Skoda Felicia

since 1994 release

Repair and operation of the car

Skoda Felicia
+ Cars of the Skoda Felicia brand
+ Maintenance instruction
+ Routine maintenance
+ Repair of the engine
+ Cooling systems, heating
+ Power supply system
- Engine electric equipment
   + Systems of a charge and start
   + System of ignition of petrol engines
   - System of preheat of diesel engines
      General information
      Removal and installation of components of a control system of preheat
      Check of a state, removal and installation of candles of an incandescence
+ Coupling
+ Transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body and finishing of salon
+ Onboard electric equipment

System of preheat of diesel engines

General information

For the purpose of simplification of cold start diesel engines are equipped with system of preheat which compound components are four glow plugs, the control unit, the control lamp which is built in in an instrument guard and a set of a connecting electrical wiring.

Glow plugs represent the tiny heating elements placed in a metal casing.

On one end of a glow plug the probe of a working element, on another electric contact is located. Each of vortex cameras / the mouth of the cylinder is equipped with an individual glow plug. The working element of a candle is located coaxially to a stream of injectable fuel. When giving food on a candle injectable fuel heats up, reaching the optimum temperature of combustion until hit in the cylinder.

Duration of the period of preheat is defined by the system control unit which traces engine temperature according to indications of CTS and corrects time of giving of food for candles in compliance with specific conditions.

The control lamp which is built in in an instrument guard informs the driver on functioning of system. when temperature of mix, necessary for successful start of the engine, is reached, the lamp is disconnected, however food continues to move on candles during even some time. If the attempt of start during the stipulated period does not happen, candles are disconnected in order to avoid replanting of the battery and burning out of working heating elements. On some models in case of identification by the control unit of malfunction of system of preheat the control lamp continues to burn also at the working engine.

Strictly speaking, activation of system of preheat is carried out by turn of the ignition key ы situation II. However, the Felicia models are in addition equipped with system of preheat which start is made when opening and the subsequent closing of a driver's door of the car. Naturally, activation of system is made once for each start of the engine. If during some certain time after opening and closing of a driver's door of attempt of start of the engine it is not made, repeated activation of system when opening a door will not happen.

Glow plugs continue to function during up to 3 minutes after start of the engine that allows to increase efficiency of ignition of mix, to reduce the level of noise, to stabilize turns of idling and to reduce toxicity of the fulfilled gases.