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.
Feedback Carburetor System: Operation: Notes
The FBC emission control system precisely controls air/fuel ratio, allowing use of a 3-way catalyst to reduce emissions. Several input sensors provide signals to the Electronic Control Module (ECM). The ECM controls various output components to maintain driveability and keep emissions low.
This system utilizes a dashboard mounted malfunction indicator light which, for some failure modes, will inform driver of need for unscheduled maintenance.
If system malfunctions, "Check Engine" light will come on and remain on as long as fault continues and engine is running. The ECM incorporates a diagnostic memory which will assist in diagnosing closed loop control system malfunction. When activated, diagnostic memory will flash a code through "Check Engine" light.
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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