1. Manifold Swap:
* Intake Manifold: You'll need a new intake manifold designed for a carburetor. Fuel-injected manifolds have passages for injectors and sensors, which are incompatible with a carburetor. You'll need one specifically designed for a carburetor and appropriate for your engine's configuration (e.g., single-plane, dual-plane, etc.).
2. Fuel System Replacement:
* Fuel Pump: The fuel pump in a fuel-injected system is typically high-pressure and electronically controlled. You'll need a mechanical fuel pump appropriate for a carburetor system.
* Fuel Lines and Fittings: The fuel lines and fittings will need to be completely changed to accommodate the lower pressure of a carburetor system. High-pressure fuel lines are not suitable for a carbureted setup.
* Fuel Filter: A new fuel filter compatible with the carburetor system will be needed.
* Carburetor: This is the core component. You'll need to select a carburetor appropriate for your engine's size, application, and desired performance. This choice will affect your engine’s performance significantly. Consider factors like CFM (Cubic Feet per Minute) rating.
* Fuel Bowl: Ensure you have an appropriately sized fuel bowl for your selected carburetor.
3. Distributor and Ignition System:
* Distributor: While not always necessary, it's possible that your existing distributor might be incompatible. If the engine uses a computer-controlled distributor, you might need a different one.
* Ignition Coil: Depending on your specific setup, you might need a new ignition coil designed for a non-electronic ignition system.
4. Engine Management System Removal:
* Computer/ECM (Engine Control Module): The entire electronic engine management system (ECM, sensors, wiring harness) needs to be removed. This includes all associated sensors (MAP sensor, TPS, etc.).
5. Wiring Harness Modification:
* The wiring harness will require significant modification or replacement to remove all the fuel injection related wiring.
6. Vacuum System Adjustment:
* Carburetors rely on vacuum for various functions (like the distributor advance). You'll need to ensure that proper vacuum sources are available for the new carburetor and any other vacuum-operated components.
7. Professional Tuning:
* After the conversion, a professional carburetor tuning is essential. This will involve adjusting the carburetor jets, air/fuel mixture, and other parameters to achieve optimal performance and drivability.
In short: Converting from fuel injection to a carburetor is a complex project requiring mechanical expertise. It's not a simple plug-and-play swap. Unless you have significant experience rebuilding engines and working with carburetor systems, it's strongly recommended that you seek the help of a qualified mechanic. The cost of parts and labor might make this a more expensive option than simply keeping the fuel injection system.
