Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Performance - Functional Description: Ignition: Notes
The engine features an inductive ignition system with static ignition distribution.
The ignition circuit consists of the following components:
- Ignition coil with primary and secondary coil
- Ignition output stage in the Digital Motor Electronics (DME) for controlling the current via the primary coil
- Spark plug which is connected to the secondary coil.
Each spark plug is activated by a high voltage from a separate ignition coil (pencil ignition coil) that is inserted directly into the cylinder head cover and activates a separate ignition output stage in the Digital Motor Electronics (DME). The ignition coils use the vehicle voltage to generate this high voltage that ignites the fuel-air mixture in the combustion chambers.
The point at which the ignition spark ignites the fuel-air mixture must be set so as to ensure optimum torque, low fuel consumption and minimum pollutant emissions. The essential variables are:
- Engine speed
- Engine torque
- Air ratio value
- Coolant temperature
- Intake air temperature.
These values are recorded by sensors, processed by the Digital Engine Electronics (DME), digitalized and output as a signal for the ignition output stages.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.