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
During engine start-up, warm-up operation, high load operation and deceleration, the air/fuel ratio is open loop controlled by values established previously for engine speed, throttle valve angle and coolant temperature. After engine warm-up, air/fuel ratio control is made by closed loop control, based on oxygen sensor signal. The ECU controls air/fuel mixture by controlling the Feedback Solenoid Valve (FBSV) and the Slow-Cut Solenoid Valve (SCSV) mounted on the carburetor.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.