Molly Ayala
If you're looking to install an electric choke on your manual carburettor, there are a few steps you need to follow. First, you'll need to remove the manual choke plate and install the electric choke cap. You'll then need to connect the wires to the carburettor – one to a ground and the other to a source of 12V fused power. You can also run the choke wire to your windshield wiper hot wire. It's important to note that you should not connect the choke wire to the coil or the starter solenoid, as this can cause issues with the ignition system. Instead, you should connect it to the stator output of the alternator, which only produces electricity when the engine is running.
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What You'll Learn
Electric choke conversion kits
The process of installing an electric choke conversion kit typically involves removing the manual choke plate and replacing it with the new electric choke. The choke housing is secured to the carburetor at the same three attachment points used for the manual choke plate. It is important to ensure that the metal tab on the housing fits into the loop on the wound spring in the choke cap, as this allows the choke plate to open and close. A metal retaining ring is then used to hold the choke cap in place, with the ring installed so that it bows outward.
The electric choke will require a power source, and it is recommended to use a source that is only powered when the ignition is on but not when the key is off or cranking. One way to achieve this is by routing the power through an oil pressure switch, which will block voltage to the choke when the engine has no oil pressure. Another consideration is to use a fuse block with a wire of at least 14-gauge wire thickness, running from the terminal marked IGN to the tab on the plastic choke body.
It is important to note that not all components in the conversion kit will be needed for every conversion, and some adjustments may be necessary. For example, the fast idle lever assembly may need to be removed and reused, and a new gasket with a hole for airflow may be included in the kit. Overall, upgrading to an electric choke can make your life easier and improve the performance of your vehicle, especially in cold weather conditions.
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Hooking up the wires
To hook up the wires of an electric choke carb, you need to connect the choke wire to a 12V power source. This power source should only be live when the engine is running, and not when the key is off or when the engine is cranking.
The choke wire should be connected to the stator output of the alternator, which is marked as "S" or "STA". This ensures that the choke only receives power when the engine is running.
Some people suggest connecting the choke wire to the starter solenoid or the coil, but this is not recommended as it can cause issues with the ignition system and the choke may open when the engine is not running.
It is also important to ensure that the choke is grounded properly. The black wire should be connected to a ground source, while the red wire should be connected to the 12V power source.
Additionally, it is suggested to route the power through an oil pressure switch to block voltage to the choke when the engine has no oil pressure. This adds a layer of safety to the system.
Overall, the key points to consider when hooking up the wires of an electric choke carb are connecting the choke wire to a switched 12V source, grounding the black wire properly, and ensuring that the power is routed through an oil pressure switch for added safety.
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The choke housing
Inside the choke housing, the metal tab protruding from the housing must fit into the loop on the wound spring within the choke cap. This tab engages with the spring to control the opening and closing of the choke plate. A metal retaining ring is then used to secure the choke cap to the choke body, utilizing spring pressure to hold the cap securely in place.
When installing an electric choke conversion kit, it is essential to connect the electric choke wires to a "key-on" power source in the fuse box. This ensures that the choke only receives power when the ignition is turned on, preventing battery drain when the vehicle is not in use.
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The choke rod
In manual choke systems, the choke rod is typically linked to a choke lever or cable that the driver operates manually. By adjusting the choke rod's position, the airflow through the carburettor can be controlled, allowing for a richer or leaner fuel mixture as needed during different engine operating conditions.
In electric choke systems, the choke rod is still connected to the choke shaft, but its movement is now controlled by an electric actuator or solenoid. This actuator is typically connected to the vehicle's electrical system and receives signals from the engine control unit or a temperature sensor. When the engine is cold, the actuator positions the choke rod to provide a richer fuel mixture for easier starting. As the engine warms up, the actuator gradually adjusts the choke rod to open the choke and return the fuel mixture to normal operating conditions.
Overall, the choke rod plays a crucial role in the carburettor's choke mechanism, whether manual or electric. By controlling the choke plate's position, it helps regulate the air and fuel mixture, ensuring the engine starts and runs smoothly across a wide range of operating conditions.
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Where to hook up the choke wire
When hooking up an electric choke carb, it is important to ensure that the choke only has power when the engine is running. The choke should not have power when the key is off, when the engine is cranking, or if the engine stalls.
To achieve this, the power must be routed through an oil pressure switch with three terminals. One terminal operates the oil pressure light on the dashboard, while the other two terminals are connected when oil pressure is detected. This ensures that the oil pressure switch blocks the voltage to the choke when there is no oil pressure in the engine.
When wiring the electric choke, it is recommended to use at least a 14-gauge wire. Run a wire from the fuse block, specifically the terminal marked "IGN", to the tab on the plastic choke body. The black wire should be connected to the ground, while the red wire should be connected to a source of 12V fused power that is activated when the ignition is turned on.
For the ground connection, you can run the wire to the battery ground wire attached to the alternator bracket, which is typically located close to the choke. It is important to ensure that the power source is only active when the key is turned to the "Run" position and not in any other position.
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Frequently asked questions
An electric choke carb is an alternative to a manual choke, which can be found in older vehicles. It can get your carbureted vehicle up and running with minimal fuss, even on cold mornings.
You will need to use an electric choke conversion kit. First, remove the manual choke plate by unscrewing it. Then, install the electric choke cap, ensuring the metal tab fits into the loop on the wound spring. Check that the tab is in place by rotating the choke cap.
One wire should be grounded to the body of the carb. The other wire should be hooked up to a switched 12-volt source, such as the starter solenoid or the stator output of the alternator.
You will be stealing power from the ignition system, which can cause issues. The choke will also open even if the engine is not running.
The choke may not open fully, or at all. You may also experience coil issues if there are voltage drops to or through your ignition switch.
