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Several engineering ideas have made use of waste heat recovery methods in recent years. Research in this area focuses on a variety of control and engine management technologies with the overarching goal of improving fuel economy, vehicle performance, and fuel efficiency. This document lays out the plans for using the engine's dissipated heat energy to warm the fuel before it enters the engine to burn. Fuel poured into a fine mist and mixed with air keeps an internal combustion engine going. To prevent engine damage, most internal combustion engines use liquid cooling, which involves either using air, which is a vapour, or a fluid coolant that passes through a heat exchanger (radiator) cooled by air. In an air-cooled motor engine, the goal of the endeavour is to warm the fuel before it reaches the carburettor in order to atomize it more. This study presents an alternative to preheating using engine waste heat, which is advantageous since it reduces strain on the engine and may be used to heat fuel. Vehicles powered by internal combustion engines may benefit from increased thermal efficiency via the use of waste heat from exhaust gases. However, not all exhaust gas heat recovery systems are up to snuff in terms of light temperature and exhaust gas energy. Exhaust gas heat is mostly affected by the combustion phase; spark timing delays have the potential to greatly enhance this heat. At both steady-state and dynamic operating circumstances and engine modes of operation, this study examines how a substantial spark-ignition delay affects heat and exhaust gas. The results showed a remarkable 82.02% gain in fuel economy, which is outstanding but not definitive since the testing were only conducted up to 4500 rpm. Additionally, there was a noteworthy drop in pollutants. [ABSTRACT FROM AUTHOR]