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Will a 2.5 liter L4 engine out of 1994 Dodge spirit work in 1986 Chrysler Laser which had 2.2 L4?

No, a 2.5L engine from a 1994 Dodge Spirit is highly unlikely to be a direct bolt-in replacement for the 2.2L engine in a 1986 Chrysler Laser. While both are 4-cylinder engines, there are significant differences across model years and platforms that would prevent a simple swap:

* Engine Mounts: The engine mounts on the 2.5L and 2.2L are almost certainly different. The 2.5L will not fit in the 1986 Laser's engine bay without significant modification or custom mounts.

* Transmission: The transmission compatibility is also a major issue. The 1994 2.5L likely used a different transmission than the 1986 2.2L. You'd need to ensure the transmissions are compatible, and that might require a whole transmission swap as well.

* Wiring Harness and Computer: The engine control systems are entirely different. The 1994 engine will have a different wiring harness, computer (ECU), and sensors, making it impossible to integrate into the older Laser's electrical system without extensive rewiring and potentially a custom ECU solution.

* Exhaust System: The exhaust manifold and overall exhaust system will be different and incompatible.

* Other Components: Other components such as the cooling system, power steering, and alternator might also require modification or replacement to accommodate the larger engine.

In short, while it might *theoretically* be possible with significant fabrication and engineering work, it would be a very complex and expensive project, far beyond a simple engine swap. Finding a used 2.2L engine or a compatible upgrade within the same generation of Chrysler vehicles would be a far more practical approach.

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