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.
Computer Controlled Catalytic Converter System C-4: Operation: Carburetors
Carburetors used in conjunction with the C-4 system are designed with an electrically operated solenoid in the fuel bowl. In the Rochester E2ME, E4ME and E4MC carburetors this solenoid controls position of metering rods in main fuel jets. In the Rochester E2SE carburetor this solenoid provides a controlled restriction to the main metering system. This solenoid responds to impulses (cycles) generated from the ECM to make the mixture leaner or richer, as determined by the system of engine senors and switches.
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Use the Manual With the Right Hardware
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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.