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Using an ECM (Engine Control Module) from a 1989 Dodge B350 in a 1990 B250 is generally not recommended due to potential differences in engine specifications, wiring harnesses, and system calibrations between the two models. While both vehicles are from the same manufacturer and era, variations in emissions regulations and engine performance requirements can lead to compatibility issues. It's best to use an ECM specifically designed for the 1990 B250 to ensure optimal performance and reliability.

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1w ago

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