In Thailand, exhaust emission from automobile has been one of the major pollution problems. It is known that Intake Valve Deposit (IVD) causes poor driveability and deterioration of exhaust emissions, but there has been no established test method of IVD in Thailand. Toyota 1G-FE engine was selected for an IVD test. After the evaluation of IVD from various experiment using the matrix of various engine speed and load, the combination of 3000 rpm and 50% opened throttle was determined to be the most appropriate operating condition of this IVD test. This test method has good repeatability and can differentiate IVD weight from different fuels or additives. This new test method may be considered to be the standard IVD test method for Thailand in the future.