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 Injection System - DFI: Description
The Digital Fuel Injection (DFI) system uses a speed/density fuel system which accurately controls air/fuel mixture providing maximum engine performance, while minimizing exhaust emissions.
The system consists of fuel delivery, air induction, data sensors, Electronic Control Module (ECM), Idle Speed Control (ISC), and system diagnostics.
The ECM, an on-board computer, monitors engine operations and environmental conditions. Fuel is supplied to engine through 2 electronically pulsed (timed) injector valves located in throttle body. The ECM controls amount of fuel metered through injector valves based upon engine demand (sensor input).
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.
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