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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U ovom članku razmatramo šest uobičajenih znakova koji ukazuju da bi žarnice mogle biti neispravne ili oštećene.
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.
Težak start
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.
Motor ne pali
Proces sagorijevanja u dizel motorima zahtijeva visoku stopu kompresije, ubrizgavanje goriva u pravo vrijeme iu odgovarajućoj količini. Ovo zapaljuje dizel gorivo, što rezultira sagorevanjem. Preskakanje paljenja može biti uzrokovano problemima s kvalitetom goriva, kompresijom i ubrizgavanjem goriva.
Grubi rad u praznom hodu
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.
Smanjena potrošnja goriva
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.
Ako je automobil pokazao druge simptome navedene ovdje, a također počinje pokazivati smanjenu potrošnju goriva, treba ga odvesti u ovlašteni servis na ispravnu dijagnozu i servis što je prije moguće.
Bijeli dim
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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Oštećene žarnice ili neispravan upravljački modul žarnica mogu uzrokovati bijeli dim pri pokretanju motora. Postoje i mnogi drugi mogući uzroci za višak bijelog dima, uključujući nisku brzinu pokretanja motora, nisku kompresiju i zrak u sistemu za gorivo. Ako je bijeli dim i dalje vidljiv nakon što se motor zagrijao, motor može imati jednu ili više loših mlaznica, usporeno vrijeme ubrizgavanja ili istrošenu pumpu za ubrizgavanje.
Crni dim
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.
