Glow plugs are the engine management component which is found on vehicles which are equipped with diesel engines. Their main purpose is to help warm up the engine’s cylinders so that the diesel combustion can be occurred more easily. These plugs play an important part especially in warming the vehicle’s cylinders during cold starts, where starting the engine is the most difficult task.
During the functioning, glow plugs use an electrode which warms up and glow orange when the current is applied. When these plugs deal with an issue, they usually cause problems with the drivability of the vehicle. There are certain set of symptoms which alert the driver that their glow plugs have gone bad or are failing. These symptoms are listed below:
1. Engine misfires or decrease in power and acceleration
Misfiring of the engine is one of the very first symptom which a driver is tend to experience. If the glow plugs malfunction, then they will not provide any additional heat which aids in the diesel combustion. This may result in the engine misfires. These misfires may then affect the vehicle with a loss in power, acceleration and even fuel efficiency.
2. Hard starting
Another symptom which the driver might face is the hard starting. Unlike the petrol engines which use a spark to ignite the fuel mixture, diesel engines solely rely on the cylinder pressures to ignite the diesel fuel mixture. If the glow plugs present in your engine fail, then the engine will have to overcome additional pressure in order to ignite the mixture. This will result in hard starting.
3. Black smoke from the exhaust
Another symptom which tends to be coming in front of the driver is the black smoke from the exhaust. Faulty glow plugs might disturb the sensitive diesel combustion process, which causes the engine to produce a black smoke from the tailpipe. This black smoke can also be caused by a wide variety of other issues. In order to avoid this, the engine must be properly diagnosed during routine check-ups.