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.
Computerized Emission Control (CEC) System: Description
The Computerized Emission Control (CEC) system is used on all 258" 6 cylinder engines (except Eagle). This system consists of a Micro Computer Unit (MCU), an oxygen sensor, a ported vacuum switch, 2 manifold vacuum switches, a coolant temperature sensor and a catalytic converter. This system is used in conjunction with the Carter model BBD carburetor equipped with electronically controlled main metering air bleeds. See FUEL SYSTEMS section.
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.