Regan Brown
The Chevrolet S-10 is a compact pickup truck that was released in 1982 and has since become a popular choice for modifications and custom builds. While the S-10 is known for its reliability, some owners may experience issues with the fuel system, particularly with the fuel injectors or carburetor. Converting the fuel delivery system from a carburetor to fuel injectors can be a complex process, requiring a range of replacement parts and technical expertise. This guide will provide an overview of the conversion process, including the necessary parts and steps to ensure a successful and safe modification.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Carburetor Conversion Kit | Holley Carb |
| Fuel Consumption | Carbs use less fuel than injection or TBI units |
| Fuel Regulator | Can be put inline and the stock pump can be used |
| Back Pressure | A lower pressure regulator will cause less back pressure to the pump |
| Manifold | Will not work without the correct high-performance head |
| Throttle Body Injection | Not the same as EFI |
| Cost | Intake, carb, distributor, and coil for just over $1050 |
| Fuel Injector Cleaner | Can be added to the gas tank to unclog jets |
| Carb Cleaner | Can be sprayed into the carb |
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What You'll Learn
Fuel efficiency and engine performance
Carburettors rely on air flowing over liquid fuel, gathering fuel vapours for ignition. While they can deliver impressive peak horsepower numbers, they often fall short when it comes to optimising fuel delivery for various driving conditions. Additionally, carburettors can struggle to provide the right amount of fuel, especially when compared to the precision of fuel injection systems.
Fuel injection systems, on the other hand, offer superior control over fuel delivery. They utilise a computer, an oxygen sensor, and fuel injectors to maintain the ideal air/fuel mixture, known as the stoichiometric ratio. This ratio is crucial for the catalytic converter to function at its maximum efficiency. The computer adjusts the duration of fuel injector openings to achieve this ideal ratio, resulting in improved fuel efficiency.
Furthermore, fuel injection systems excel in dynamic driving conditions, such as corner exits, where carburettors often fall short. The fine-tuned adjustments provided by the computerised system allow for precise control over ignition timing, temperature, barometric pressure, engine load, and other parameters. This level of detail ensures that the engine consistently receives the right amount of fuel, enhancing performance and fuel efficiency.
While carburettors have their advantages, such as lower fuel consumption in certain scenarios, fuel injection systems offer overall improvements in fuel economy, power, and emissions. Modern engines benefit from longer lifespans due to the ability of fuel injection systems to automatically correct the air/fuel ratio, preventing issues like carbon build-up, spark plug damage, and increased compression.
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Carburetor conversion kit
The 1991 Chevrolet S10 pickup truck is equipped with a 2.5 throttle body and a 4.3L V6 engine. While it is possible to convert the fuel injection system to a carburetor, it is a complex process that requires significant modifications to the engine and may not be suitable for those without mechanical expertise.
To convert the fuel injection system to a carburetor, you will need a conversion kit that includes the necessary parts and hardware. The kit should include a rebuilt carburetor, an adapter plate to mount the carburetor to the intake manifold, a new or rebuilt distributor, an air filter and housing, and any other required hardware. Some sources suggest using a Rochester 1-barrel carburetor from a Chevy 235 straight-six, while others recommend a Weber 32/36 DGV progressive downdraft 2-barrel carburetor.
Additionally, you will need to address the fuel delivery system, as the stock electric fuel pump in the gas tank may not be compatible with a carburetor. One option is to install a lower-pressure regulator inline with the stock pump to reduce back pressure and prevent premature failure. However, some users have questioned whether the manifold will work without a high-performance head.
It is important to note that converting to a carburetor may impact fuel consumption. Carbureted engines are generally less fuel-efficient than fuel-injected engines, and proper tuning and maintenance are required to optimize fuel economy.
Finally, the conversion process will require modifications to the engine's computer controls. The stock ECU may need to be replaced or modified to work with the carburetor, and the wiring harness may need adjustments to accommodate the changes.
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Throttle-body fuel injection
Converting a 91 Chevrolet S10 Carburetor to Throttle-Body Fuel Injection
The 1991 Chevrolet S10 was offered with a 4.3L engine that could be equipped with either a carburetor or throttle-body fuel injection (TBI). TBI systems were common in the late 1980s and early 1990s and are considered a step up from carburetors. They served as a segue between carburetion and multiport fuel injection.
How Throttle-Body Fuel Injection Works
The throttle body controls airflow to the engine, while the injectors control fuel flow. A computer, often referred to as the powertrain control module (PCM), activates the TBI injectors. The injectors spray fuel into the throttle body bore, and the fuel pressure regulator routes excess fuel back to the fuel tank to control fuel pressure.
Converting to Throttle-Body Fuel Injection
You can update an engine’s fuel system from a carburetor to throttle-body fuel injection using a fuel injection conversion kit. These kits typically use TBI and can be purchased from trusted manufacturers. However, it is recommended to consult a professional mechanic before making any modifications to your vehicle.
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Electronic fuel injection
Working of EFI systems
An EFI system replaces a carburetor in a gasoline engine. Carburetors introduce fuel to the airstream, which flows into the engine as the air is accelerated through a venturi tube. While a carburetor can be made to function well, EFI offers many advantages. An EFI system uses a nozzle, or injector, to deliver a mist of pressurized fuel to the engine, either into the airstream flowing into the engine or directly into the cylinder. The injector is located in the combustion chamber, inlet manifold, or, less commonly, the throttle body.
The injectors are controlled by an Engine Control Module (ECM), a compact computer that gathers data from sensors that monitor the oxygen level of the exhaust, the coolant temperature, the throttle position, engine RPM, and environmental factors such as air temperature and barometric pressure. The ECM then adjusts fuel delivery and engine spark timing to achieve optimal performance.
Converting a 91 Chevrolet S10 Carburetor to EFI
The 1991 Chevrolet S10 pickup truck with a 2WD V6 4.3L engine can face issues with fuel delivery through the throttle body. It is possible that the jets are clogged, and a "Fuel Injector Cleaner" can be used to address this issue.
In 1985, the 4.3L engine was equipped with either throttle-body fuel injection (RPO LB4) or a Rochester Quadrajet 4-Barrel carburetor (RPO LB1). The LB4 fuel injection system was rated at 130 hp (97 kW) and used in Chevrolet full-size sedans and the El Camino, while the LB1 carbureted version was rated at 155 hp (116 kW) and used in pick-ups and vans.
It is important to note that converting a carbureted engine to EFI can be a complex process and may require additional modifications to the engine, fuel system, and electronics. It is recommended to consult a professional or seek advice from experienced individuals before attempting any modifications.
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Fuel injector replacement
While fuel injectors are built to last for over a decade, they may need to be replaced if they wear out or become clogged. Here is a step-by-step guide on how to replace the fuel injectors in your 1991 Chevrolet S-10:
Step 1: Start with a cold engine
Before beginning any work on your vehicle, make sure the engine is cold. This is important for safety reasons, as a hot engine can cause severe burns.
Step 2: Disconnect the battery
Disconnect the battery to disable the power to the ignition and fuel system. This is an important safety precaution to prevent any accidental starting of the engine during the replacement process.
Step 3: Remove the engine covers
Use the appropriate socket to remove the plastic engine covers. Set them aside in a safe place so they don't get damaged or lost.
Step 4: Disconnect the electrical connectors
Use pliers to carefully disconnect the electrical connector on each injector. This will allow you to remove the fuel rail and injectors.
Step 5: Remove the fuel rail
The metal rod over the fuel injectors is the fuel rail. Loosen any bolts or brackets holding the fuel rail in place and remove it. Depending on your model, you may need to disconnect the fuel line from the fuel rail first. Be careful not to bend or deform the fuel rail during this process.
Step 6: Remove the old fuel injectors
Gently wiggle and pull out the old fuel injectors. You may need to use a small flathead screwdriver to remove any metal clips holding the injectors in place. Have some shop towels ready, as the injectors and rail will drip.
Step 7: Clean the throttle body and ports
Before installing the new fuel injectors, it is important to clean the throttle body and injector ports. Use a non-abrasive cleaner and wipe them with a lint-free cloth.
Step 8: Prepare the new fuel injectors
Dip the tip of each new injector into a small amount of engine oil or gasoline. This will wet the seals and prevent leaks. If your new injectors did not come with seals, be sure to purchase new injector seals rather than reusing the old ones.
Step 9: Install the new fuel injectors
Gently slide the new injectors into their slots on the fuel rail. Make sure they are installed in the same orientation as the old injectors. If your injectors have metal clips, make sure to attach them securely.
Step 10: Reinstall the fuel rail
Carefully line up the injectors with their respective holes on the engine. Press each injector until they slide into place and bolt down the fuel rail. Reattach the fuel line if it was disconnected.
Step 11: Reconnect the battery and electrical connectors
Reconnect the battery and turn the key to the "on" position. Wait 10 seconds before attempting to start the engine. This will allow the fuel pump to refill the lines and fuel rails.
Step 12: Start the engine and monitor
After the engine starts, monitor the dash for any engine lights or unusual behaviour. If the engine light comes on, there may be an issue with the fuel system or an electrical problem. You may need to seek professional help to diagnose and resolve the issue.
Note: It is recommended to replace the fuel injectors with original manufacturer equipment (OEM). Aftermarket fuel injectors may not perform as expected and could have incompatible electrical connections.
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