What you might be interested in is the idle speed. This is the RPM (revolutions per minute) at which the engine runs when idling. For a 1989 S10 with a 2.5L, the factory idle speed is typically around 650-750 RPM. However, this can vary slightly depending on factors like engine temperature, vacuum leaks, and the condition of the components.
If your question is about how long the engine can idle *before potential issues*, that depends heavily on several factors:
* Engine condition: A well-maintained engine can idle for hours without significant problems. A poorly maintained engine might overheat or experience other issues much sooner.
* Ambient temperature: Idling in hot weather puts more stress on the engine and can lead to overheating faster.
* Load: Even at idle, accessories like the air conditioning will put a small load on the engine.
In short, there's no set time limit. Instead of focusing on a specific idling time, pay attention to the engine's temperature gauge and listen for unusual noises. If the engine starts to overheat or sounds abnormal, it's time to turn it off.
