Final answer:
Excessively high engine temperature often results in engine overheating, reduced cooling efficiency, damage to engine components, and poor lubrication.
Step-by-step explanation:
Excessively high engine temperature can result in several problems. One common issue is engine overheating, which can lead to engine damage and potential breakdown. High temperatures can cause the engine coolant to boil and evaporate, resulting in reduced cooling efficiency. This can also lead to the degradation of engine components such as gaskets, seals, and hoses. Additionally, excessive heat can cause the engine oil to break down, resulting in poor lubrication and potential engine damage.