders. The instrument cluster is waiting to light the lamp. Waiting for the light the lamp gives an indication that the conditions for the simplest starting the diesel engine has not yet been reached. The Powertrain Control Module (PCM) illuminates the lamp waiting to start in the dashboard ignition switch is turned on after the ON position. One side of the bulb waiting to start receiving power from the battery when the ignition switch is placed in position. PCM switches the connection to the land on the other side of the bulb is based on multiple inputs and internal planning.