Car Engine Choke
A choke is a device used in carburetor-equipped gasoline engines to increase the air-fuel ratio during engine starting, when the engine is cold.
How a Choke Works
A choke works by restricting the airflow to the carburetor. This causes the engine to draw in more fuel, which makes the air-fuel mixture richer. A richer mixture is easier to ignite, which helps the engine to start.
There are two main types of chokes: manual and automatic.
- Manual chokes are operated by the driver. The driver pulls on a knob or lever to close the choke. This type of choke is commonly found on older vehicles.
- Automatic chokes are controlled by a thermostat. The thermostat senses the temperature of the engine and opens or closes the choke accordingly. This type of choke is more common on newer vehicles.
When to Use a Choke
A choke should only be used when the engine is cold. Once the engine has warmed up, the choke should be opened to allow for normal air-fuel mixture flow.
If a choke is used when the engine is warm, it can cause the engine to run rich. This can lead to a number of problems, including:
- Poor fuel economy
- Engine hesitation
- Black smoke from the exhaust
How to Use a Choke
To use a manual choke, pull on the knob or lever until the engine starts. Once the engine has started, gradually open the choke until the engine runs smoothly.
To use an automatic choke, simply start the engine and allow the choke to open automatically as the engine warms up.
Troubleshooting Choke Problems
If you are having problems with your choke, there are a few things you can check:
- Make sure that the choke is opening and closing properly. If the choke is not opening, the engine will not get enough air and will run rich. If the choke is not closing, the engine will not get enough fuel and will not start.
- Check the thermostat. If the thermostat is not working properly, the choke may not be opening or closing at the correct time.
- Check the vacuum lines. If the vacuum lines are damaged or disconnected, the choke may not be able to function properly.
Conclusion
A choke is an important part of a carburetor-equipped gasoline engine. It helps the engine to start when it is cold. However, it is important to use a choke only when necessary. If a choke is used when the engine is warm, it can cause a number of problems.
