Engines from that era were designed for gasoline (with a very low, if any, ethanol content). Ethanol is corrosive to certain materials used in older fuel systems, can damage seals and gaskets, and its different properties can affect fuel delivery and combustion. You'd likely see issues with:
* Fuel lines and seals: Ethanol can degrade rubber and plastic fuel lines and seals, leading to leaks.
* Fuel pump: The ethanol can damage the fuel pump's seals and components.
* Carburetor or fuel injectors: These components are not designed to handle ethanol's different properties, leading to poor fuel delivery or damage.
* Engine damage: Inconsistent fuel delivery and combustion can lead to engine damage.
To run E85, the vehicle would need significant modifications, including potentially replacing many fuel system components. It's simply not a practical or safe endeavor for a 1997 Explorer.
