How Do You Troubleshoot Walbro Carburetors?
Walbro carburetors are, by design, very reliable. Although carburetors are no longer used on production vehicles, older vehicles that are still on the road do use them. A Walbro carburetor draws in air from outside the engine bay and mixes it with gasoline. The fuel is then sent to the engine to be burned. If you are experiencing a rough idle, you should do some troubleshooting to discover the source of the problem. Fortunately, there are only two common problems with the Walbro carburetor. Start the engine and check the idle speed. The carburetor should be mixing the air and gasoline at a 14.7-to-1 ratio. If it is not, the idle will drop below 500 rpm on the tachometer. Open the hood and locate the two screws at the base of the carburetor. These screws are the adjustment screws for the Walbro carburetor. Turn these screws counterclockwise with a screwdriver to allow more air into the system and, consequently, produce a higher idle speed. If the idle does not increase when you turn the
