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A computational investigation of the effects of activation energy, porosity, and pore size on the gasification of combustion chamber deposits in spark ignition engines has been performed. The oxygen in the combustion gases reacts with the carbonaceous deposit and causes the deposit to burn away. Experimentally measured deposit parameters such as heating value, surface temperature, surface pressure and porosity were used in the model. Several models for predicting the gasification of the deposit were investigated. A random pore intersection model developed by Petersen was used to predict the gasification of the deposit. The chemical reactions were modeled with a simple Arrhenius expression. The flow within the deposit was modeled using Darcy's Law. The Kozeny-Carmen equation was used to relate deposit permeability and porosity. The model was incorporated into a finite difference code that predicts the heat transfer and fluid flow through the deposit.