What needs to be replaced when converting from EFI to carburetor?

[JadeFitz]

To convert from EFI to carburetor, you need to replace the carburetor, high-voltage ignition coil, and intake manifold. Replacing these key components will enable the conversion from EFI to carburetor. Below is relevant information about carburetors: Definition: A carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the vacuum generated by the engine's operation. Principle: As a precision mechanical device, the carburetor utilizes the kinetic energy of the incoming air stream to atomize the gasoline. Composition: The carburetor's vital role for the engine can be likened to the engine's "heart." A complete carburetor assembly should include a starting device, idle device, medium-load device, full-load device, and acceleration device.

[ONicole]

I previously modified my car, switching from fuel injection to a carburetor mainly for its simpler structure and easier maintenance. First, I had to remove the original fuel injection system, including the ECU computer, various sensors such as the oxygen sensor and throttle position sensor, as well as the high-pressure fuel pump and fuel injectors. Then, I installed a carburetor, ensuring it matched the intake manifold interface to avoid air leaks. Don’t forget to replace the entire fuel supply system of the fuel injection with a mechanical one—install a mechanical fuel pump and reroute the fuel lines. The ignition system also needs adjustments; for older cars, use a distributor with an ignition coil, while newer cars might require rewiring to simplify the complex circuitry. Finally, the carburetor’s air-fuel mixture and idle speed need tuning—poor tuning can make the car hard to start and guzzle fuel. This kind of modification suits old car enthusiasts who love tinkering, but don’t expect great performance or emissions.

[JulietteFitz]

In our auto repair shop, carburetor conversions are commonly performed on older vehicle models. The core process involves completely removing the electronic fuel injection system. Before installing the carburetor assembly, precise measurement of the intake manifold dimensions is essential. The fuel delivery system must be replaced - removing the EFI fuel pump and installing a mechanical fuel pump with new fuel lines. The ignition control system also requires modification, as the original electronic ignition module typically won't work. It needs replacement with a distributor and matching ignition coil, rewiring to eliminate unnecessary ECU harnesses. During conversion, special attention must be paid to sealing - improper installation of the carburetor base gasket can cause fuel or air leaks. When tuning, adjust the mixture screw gradually until achieving stable idle and smooth acceleration. While simplified structure is an advantage post-conversion, significantly higher fuel consumption and potential failure in emissions testing during annual inspections should be clearly communicated to vehicle owners.

[McKylie]

Converting from fuel injection to a carburetor can actually save many components. First, remove the ECU, sensors, and fuel injectors—these fuel injection parts. Installing a carburetor is key; just choose the right size to mount it on the intake manifold. Replace the high-pressure fuel pump with a mechanical one and simply connect the fuel lines. If the original car has a distributor, the ignition system doesn’t need major changes; otherwise, rewire it to fit a distributor and coil. The electrical load is greatly reduced by removing the fuel injection’s computer-controlled wiring harness. However, if the manifold ports don’t match, you’ll need to replace the intake section, which is quite a hassle. Adjust the ignition timing and tune the carburetor’s air intake. But after the conversion, fuel consumption will increase by at least 20%, and occasional starting difficulties may occur. It’s recommended for vintage car enthusiasts to proceed with caution.