Ignition / Preheating auto parts: Glow Plugs
Glow plugs may be diagnosed both at a service station, and by yourself. This can be done with the use of various methods. For the first method, you will need a multimeter. Set the device into the resistance measurement mode. Connect one probe of the device to the output of the glow plug, and the other one - to the vehicle body. If the contact is absent, the component is faulty.
You may notice that the glow plug needs diagnostics by the following symptoms:
One of the reasons of failure is the end of the service life of the filament, which is designed for 50-60 thousand kilometers of mileage. However, if problems with the component occur at a much smaller mileage, the reason often lies in malfunction of the fuel equipment. Failure of the component may also be caused by malfunctions of the regulator or alternator, high voltage.
If an injector is fouled or worn out, a strong jet of fuel is directed at the working element of the heater. This entails loss of integrity of the heater shell, and, as a result, the filament gets damaged.
If the control relay is damaged, the glow plug gets overheated. In this case, the component shell is deformed and melts on the surface, and the filament burns out. The relay itself may be burnt out, or the wires coming from it may get broken or abraded.
The component failure may be associated with incorrect use, manufacturing defects, or poor quality of the components. Finally, the element may get damaged in case of incorrect installation due to improper tightening.
A faulty component is to be replaced. This task should be entrusted to specialists of a service station, since the material of the component is very fragile, and can easily be damaged if installed incorrectly.
To keep glow plugs in good working order, perform their routine check once in six months. The component is to be replaced after every 60 thousand km of mileage.