Trystan Casey
Electric chokes are designed to make starting an engine easier. They work by heating up a bi-metal coil, which then unwinds and allows current to flow to the spring coil. This process is used in cold weather to give the engine extra time to warm up. However, electric chokes are known to be inaccurate, as they are controlled by a timer. When the engine is warm, the choke is not needed, and the engine can be started with one press of the gas pedal.
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What You'll Learn
- Electric choke operation: the choke is closed when the ignition is off
- The choke opens when the ignition is on and stays open as long as the current is maintained
- The choke goes back to the choked position when it cools off
- The choke should be closed when cold, and open after a few minutes of driving
- The choke should be fully open within 3-5 minutes of a cold start
Electric choke operation: the choke is closed when the ignition is off
The electric choke is a component of an engine that restricts the air supply to the engine when it is cold. It is aptly named as it chokes or constricts the air supply to the engine. This mechanism is crucial when dealing with a cold engine, especially on cold mornings when the engine is yet to warm up.
Electric choke operation is dependent on the flow of current through the electric choke circuit. When the ignition is off, no current flows through the circuit, and the choke is in the closed or "choked" position. In this state, the choke restricts the air supply to the engine. When the ignition is turned on, the electric choke circuit becomes energised, and the bi-metal feature begins to heat up. This causes the choke to gradually open from the closed position, allowing more air to enter the engine.
The choke will remain open as long as the current is maintained. However, if the engine is shut down, the choke will eventually cool off and return to the closed position. This process can take around 20 minutes, and restarting the engine during this time may cause a "flooded" condition. To avoid this issue, it is recommended to turn the key on and wait for a minute before cranking the engine, allowing the choke to open and ensuring a smooth start.
It is important to note that the choke should be opened gradually as the engine warms up to maintain optimal engine performance and fuel efficiency. A faulty choke that remains closed or partially closed when the engine is warm can lead to increased fuel consumption and higher running costs. Therefore, understanding the operation of the electric choke and ensuring it functions properly are essential for optimal engine performance.
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The choke opens when the ignition is on and stays open as long as the current is maintained
The choke on an engine is designed to restrict the flow of air into the engine, thereby enriching the fuel-air mixture and aiding the engine to start in cold conditions. Electric chokes are designed to automate this process, and they work off a timer.
When the ignition is on, the choke opens and stays open as long as the current is maintained. This is because, with the ignition on, there is a constant 12V flow to the choke's heat-sensitive spring, which pulls the butterfly valve open. The choke will remain open as long as the current is maintained. This is true of both manual and electric chokes, although the latter operates on a timer.
When the ignition is turned off, the choke will return to the closed or 'choked' position as the current flow is cut off. This is the default position of the choke when the ignition is off. It is important to note that the choke should be closed when the engine is cold and open after a few minutes of driving, once the engine has warmed up.
The electric choke's timer can sometimes be inaccurate, causing the choke to come off too soon or choke the engine when it is not needed. This can be a problem when the engine is still cold, as the choke may not be providing the necessary restriction to the airflow, resulting in a lean fuel-air mixture. Adjustments can be made to the choke seasonally to compensate for this, with a leaner setting in the winter and a richer setting in the summer.
It is also worth noting that some chokes have a bi-metal feature that heats up and causes the choke to open from closed over time. This is influenced by the intake temperature, with the choke sensing the temperature and adjusting accordingly.
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The choke goes back to the choked position when it cools off
An electric choke operates by energising the choke circuit, which causes the bi-metal feature to heat up and open the choke. When the circuit is energised, the choke opens and stays open as long as the current is maintained. When the current stops flowing, the choke goes back to the "choked" position.
The choke will be in the closed or choked position when the key is off, meaning no ignition or accessory circuits are energised. This means there is no current flow through the electric choke circuit.
When the key is set to either ignition or accessory, the choke circuit is energised, and the bi-metal feature begins to heat up. This causes the choke to open from the closed position over time. The choke will open and stay open as long as the current is maintained.
If you shut down a hot engine, the choke will go back to the "choked" position when it cools off. It takes around 20 minutes for the choke to close after shutting down the engine. This can cause a flooded condition when restarting a warm engine. To avoid this, you can turn the key "on" and leave it for a minute before cranking the engine. This will open the choke, and the engine will start perfectly.
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The choke should be closed when cold, and open after a few minutes of driving
The choke valve in a car's engine restricts the flow of air into the engine, enriching the fuel-air mixture when starting a cold engine. Choke valves are usually seen in older cars, and in modern vehicles with fuel injection systems, they are not required.
Electric chokes are a type of automatic choke that works on a timer. When the ignition is on, there is a constant 12V flow to the choke's heat-sensitive spring, which pulls the butterfly valve open. The choke should be closed when the engine is cold, and open after a few minutes of driving. This is because the choke is designed to aid in starting a cold engine, and once the engine is warm, it no longer needs the choke.
The choke position is influenced by the engine temperature and the intake temperature. The choke will remain closed when the engine is cold, and as the engine warms up, the choke will begin to open. The intake temperature also affects the choke position, as the choke needs to be adjusted until the engine is warmed up enough to drive.
In some cases, the choke may not open or close properly due to issues with the heat riser or intake air stove. These components work to warm up the carburetor and manifold bodies, and if they are not functioning correctly, the carburetor can remain very cold even when the engine is running, delaying the opening of the choke.
It is important to note that electric chokes have some limitations. They operate based on a timer, and if the engine is not cranked immediately after turning the key, the choke may be partially or fully open when starting the engine. Additionally, electric chokes may not always accurately sense the intake temperature, which can affect their effectiveness.
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The choke should be fully open within 3-5 minutes of a cold start
The choke is an essential component of a cold engine. When dealing with a cold engine, the choke's role becomes crucial. The choke should be closed when starting a cold engine and should gradually open as the engine warms up. The choke should be fully open within 3-5 minutes of a cold start. This duration depends on the ambient temperature.
A warm engine has different requirements than a cold one. As the engine warms up, it needs more air. As the temperature rises, the engine's demand for air increases to maintain the right fuel-to-air ratio for efficient combustion. Thus, when the engine is warm, the choke must be fully open to allow ample air to mix with the fuel.
The choke can be tested by holding a match to the cover until the cover warms up enough to trip the bimetal switch, and you will see the light turn on and the current will flow through the switch. The choke can also be tested by running hot and cold water over it.
It is important to note that the choke should be adjusted seasonally, especially in cars without manifold heat. This is to ensure that the choke opens fully in the winter and is enriched in the summer for an easy start.
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Frequently asked questions
If your electric choke is on, you should be able to see it opening slowly. If it's off, you won't see any movement.
To turn your electric choke on, simply turn the key in the ignition. This will energise the electric choke circuit, causing it to open.
If your engine runs smoothly when cold but starts to run poorly as it warms up, this could indicate a choke that's not opening properly. Other signs include a broken wire in the heating element of the choke or a lack of power to the choke post.
To turn your electric choke off, simply remove power from the choke. This can be done by shutting off the car and the power source, or by hooking the choke up to a wire that only has power when the ignition is on.
