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.
EFC System: Description
The Electronic Fuel Control (EFC) system is used on rear wheel drive cars. The EFC system is an electronically-controlled system that closely manages air/fuel ratio and ignition timing.
The Spark Control Computer (SCC) is the heart of the system. This computer provides the capability of igniting a lean air/fuel mixture according to different modes of engine operation. In addition, during closed loop operation, the computer maintains the air/fuel mixture close to the ideal ratio of 14.7:1.
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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.