Otis Singleton
Setting up the electric choke on a Holley carburetor can be a tricky process. The choke operation (opening and closing) can be adjusted by rotating the choke cap. The choke setting from the factory is on “index” or at the center position. If the choke comes off too late or too soon, this can be adjusted by rotating the cap in either direction. It is important to ensure that the choke plate opens completely. A choke that comes off too late or too soon can cause issues such as black smoke from the tailpipe, stalling, or poor driveability. To set the choke, it is recommended to start with a cold engine and loosen the screws so that the cover can be turned with moderate effort. The tiny gasket that seals the passage should also be connected if an internal vacuum source is used.
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What You'll Learn
Adjusting the choke operation
If the choke is disengaging too early, rotate the cap counterclockwise one notch at a time until the choke operation is optimal. On the other hand, if the choke is disengaging too late, rotate the cap clockwise gradually until the desired result is achieved. After making these adjustments, start the engine and ensure that the choke plate opens fully.
It is important to note that the choke idle screw, which is part of the choke mechanism, can be challenging to access. Therefore, adjustments should be made with caution and precision. Additionally, when adjusting the choke operation, ensure that the gasket is in place between the choke housing and the main body of the carburettor, providing a vacuum supply to the piston.
Furthermore, before making any adjustments to the choke setting, allow the engine to cool down completely. This will ensure that the adjustments are accurate and effective. It is also recommended to set the choke when the engine is cold, as this will provide a more stable base for adjustments.
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Setting the choke cap
Firstly, it is important to note that the "out-of-the-box" settings should already be close to the desired adjustments. Fine-tuning can be done by making small changes. Before making any changes to the choke setting, ensure the engine is completely cool.
To begin adjusting the choke cap, loosen the three screws that hold the choke cap in place. This will allow you to rotate the cap. The choke setting from the factory is usually at the “index” or centre position. If the choke comes off too early, adjust the cap counterclockwise one notch at a time until the choke operation is satisfactory. Conversely, if the choke is too late, rotate the cap clockwise.
When adjusting the choke cap, be mindful of the arrow with rich/lean marks on the Choke Bi-Metal spring cover. You can turn the cap in the 'lean' direction very slightly, and there should be a notch in the plastic cover that aligns with the register in the choke bracket. This is the nominal setting point.
Additionally, ensure that the tiny gasket is in place between the choke housing and the main body of the carburettor. This will ensure that the piston gets the required vacuum supply.
Finally, after making the desired adjustments, start the engine and verify that the choke plate opens completely. A properly adjusted choke cap will ensure optimal engine performance during cold starts.
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Testing the choke voltage
Step 1: Identify the Terminals
Most Holley electric chokes have two terminals: one for voltage and the other for the ground connection. Make sure you can identify these terminals on your choke.
Step 2: Check Voltage Requirements
Check the instructions or specifications for your particular Holley choke to determine the required voltage. Typically, aftermarket Holley chokes require a full 12 volts, while factory chokes may operate with slightly less voltage, around 7 volts.
Step 3: Prepare for Testing
Ensure that your Holley choke is properly connected to the power source as per the instructions. This could be the battery, the fuse box, or the stator terminal of the alternator.
Step 4: Use a Voltmeter
To test the choke voltage, you will need a voltmeter. With the ignition turned off, connect the voltmeter to the positive terminal of the choke housing.
Step 5: Check Voltage with Ignition Off
Check the voltage reading on the voltmeter. It should display zero volts or no voltage when the ignition is off. If you read a voltage, there may be an issue with the circuit or the power source.
Step 6: Check Voltage with Ignition On
Now, turn the ignition on without starting the engine. The voltmeter reading should match the required voltage for your choke (typically 12 volts for aftermarket chokes). If the voltage is lower than expected, there may be an issue with the power source or connections.
Step 7: Test with Running Engine
Finally, start the engine and re-check the voltage. The voltage reading should remain stable and match the required voltage for your Holley choke. If the voltage drops or fluctuates, there may be a problem with the wiring or the power source.
By following these steps and testing the choke voltage, you can ensure that your Holley electric choke is receiving the correct voltage and functioning properly. If you encounter issues or voltage discrepancies, further troubleshooting may be required to identify and resolve the problem.
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Setting the choke when the engine is cold
Setting the choke on a Holley carburettor when the engine is cold involves adjusting the choke operation and choke cap rotation. Here are the steps to follow:
Firstly, ensure that the choke plate opens correctly. Before starting the engine, press the pedal once to activate the accel jets and trip the fast idle mechanism. This will cause the adjusting screw to drop, and the red plastic lever behind the choke thermal element will lock into position.
Next, adjust the choke operation by rotating the choke cap. Loosen the three screws that hold the choke cap in place, but be careful not to make it too loose, as it may fall off. Rotate the cap in the desired direction: counterclockwise to delay the choke coming off, and clockwise to make it come off sooner. The choke setting from the factory is usually at the centre position, also known as the "index" position.
After making adjustments, start the engine and observe the choke plate. It should open completely. If the choke comes off too soon, you may experience issues such as stalling, surging, backfiring, or poor vehicle driveability when the engine is cold. If the choke is releasing too late, you may notice black smoke from the tailpipe, poor driveability when cold, poor fuel efficiency, misses, or rough idling.
Fine-tuning the choke setting can be achieved by adjusting the choke idle screw. This screw is part of the choke mechanism and can be challenging to access. The Bi-Metal spring cover has arrow markings indicating rich and lean settings. Turn the cover slightly in the 'lean' direction, aiming for a notch in the plastic cover that aligns with the register in the choke bracket. From this nominal setting point, adjust by moving approximately 1/8" at a time until the desired choke response is achieved.
It is important to ensure proper vacuum supply to the choke. Check that the tiny gasket is in place between the choke housing and the main body of the carburettor. This gasket can be square and approximately 1/4 inch or slightly larger. If your carburettor uses an external vacuum source, such as a rubber hose, make sure it is connected. For internal vacuum sources, the gasket plays a crucial role in sealing the passage.
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Using a gasket
When setting up an electric choke on a Holley carburetor, it is important to ensure that a gasket is in place between the choke housing and the main body of the carburetor. This gasket, which is usually about 1/4 inch in size or slightly larger, seals the passage and ensures that the piston gets a vacuum supply.
If your carburetor uses an external vacuum source (a rubber hose) for the choke, be sure to connect it. However, if your carburetor uses an internal source, don't forget to include the gasket, as this is crucial for proper vacuum function.
One user shared their experience with setting up a Holley electric choke, mentioning that they used a square gasket that was about 1/4 inch or slightly larger. They recommended starting with the factory adjustment, with the index mark "straight up." This user also noted that the gasket was essential for a smooth idle and steady vacuum.
Another user, experiencing issues with their Holley carburetor, was advised by a Holley representative to ensure that the tiny gasket was in place between the choke housing and the main body of the carburetor. This highlights the importance of the gasket in ensuring the proper function of the electric choke.
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Frequently asked questions
Adjusting the choke settings on a Holley Carburetor is simple. First, ensure that the choke plate opens completely. Then, control the choke operation by rotating the choke cap. If the choke comes off too soon, loosen the three screws and rotate the cap counterclockwise one notch at a time. If the choke comes off too late, rotate the cap clockwise.
A choke that comes off too soon may cause stalling, surging, backfiring, stumbling, or poor vehicle driveability when the vehicle is cold. A choke that comes off too late may exhibit symptoms such as black smoke from the tailpipe, poor driveability when cold, poor gas mileage, misses, or rough idle.
If the fast idle RPM needs adjusting, shut down the engine. Then, advance the throttle to wide-open and use a 1/4” open-end wrench to turn the screw clockwise to increase the RPM or counterclockwise to decrease it.
Before making any changes to the choke setting, allow the engine to completely cool down. Ensure there is sufficient vacuum to run the choke and connect an external vacuum source if needed. Check the voltage at the choke housing and make sure the choke kit gasket is in place.
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