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.
Electronic Fuel Injection: Operation: General
The Electronic Fuel Injection system is unique in that it actually measures the volume of both fuel and air entering the engine. The air flow meter measures the volume of air entering the air cleaner, and the computer signals the control motor to add enough fuel to achieve the desired 14.7:1 air/fuel ratio. Finally, the oxygen sensor and other engine sensors help the computer to fine-tune the mixture to accommodate various driving conditions that require a richer or leaner mixture.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.