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 - Multi-Point: Description
The electronic fuel injection system is a pulse time, Multi Point Fuel Injection (MPFI) system. On-board Electronic Engine Control (EEC-IV) system has Electronic Control Assembly (ECA) which receives inputs from engine and vehicle sensors to compute required fuel flow rate necessary to maintain prescribed air/fuel ratio throughout entire engine operational range.
Additional airflow metering is provided on the 1.9L and 2.3L Turbo engines by a Vane Airflow (VAF) meter. The 5.0L Mass Airflow (MA) engine used in Mustangs (California and Police models) uses Mass Airflow (MA) sensor to measure the quantity of air entering the engine.
The ECA controls fuel injectors to meter fuel quantity into intake ports. Injector "on" time is the only controlled variable in fuel delivery system.
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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.