Car engine ignition system Ford Fiesta 4

General information about the ignition system
The ignition system is designed to ignite the air-fuel mixture in each cylinder at exactly the right time. In gasoline engines, this is achieved by an electric spark...

Electronic control unit
Due to the use of an electronic digital ignition system, ignition timing adjustment is not required. The memory of the control unit stores programs and setting data. The...

Ignition timing adjustment
According to load condition (idle, part load, full load) and air quality, the fuel mixture burns from the combustion chambers at different speeds. In order to use the...

Ignition coil
For a spark to occur, the voltage between the electrodes of the spark plug must rise sharply from 0 to 30,000 V. However, the battery voltage is 12 V, so this low...

Spark plug
Pic. 9.4. Spark plug: 1 and 2 - threaded lugs for connecting a high-voltage wire; 3 - ceramic insulator with a barrier to exclude surface leakage current; 4 - rod; 5 –...

Every 45,000 km — removal, inspection and replacement of spark plugs
In terms of maintenance, Ford requires the replacement of spark plugs every 45,000 km (45,000 km). But if your Fiesta is reluctant to start or jerks after starting, the...

Temporarily changing the ignition timing to correct the octane number of the fuel
Pic. 9.7. The location of the temporary change in the ignition timing connector for adjusting the octane number of the fuel If, due to necessity or carelessness, you...

Turning off the ignition, checking the ignition unit and high-voltage wires
SEQUENCE OF WORK Pic. 9.8. An arrangement of fixing brackets of fixing of an electric socket of the block of ignition 1. Squeeze the mounting brackets and disconnect the...

Checking the engine speed sensor with a universal measuring device
To check the serviceability of the crankshaft speed sensor, measure its resistance with a universal measuring device. To ensure that the distance between the sensor and...

Checking the pressure sensor
SEQUENCE OF WORK 1. Disconnect the hose from the pressure sensor and close its free end with your finger. 2. Have an assistant start the engine and keep the engine speed...

Checking the secondary voltage of the ignition system
SEQUENCE OF WORK 1. Remove any end of the high voltage wire from the spark plug and remove the spark plug. 2. Connect the high-voltage wire to the turned out spark plug...

Checking the Primary Ignition Circuit in Conventional Ignition Systems
To check, you must use a universal measuring device. Connect and disconnect the device only with the ignition off. SEQUENCE OF WORK 1. The primary winding of the...

Ignition coil resistance measurement
Reliable measurement is possible if the engine control unit is working properly. Ignition systems on 96 Series models can be tested with a multimeter in resistance test...

Removing the ignition block
SEQUENCE OF WORK 1. Disconnect a wire from the negative plug of the storage battery. 2. Disconnect tips of high-voltage wires from the block of ignition. Pic. 9.10....

Possible malfunctions of the engine and ignition system
Possible malfunctions of the engine and ignition system, their causes and methods of elimination