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does the number on the outside of the ecu mean much?


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i got a ecu out of a junked 1800 turbo wagon, same place i got the motor.

 

same year as my rx and nothing appeared to be wrong with the wagon ( hence why i picked it for the engine pull), well i plug the ecu in and try to start the car and nothing changed except now i'm getting no spark at all..

 

the mechanic well the car is says that the ecu has to be EXACT or else it wont work...is he right ?

 

my ecu number was a 53, and the one i pulled is a 27..any ideas?

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