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Choosing the right gas and fuel mixture will help prolong the life of your car’s engine. If your engine is not running smoothly, you must adjust this mixture and choose the appropriate idling mode to reduce the pressure of the engine, not to let the engine run too fast or too slow. Car carburetor tuning involves just a few very simple steps and doesn’t require cumbersome tools. See Step 1 for more details.
Steps
Adjustment of Gas and Fuel Mixture
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Locate the air filter and remove it. In most cars, you will have to remove the air filter to see the carburetor for adjustment. Open the cover and be sure to turn off the engine before removing the air filter and cover. Unscrew the pink cochlea and connections, then remove the entire air filter.
- Depending on the make and model of the vehicle and the type of engine, the air filter can be in different locations on the engine. Refer to the owner’s manual or shop instructions for your vehicle type.
- On most carburetor vehicles, the air filter housing will be attached directly to the carburetor.
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Find the adjustment screws on the front of the carburetor. There will be 2 screws on the front of the carburetor, used to adjust the air and fuel mixture.
- Usually these screws will look like flat head screws and you can use a screwdriver to twist them out and then adjust the amount of air and fuel mixture in the carburetor.
- Some carburetors, like the Quadrajet that most GM cars use, have a special screw that you must use a separate tool to adjust. Quadrajet carburetors use a Double D-style head adjuster.
- Other carburetors may have 4-angle adjusting screws.
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Start the engine and heat to normal working temperature. Check the temperature scale to determine if the engine has reached the appropriate running temperature, and listen to the engine sound to get a sense of what needs to be adjusted.
- The engine lacks gasoline will emit a ping sound when the rpm is high, when the control valve is open, the engine may be flooded with oil. Add the required amount of gasoline to the mixture.
- An engine with excess gas probably won’t change the engine’s sound, but you can smell it. Lower the fuel level. [1] X Research Source
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Adjust the screws evenly and select the appropriate mixture. Tuning a carburetor is like tuning a guitar or stringed instruments. You all want to turn the screw evenly, slowly until you find the point that fits your hand best. Regardless of whether the engine is too low on gas or too rich, lower to a poor air mixture by turning both screws a quarter turn at a time counterclockwise then slowly turning until get a balanced and smooth gas mixture.
- Adjusting the gas mixture is a rather obscure art, it requires you to understand and listen to the sound of your car’s engine. Tighten both screws slowly and listen to the smooth, even engine sound. When there is any creaking or creaking sound it is a sign of poor air mixture. Keep turning until you find the right spot.
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Reinstall the air filter. Once you’ve adjusted the carburetor, put the air filter back in place and you’re good to go.
- If you need to adjust the idle speed as well, don’t rush to put the air filter back in place until you’re done. [2] X Research Source
Adjust idle speed
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Find the adjustment cable and the no-load adjusting screw attached to it. It will be connected from the throttle valve or accelerator through the fan housing to the carburetor. Usually, if you can’t find a screw, consult your owner’s manual or the store’s instructions for your vehicle’s make and model.
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Start the engine and heat to normal working temperature. When you use the air/fuel mixture, let the engine run for a while to make sure you’ve adjusted to actual running conditions.
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Tighten the no-load adjustment screw. Turn clockwise, half a turn, and listen to the engine. In most manuals there is an ideal idle speed, though you still have the flexibility to adjust if you want faster or slower speeds. Refer to the user manual for specific numbers and refer to the speedometer as you make adjustments.
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Listen for unusual engine noises and make adjustments if necessary. The engine will take about 30 seconds to adapt to the changes you’ve adjusted, so don’t crank and over-adjust. Turn gently and listen to the engine sound carefully.
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Reinstall the air filter and get the job done. When you have achieved idling to the respective defined specifications or to your own requirements, turn off the engine and install the air filter to get the job done.
Advice
- If your vehicle is equipped with a tachometer, you can use it as an idling speed regulator (rpm or RPM). Check the manual for the exact rpm per minute.
- If, after adjusting the idling mechanism, the engine still does not run smoothly, return to the gas and fuel adjustment and repeat the steps to adjust both the air mixture and idling.
- Tighten the idling adjustment screw to increase idling speed or loosen the screw to decrease idling speed.
Warning
- You need to remember that when you work with the carburetor, you are working with the fuel source. Use caution when dealing with gasoline.
Things you need
- Flat head screwdriver
- Pliers
- Tissue
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This post has been viewed 32,250 times.
Choosing the right gas and fuel mixture will help prolong the life of your car’s engine. If your engine is not running smoothly, you must adjust this mixture and choose the appropriate idling mode to reduce the pressure of the engine, not to let the engine run too fast or too slow. Car carburetor tuning involves just a few very simple steps and doesn’t require cumbersome tools. See Step 1 for more details.
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