Otis Singleton
The Rochester Quadrajet carburettor was first introduced in the late 1960s and has since become a popular choice for car enthusiasts and mechanics due to its performance and adaptability. While the Quadrajet carburettor is known for its reliability, some owners may encounter issues with the electric choke, which can affect engine performance and fuel efficiency. In this article, we will explore common problems with the Quadrajet's electric choke and provide step-by-step guidance on how to remove and replace it, offering solutions for a range of vehicle models and years.
Characteristics and Values Table for Removing Electric Choke from Quadrajet
| Characteristics | Values |
|---|---|
| Electric choke wiring | Connect to a 12V power source activated when the ignition is on. Use wire crimpers, electrical tape, wire connectors, wire loom, wire ties, and electrical cleaner for installation. |
| Choke operation issues | Check wiring between choke coil and ignition switch. Inspect ignition switch for damage or wear. Ensure thermostat housing is functioning. |
| Troubleshooting | Verify connections at choke coil and wiring harness for damage or corrosion. Check connection between choke coil and choke pull-off. Adjust choke pull-off during engine start. |
| Conversion | Requires replacement of carburetor or use of a conversion kit. |
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What You'll Learn
The choke wiring will be fabricated by you
Firstly, you need to ensure that you have the right tools and materials for the job. This includes wire crimpers and strippers, electrical tape, wire connectors (both male and female), a wire loom, wire ties, and electrical cleaner. These tools will help you create secure connections and protect the wiring system from damage and short circuits.
The choke wiring will require a three-terminal oil pressure switch, with one terminal being the normally-closed ground for the dash light, and the other two being normally-open "pass-through" terminals for the choke power. The power supply wire will be connected to one of these two terminals, and then the wire from the remaining terminal will be connected to the choke unit.
It is important to note that the choke wiring should be connected to a power source that is activated only when the ignition key is turned to the "on" position. This ensures that the choke does not remain closed when the engine is not running, which could lead to a rich fuel mixture and poor performance.
Additionally, when troubleshooting, it is important to carefully inspect the connections and components for any signs of damage or malfunction. By identifying and addressing any underlying issues, you can ensure efficient operation and optimal engine performance.
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The choke requires a good ground connection
To ensure a good ground connection, it is important to verify that the choke is receiving the necessary voltage. Check the connections at the choke coil and ensure they are secure. A loose or faulty connection can prevent the choke from receiving the correct voltage, resulting in poor choke operation.
If the choke is not engaging when the engine is cold, there may be a problem with the wiring. Inspect the wiring harness for any signs of damage or corrosion. Ensure that the wiring harness is correctly attached to the appropriate terminals on the carburetor.
It is also important to check the wiring between the choke coil and the ignition switch. This wiring should be intact and properly connected. Additionally, make sure the thermostat housing is functioning correctly, as a faulty thermostat can prevent the choke from opening fully.
By carefully inspecting and addressing any issues with the ground connection, you can ensure that your electric choke system operates efficiently and maintains optimal engine performance.
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The choke should get 12V power when the engine is running
The electric choke in a Quadrajet carburetor should get 12V power when the engine is running to function properly. This is because the choke needs to be heated for it to open fully, and the 12V power source provides the necessary heat. If the choke does not open fully, it can result in poor performance and fuel economy.
There are a few ways to ensure that the choke receives 12V power when the engine is running. One way is to connect the choke to the S terminal of the alternator, as this will allow the choke to start opening only when the engine is running. Another way is to use a three-terminal oil pressure switch, which can help regulate the power supply to the choke.
It is important to note that the choke should not be connected directly to the ignition switch, as this will cause the choke to open when the key is turned on, even if the engine is not running. Instead, it should be connected to a switched 12V source that is activated only when the ignition is on, such as the fuse box. Additionally, it is crucial to ensure that the choke has a good ground connection to the engine or chassis to function properly.
When troubleshooting, it is important to check the connections at the choke coil and ensure they are secure. The wiring harness should also be inspected for any signs of damage or corrosion, as a loose or faulty connection can prevent the choke from receiving the necessary voltage. By carefully inspecting the connections and components, you can ensure that your electric choke system operates efficiently and maintains optimal engine performance.
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Check the wiring between the choke coil and the ignition switch
When troubleshooting the wiring of a Quadrajet electric choke, it is important to carefully inspect the connections and components for any signs of damage or malfunction. To check the wiring between the choke coil and the ignition switch, you should ensure that the wiring is intact and properly connected.
Firstly, locate the electric choke connector on the carburetor. This connector should have two terminals labelled "B+" and "I". The "B+" terminal connects to a 12-volt power source, such as the ignition switch. The “I” terminal connects to the starter solenoid “R” terminal or a separate ignition coil terminal. It is important to ensure that the wiring connections are secure and properly insulated to prevent any electrical issues.
You can then test the electric choke by turning on the ignition switch and observing the choke plate. It should open with the key in the "ON" position and close when the engine is warmed up. If the choke does not open or close properly, there could be a problem with the wiring. Check the connections at the choke coil and ensure they are secure. Inspect the wiring harness for any signs of damage or corrosion. A loose or faulty connection can prevent the choke from receiving the necessary voltage, resulting in poor choke operation.
Additionally, make sure to inspect the ignition switch itself for any signs of wear or damage that may be affecting the choke operation. A fused, switched ignition source (other than the coil) is required to power and heat the choke. It is important to ensure that the power source is only active when the ignition is "on" and inactive when it is off or set to accessory mode.
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There is a conversion kit to go from divorced choke to electric choke
If you're looking to convert your automatic choke to an electric choke, there are conversion kits available that provide everything you need, including instructions. These kits allow you to convert your divorced choke to an electric choke, and they are offered by vendors such as Carb Junkys, Quadrajetparts.com, and Carbs Unlimited.
When considering a conversion, it's important to ensure compatibility with your specific carburetor. For example, the Carb Junkys kit requires an early-style slotted lever, which some carburetors may not have. In such cases, modifications may be necessary, such as replacing the secondary air valve shaft with an early model shaft and slotted lever. Edelbrock also offers a mounting plate for the choke coil and a longer choke rod, which may be required for certain setups.
When installing an electric choke, it is crucial to pay attention to the wiring. The electric choke should be connected to a 12V power source that is activated only when the ignition is turned on. This can be achieved by connecting to the fuse panel or the "+" side of the coil. Ensuring a good ground connection is also essential, which can be done by connecting the choke housing to a suitable ground point on the engine or chassis.
Additionally, when wiring, it is recommended to use tools like wire crimpers and strippers, electrical tape, wire connectors, wire loom, wire ties, and electrical cleaner to ensure secure connections and protect the wires. Troubleshooting tips include checking the connections at the choke coil and inspecting the wiring harness for any damage or corrosion.
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Frequently asked questions
You will need to replace your carb with one that has an electric choke on it as the non-electric quadrajet does not have the mounting holes to swap it to an electric choke.
You will need wire crimpers and strippers, electrical tape, wire connectors, wire looms, wire ties, and an electrical cleaner.
If the choke is not operating properly or is not engaging when the engine is cold, there could be a problem with the wiring. Check the connections at the choke coil and ensure they are secure.
The electric choke needs to be connected to a power source that is activated only when the ignition key is turned to the “on” position. This prevents the choke from staying closed when the engine is not running. The choke wiring will be fabricated by you, with the power supply wire going to one of the two terminals.
