What is the psi on a 1989 Chevy S-10 2.5?

There's no single PSI figure for a 1989 Chevy S-10 2.5L engine. The correct tire pressure is found on a sticker usually located on the driver's side doorjamb or in the owner's manual. This sticker will specify the recommended tire pressure for both the front and rear tires, and it may vary depending on the load.

For the engine itself, there are multiple PSI values depending on what system you're referring to:

* Fuel System: The fuel system pressure will vary depending on the specific engine configuration and is not something easily looked up without more specifics and a fuel pressure gauge. It's best to consult a repair manual specific to your 1989 Chevy S-10 2.5L engine.

* Cooling System: The cooling system pressure (radiator cap pressure) is typically around 13-16 PSI. Again, check your owner's manual or a repair manual for the specific details. This is NOT something you should try to measure without the right tools and safety precautions.

Therefore, you need to specify what system you're asking about (tires, fuel system, cooling system, etc.) to get a meaningful answer. Always consult your owner's manual for the safest and most accurate information.