Wiktor Wise
The Holley electric choke is a component of the carburettor in an engine, which controls the air/fuel mixture. An improperly adjusted electric choke can cause issues with the engine idling during cold starts. To test a Holley electric choke, you can check the voltage with a voltmeter or test lite. You should also check the wire running to the positive terminal of the choke housing and ensure it shows 12 volts when the ignition is on and zero volts when it is off. This will ensure proper voltage is reaching the heating element. Other adjustments can be made by rotating the choke cap to control the choke operation.
Characteristics and Values of Testing a Holley Electric Choke
| Characteristics | Values |
|---|---|
| Terminal Voltage | 12 volts when the ignition is on and zero volts when off |
| Ground Circuit | Checked with a voltmeter or test lite |
| Choke Housing | Should be tested with the test lite ground clip on the positive side of the battery |
| Wire Lead | Should read 12 volts at the battery |
| Choke Operation | Can be adjusted by rotating the choke cap |
| Choke Setting | Factory setting is at the "index" or center position |
| Fast Idle RPM | Can be adjusted with a 1/4” open-end wrench |
| Engine | Should be shut down if fast idle RPM is too high or low |
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What You'll Learn
Check the voltage at the terminal with a voltmeter or test lite
To check the voltage at the terminal with a voltmeter or test lite, you must first identify the choke unit's ground circuit. The meter or test lite must be grounded separately from the choke unit by connecting it to a ground source, allowing you to complete the circuit.
Reverse the test lite by placing the test lite ground clip on the positive side of the battery. Then, test the choke housing to observe whether the lite goes on. There should be a second ground terminal that is either touching the carb metal base or is arranged to accommodate a wire hookup.
When checking the voltage, you are not checking the ground circuit. Instead, you are ensuring that you are getting the correct voltage across the terminal and the strap. You should check that you are getting 12 volts when the ignition is turned on and zero volts when it is off. This test will ensure that the heating element is receiving the proper voltage.
If you are experiencing issues with your Holley electric choke, checking the voltage at the terminal is a good place to start troubleshooting. By following these steps, you can ensure that the choke is receiving the correct voltage and identify any potential issues with the ground circuit.
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Ensure the choke housing is grounded
To ensure the choke housing is grounded, you must first understand what the choke effect is. The choke effect occurs when a grounding electrode conductor is installed in a ferromagnetic raceway and not bonded at both ends. The raceway acts as an electromagnetic coil (inductor) and restricts the current flow through the grounding electrode. This is not something that is desirable, and so specific bonding requirements must be met to avoid it.
To ensure the choke housing is grounded, you must make sure that the choke housing has a wire from the ground terminal to a good ground. This wire should be connected to the choke housing and then to a ground source, such as the carb metal base. This will create a complete circuit. If you do not have a wire from the ground terminal to a good ground, the choke will not work.
The ground choke must be correctly specified and placed to satisfy safety regulations and prevent high-frequency interference currents on the ground from circumventing the choke via the housing. This is particularly important with in-line filters, which are screwed directly to the metal housing for optimal performance. The filter casing is screwed directly to the grounded metal housing, achieving low impedance and improving the interference suppression capacitor's damping properties to ground.
It is also important to note that if a ground choke is integrated into the ground cable after the filter, interference currents can bypass the choke via the metal housing of the device and the filter housing. This can be solved with a KFA power entry module, which integrates a ground choke and isolates the metal housing and the ground connection of the device from the mains ground.
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Adjust the choke cap to control the choke operation
Adjusting the choke cap is a simple way to control the choke operation on a Holley carburetor. The choke cap can be rotated to adjust the choke opening and closing. It is important to note that the ""out-of-the-box" settings are calibrated and should be suitable for most uses. However, adjustments can be made for fine-tuning.
Firstly, it is important to check the wire running to the positive terminal of the choke housing. Ensure that it shows 12 volts when the ignition is on and zero volts when it is off. This ensures that the heating element is receiving the proper voltage. Before making any adjustments, allow the engine to completely cool down.
To adjust the choke cap, first, loosen the three choke cap locking screws. Then, you can rotate the choke cap in either direction to adjust the choke operation. If the choke is opening too soon, causing a difficult start, rotate the cap counter-clockwise one notch at a time until the choke performs optimally. Conversely, if the choke is opening too late, rotate the cap clockwise. It is important not to adjust the choke cap beyond the index marks to avoid damaging the internals of the electric choke unit.
The choke operation can also be adjusted by increasing or decreasing the tension on the bottom metal choke spring. This will change how long the choke stays on, depending on the engine combination or climate. Additionally, the fast idle cam and screw adjustment control the engine rpm during a cold start-up, keeping the engine idle speed around 1500 rpm while the choke is engaged.
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Check for correct voltage at the choke housing
To check for the correct voltage at the choke housing, you will need to use a voltmeter or a test light. You will need to check the wire running to the positive terminal of the choke housing. This should be connected to a switched source and should show 12 volts when the ignition is on and zero volts when the ignition is off. This test will ensure that the correct voltage is reaching the heating element.
If you are using a test light, you will need to reverse the test light by putting the test light ground clip on the positive side of the battery and then testing the choke housing to see if the light goes on.
It is important to note that the choke is a bimetallic coil that heats up and expands as voltage is applied. Therefore, the choke will not operate properly if it is not receiving the correct voltage.
Additionally, it is worth mentioning that aftermarket chokes typically require a full 12 volts, while factory chokes can operate with slightly less voltage. However, it is always best to refer to the specific instructions provided by Holley for your particular model.
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Adjust the fast idle RPM using a 1/4” open-end wrench
Adjusting the fast idle RPM on a Holley electric choke is a simple process that can be done with a 1/4” open-end wrench. This adjustment is necessary if the fast idle RPM is too low or too high for your preferences.
Firstly, it is important to shut down the engine completely. Then, advance the throttle to wide-open, exposing the fast idle set screw located below the choke housing. This screw should be easy to spot and will be below the choke housing.
Using the 1/4” open-end wrench, make the necessary adjustments to the fast idle RPM. Turning the screw clockwise will increase the RPM, while turning it counterclockwise will decrease the RPM. It is important to make these adjustments in a controlled and gradual manner to ensure the desired RPM is achieved without going too far in either direction.
The factory setting for the fast idle RPM on a Holley electric choke is typically between 1500 and 1600 RPM. This information can be used as a reference point when making adjustments. It is also important to note that the choke operation and settings can be adjusted by rotating the choke cap. This is a separate adjustment from the fast idle RPM and can be used to fine-tune the choke's performance further.
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Frequently asked questions
If your Holley electric choke is faulty, you may experience problems with the choke engaging or disengaging at the wrong times, or not at all. This can result in a rich burn and fast idle.
First, check the wire running to the positive terminal of the choke housing. Connect it to a switched source and ensure it shows 12 volts when the ignition is on and zero volts when off.
A number of issues could be causing your Holley electric choke to malfunction, including improper adjustment, a faulty ground circuit, or a problem with the choke housing.
You can adjust the choke operation by rotating the choke cap. If the choke is disengaging too soon, loosen the three screws and rotate the cap counterclockwise. If it is disengaging too late, rotate the cap clockwise.
