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 Injectors
The PCM controls fuel injector "on" time (pulse width) to meter fuel quantity into the intake ports. The PCM receives inputs from several engine sensors to compute fuel flow necessary to maintain correct air/fuel operation throughout engine operating range.
Each cylinder has a solenoid-operated injector that sprays fuel toward each intake valve. Each injector receives battery voltage from the main relay. A PCM-controlled ground circuit is used to complete the circuit and energize the injector. Fuel injectors "fire" sequentially (in engine firing order) once per complete cycle.
Injectors consist of solenoid-actuated pintle and needle valve assembly. The amount of fuel delivered to the engine is regulated by length of time the solenoid is energized (pulse width). The atomized spray pattern is obtained by the shape of the injector pintle.
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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.