26/06/2025
🔧 Basic Components of Ignition System:
1. Battery – Provides electrical power.
2. Ignition Switch – Starts the system when turned on.
3. Ignition Coil – Converts 12V battery power into high-voltage current.
4. Spark Plug – Creates a spark to ignite the air-fuel mixture.
5. Distributor (in older systems) – Sends the spark to the correct cylinder.
6. Crankshaft Position Sensor (in modern systems) – Tells the ECU when to fire the spark.
7. ECU (Engine Control Unit) – Controls timing in modern electronic systems.
⚙️ How the System Works (Step-by-Step):
1. Ignition On:
• When you turn the key or push the start button, the ignition switch activates the system.
2. Power to Coil:
• The battery sends 12 volts to the ignition coil.
3. High Voltage Creation:
• The ignition coil boosts the 12V into 15,000–45,000 volts (or more).
4. Spark Timing:
• The ECU (or distributor in older cars) determines the exact timing for the spark using signals from sensors like the crankshaft position sensor.
5. Spark Plug Fires:
• The high voltage is sent to the spark plug.
• The spark jumps across the gap at the plug tip and ignites the air-fuel mixture in the combustion chamber.
6. Power Stroke Begins:
• The explosion pushes the piston down, starting the power stroke.
7. Cycle Repeats:
• This process continues thousands of times per minute while the engine runs.
🔄 Types of Ignition Systems:
1. Conventional (Distributor-based)
2. Electronic Ignition (EI)
3. Distributor-less Ignition System (DIS)
4. Coil-on-Plug (COP) – Each cylinder has its own ignition coil and plug.
🛠️ Common Problems:
• Faulty spark plug
• Weak ignition coil
• Damaged sensor
• Worn wiring
• Dead battery
#ｅｖｅｒｙｏｎｅシ゚ AUTOtalk with Lc
