What is a common cause of engine misfires?

The common cause of engine misfires primarily revolves around faulty spark plugs, fuel delivery issues, or air leaks. Spark plugs are essential for igniting the air-fuel mixture in the combustion chamber, and if they are worn or malfunctioning, they can fail to create a proper spark, leading to incomplete combustion and misfires. Similarly, if there are problems with fuel delivery, such as clogged fuel injectors or a failing fuel pump, the engine might not receive the correct amount of fuel needed for optimal performance. Air leaks in the intake system can lead to an improper air-fuel mixture, further contributing to misfires.

In contrast, excessive oil pressure does not directly affect engine firing; it relates to lubrication and engine health. Low coolant levels are associated with overheating issues and cooling system performance but have no direct connection to firing issues in the engine. Incorrect tire pressure affects vehicle handling and tire wear but does not influence engine operation or its ability to combust fuel properly. Thus, the key factors leading to engine misfires center upon the components that are directly involved in the combustion process.