If one or more glow plugs have burned out, are carbon fouled or damaged, the engine will become progressively harder to start as temperatures drop and will idle roughly and produce white smoke from the exhaust for several minutes once it finally starts. If the glow plugs are faulty, the engine chamber will not reach the required temperatures. It needs to reach at least 450° F / 232° C for ignition to take place. The combustion chamber heat comes from compression pressure and glow plug heat. Misfires can be caused by issues with fuel quality, compression and fuel injection. This ignites the diesel fuel, resulting in combustion. The combustion process in diesel engines requires a high rate of compression, fuel injected at the correct time and in the correct amount. If there are no problems with the fuel or the battery, then glow plugs should be checked. In cold conditions, without correctly functioning glow plugs, the combustion chamber may not reach the right temperature to ignite the fuel and start the engine. A number of faults can cause the engine warning light to illuminate – below, we outline the clues which point to faulty glow plugs.Ī hard starting engine is the most common indicator of damaged glow plugs. Vehicles displaying this light should be taken to an authorised workshop for proper diagnosis and service as soon as possible. The engine warning light on the dashboard is often the first clue that something is wrong. Something’s wrong: the engine warning light
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