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dar dėl pakaitinimo du kartus iš eilės ir žvakių gadinimo (iš VIDOS):

The glowplugs are self-regulating and have built-in bimetallic thermostats. They can be activated for long periods. This increases the output of the glowplugs. This keeps engine warm-up time short and means that the glowplugs can be on longer without overheating. Normal glowplug operating temperature is approx. 1,100 °C.

Beje, iš tolesnio aprašo seka, kad ir starterio sukimo metu žvakės kaitinamos:

The four glowplug phases are:
Preheating
If the ignition is switched on when engine temperature is under +5 °C the glowplugs are activated for a period which varies with engine temperature and atmospheric pressure. The glowplug indicator lamp on the dashboard indicates that preheating is active. Preheating shuts off when the engine is turned by the starter motor.

Standby heating
After preheating standby heating is activated for up to five seconds. This corresponds to the time between the glowplug indicator lamp going out and the engine starting. This makes the engine easy to start even if it is not started as soon as the indicator light goes out.

Start heating
Start heating is activated for up to 30 seconds each time the engine is turned over by the starter motor, if engine coolant temperature (ECT) is below +30°C and engine speed (RPM) is below a given threshold. Start heating facilitates engine starting even when it is not entirely cold.

Post-heating
Post-heating starts when the starter motor stops turning the engine. Duration depends on engine temperature, engine speed (RPM) and quantity of fuel injected. Post-heating is always shut off when engine speed (RPM) exceeds 2,500 rpm, irrespective of engine temperature and quantity of fuel injected. Post-heating is always activated even if preheating has not been activated. This improves combustion which reduces noise levels, improves idling and reduces exhaust gas emissions. Post-heating also improves idling at extremely low temperatures.