What effect does increased engine temperature have when running too lean?

When an engine runs too lean, it means that there is an insufficient amount of fuel mixed with air in the combustion chamber. This can lead to higher combustion temperatures because there is not enough fuel to absorb the heat generated during the combustion process. As a result, increased engine temperature can cause various forms of damage to engine components.

For instance, higher temperatures can lead to overheating of engine parts, causing warping or failure of critical components such as cylinder heads, pistons, and valves. Additionally, the exhaust system can also be at risk, with the potential for damage to the catalytic converter, which can be adversely affected by excessive heat.

Understanding this relationship between running lean and increased engine temperature is crucial for maintaining engine health, as prolonged operation under these conditions can result in significant mechanical failures and costly repairs.