Car engine ignition system Ford Fiesta 4

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

Electronic control unit
The use of an electronic digital ignition system eliminates the need for ignition timing adjustment. The control unit stores programs and setup data. The crankshaft...

Adjusting the ignition timing angle
Depending on the load condition (idle, partial load, full load) and the air quality, the fuel mixture burns in the combustion chambers at different speeds. In order to...

Ignition coil
To create a spark, the voltage between the spark plug electrodes must increase sharply from 0 to 30,000 V. However, the battery voltage is 12 V, so this low voltage is...

Spark plugs
Fig. 9.4. Spark plug: 1 and 2 – threaded tips for connecting the high-voltage wire; 3 – ceramic insulator with barrier to eliminate surface leakage current; 4 – rod; 5 –...

Every 45,000 km – removal, inspection and replacement of spark plugs
Ford's maintenance plan requires spark plugs to be replaced every 45,000 km (28,000 miles). But if your Fiesta is reluctant to start or jerks after starting, the spark...

Temporary change of ignition timing to adjust fuel octane number
Fig. 9.7. Location of the temporary ignition timing change connector for adjusting the octane number of the fuel If, due to necessity or carelessness, you have filled...

Turning off the ignition, checking the ignition unit and high-voltage wires
SEQUENCE OF WORKS Fig. 9.8. Location of the mounting brackets for fixing the electrical connector of the ignition unit 1. Compress the fastening brackets and disconnect...

Checking the engine crankshaft speed sensor with a universal measuring device
To check the crankshaft speed sensor for proper operation, measure its resistance with a multi-purpose measuring device. To ensure that the distance between the sensor...

Checking the pressure sensor
SEQUENCE OF WORKS 1. Disconnect the hose from the pressure sensor and close its free end with your finger. 2. The assistant should start the engine and maintain the...

Checking the secondary voltage of the ignition system
SEQUENCE OF WORKS 1. Remove any high-tension wire tip from the spark plug and unscrew the spark plug. 2. Connect the high-voltage wire to the removed spark plug and...

Checking the Primary Ignition Circuit in Conventional Ignition Systems
To check, use a universal measuring device. Connect and disconnect the device only when the ignition is off. SEQUENCE OF WORKS 1. Voltage is applied to the primary...

Measuring the resistance of the ignition coil
Reliable measurement is possible if the engine control unit is working properly. Ignition systems of 96 series models can be checked with a universal measuring device in...

Removing the ignition unit
SEQUENCE OF WORKS 1. Disconnect the cable from the negative terminal of the battery. 2. Disconnect the high-voltage wire ends from the ignition unit. Fig. 9.10. Location...

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