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.
Fuel Injected
The ignition system on fuel injection systems, is composed of battery, ignition coil, distributor, spark plugs, fuel injection control unit and wires. The crank angle sensor, built into distributor, detects reference crank angle and positioned crank angle.
Electronic signal of both angles is transmitted to control unit which is used in common with fuel injection systems. The control unit calculates spark advance angle and determines spark timing.
The electronic signal of spark timing determined by the control unit is transmitted to power transistor. It makes a primary circuit to the ignition coil and high voltage current is generated in secondary circuit.
High voltage of secondary circuit is distributed to spark plug of each cylinder and discharged there. Spark advance angle is calculated from following 3 factors: engine speed compensation, advance when starting engine, and advance in all driving conditions except engine starting. See Figure .
NO RELATED
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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.