Driving under the influence of alcohol is one of the leading causes of car accidents, according to risk analysis. If drunk drivers were deterred from operating vehicles through the deployment of alcohol-detecting systems, many lives could be spared. In this investigation, a sensor called the MQ-3 is used to measure the amount of alcohol in human breath. A prototype spark plug-producing ignition system is constructed to act as the ignition starter for the engine. Depending on the blood alcohol content (BAC) of a person's breath, the alcohol sensor will decide how the ignition system operates.