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#Carburetor troubleshooting guide how to
#Carburetor troubleshooting guide manual
#Carburetor troubleshooting guide full

If the vehicle is displaying any sort of sluggish performance or misfires when you apply the throttle, then more adjustments are required. The engine should rev smoothly and quickly as soon as you apply throttle. Your throttle response should also be crisp and responsive.

#Carburetor troubleshooting guide full

If you notice any vibration or shaking, continue to make adjustments until the engine runs smoothly both at idle and while revving, through the full rpm range. Rev the engine up after every adjustment to see if it continues to run smoothly at higher rpms.

Step 5: Test the engine at idle and while revving. It should also rev smoothly through the full rpm range with no misfires or shakes when you apply throttle.

Tip: When the engine is running smoothly the idle speed will stay steady, and the engine will run in a smooth balanced manner, with no misfires, or shaking.

Tip: When the engine is running slightly lean the rpm will drop, the engine will begin to run rough, pop and sputter, until it stalls.īack off the mixture screw until the engine just begins to display symptoms of a lean mixture, and then tighten them down, in quarter turn increments, until the engine runs smoothly.

This will prevent any major fuel changes that could dramatically affect the performance of the engine.īack the adjustment screws off until the engine is running slightly lean. When making any adjustments, it is also important to make them in small increments of a quarter turn. Tightening the screw increases the amount of fuel, while loosening decreases the amount of fuel. Once the engine has arrived at operating temperature, go back to the carburetor and adjust the air fuel mixture screw, or screws. Step 4: Re-adjust air fuel mixture screws.

Tip: If you are still unsure about your engine’s condition, you may want to enlist the help a certified mechanic to inspect the engine to avoid making incorrect adjustments to the carburetor.

This will let you know if it is starved for fuel or is using an excessive amount. Use the table below to determine if the engine is running lean or rich.ĭiscerning whether the engine is running lean or rich will help you make the proper adjustments for best engine performance. Take note of the running condition of the engine. Start the vehicle and allow it to warm up to operating temperature.

#Carburetor troubleshooting guide manual

Tip: Carburetors may have several screws, so refer to the service manual to ensure that you have correctly located the screws to avoid making incorrect adjustments.These screws are responsible for controlling the amount of fuel that enters the engine, and improper adjustment will result in decreased engine performance. Once the air filter has been removed, and the carburetor is exposed, locate the air fuel mixture adjustment screws, these are often plain, flat head screws.ĭepending on the make and model of the vehicle, different carburetors may have multiple, sometimes up to four, air fuel mixture adjustment screws. Use a flat head screwdriver to adjust the air fuel mixture. This may require the use of hand tools, however, many times the air filter and housing are secured using only a wing nut that can often be removed without using any tools. Locate and remove the engine air filter and housing in order to access the carburetor.

Part of 1 of 1: Adjusting your carburetor

#Carburetor troubleshooting guide how to

This article shows you how to adjust the air fuel mixture and the idle air speed - the two most common adjustments made when tuning a carburetor. However, adjusting the carburetor is a relatively simple job that can be done with a basic set of hand tools and a little bit of technical knowledge. Although not many vehicles with carburetors remain on the road, it is imperative that the ones that do are properly tuned and adjusted to achieve optimum performance.Ĭarburetors can go bad for several reasons. While carburetors are not really considered commonplace anymore, for many decades they were the preferred method for fuel delivery, and working with them was a much more common occurrence. Before electronically controlled fuel systems were developed, vehicles relied on mechanically operated fuel delivery systems, oftentimes in the form of carburetors to supply the engine with fuel. While all modern cars use computer-controlled fuel distribution systems, there are still many vehicles on the road that employ the traditional carbureted method of fuel delivery.