Which of the following is NOT a sign of faulty valves?

High engine temperature is typically not a direct sign of faulty valves. Instead, elevated engine temperatures can be attributed to a variety of other issues, such as coolant problems, improper lubrication, or external heat sources affecting the engine. While valve problems can lead to overheating indirectly—due to poor combustion or inadequate exhaust flow—these symptoms are not immediately associated with the condition of the valves themselves.

In contrast, hard starting, loss of power, and low compression are more directly linked to faulty valves. For example, if the valves are not sealing properly, it can lead to a loss of compression, making the engine hard to start and causing a loss of power during operation. Thus, high engine temperature is not specifically indicative of faulty valves, differentiating it from the other options.