Glow plugs have a long lifespan, however they do gradually deteriorate due to wear and tear. So how do you know if a set of glow plugs needs replacing?
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В тази статия разглеждаме шест често срещани признака, които показват, че подгревните свещи могат да бъдат дефектни или повредени.
Something's wrong: the engine warning light
The engine warning light on the dashboard is often the first clue that something is wrong. Vehicles displaying this light should be taken to an authorised workshop for proper diagnosis and service as soon as possible. A number of faults can cause the engine warning light to illuminate – below, we outline the clues which point to faulty glow plugs.
Трудно стартиране
A hard starting engine is the most common indicator of damaged glow plugs. 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. If there are no problems with the fuel or the battery, then glow plugs should be checked.
Неправилно запалване на двигателя
Процесът на горене в дизеловите двигатели изисква висока степен на компресия, впръскване на гориво в точното време и в правилното количество. Това запалва дизеловото гориво, което води до изгаряне. Пропуските в запалването могат да бъдат причинени от проблеми с качеството на горивото, компресията и впръскването на гориво.
Груб празен ход
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 all the glow plugs are burned at their tips, check the fuel injection timing.
Намалена горивна ефективност
Temperature and fuel usually determine fuel efficiency, not glow plug performance. However, in some cases, glow plugs do have a role to play.
Based on local climate, diesel may be blended with specific additives during the cold months to lower its freezing point. The blended fuel will most likely have a lower energy content and provide reduced fuel efficiency. Engine operating temperatures should be adjusted to ensure all the injected fuel is completely burnt. Glow plugs help to provide the additional heat in the combustion chamber.
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If the required temperature is not reached due to faulty glow plugs, the engine's performance will be weakened, and it will have to work extra hard to meet the demands of the road. The vehicle's fuel efficiency will be negatively affected.
Ако автомобилът е показал други симптоми, изброени тук, и също така започне да показва намалена горивна ефективност, трябва да бъде откаран в оторизиран сервиз за правилна диагностика и сервиз възможно най-скоро.
Бял дим
White smoke usually occurs when there is not enough heat to burn the fuel. The unburnt fuel particles travel out of the tailpipe as smoke and typically produce a rich fuel smell. It's not unusual to see white smoke from the exhaust during cold weather, until the engine has warmed up.
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Повредени подгревни свещи или дефектен модул за управление на подгревните свещи могат да причинят бял дим при стартиране на двигателя. Има и много други възможни причини за излишък на бял дим, включително ниска скорост на въртене на двигателя, ниска компресия и въздух в горивната система. Ако все още се вижда бял дим след загряване на двигателя, двигателят може да има една или повече лоши инжектори, забавяне на времето за впръскване или износена инжекционна помпа.
Черен дим
Black smoke is caused by an imbalance in the air-fuel ratio – too much fuel and not enough air. This means either too much fuel is being added to the mix or there is not enough oxygen being supplied to burn the fuel. Faulty glow plugs may disturb the sensitive diesel combustion process, which in turn might result in the engine producing black smoke from the tailpipe. This is a warning sign that something is wrong either with the glow plugs or other vital components of the combustion process.
