* Engine Mounting: The engine mounts, which hold the engine in place, are designed specifically for the 1.8 liter engine. A 1.5 liter engine might not fit properly and could cause major issues with the vehicle's stability and handling.
* Transmission Compatibility: The 1.5 liter engine might have a different transmission mounting point or require a different type of transmission altogether. This means you'd need to find a compatible transmission, which can be difficult and expensive.
* Wiring and Electronics: The engine control unit (ECU) and wiring harness are designed to work specifically with the 1.8 liter engine. A 1.5 liter engine would have a different ECU and wiring system, requiring extensive modifications to make it work.
* Exhaust System: The exhaust manifold and system are designed for the 1.8 liter engine's exhaust flow. A 1.5 liter engine would likely have a different exhaust system, requiring a complete replacement.
* Cooling System: The cooling system, including the radiator and hoses, may be incompatible with the 1.5 liter engine.
* Air Intake and Fuel System: The air intake and fuel delivery system are tailored to the 1.8 liter engine. Replacing them for a 1.5 liter engine could be difficult and expensive.
Instead of trying to swap an engine, consider these options:
* Rebuild the existing 1.8 liter engine: A rebuild can restore your engine to like-new condition and extend its life significantly.
* Find a used 1.8 liter engine: You may be able to find a used engine from a similar model year Mirage, but be sure to check its condition thoroughly before purchasing.
* Engine swap with a compatible engine: While swapping engines is complex, you might find a different engine that's a direct swap for the 1.8 liter (e.g., another Mitsubishi engine of similar size). However, research this thoroughly and consult with a qualified mechanic.
Before embarking on any engine work, it's crucial to consult with a reputable mechanic to assess your specific situation and provide you with the best course of action.
