420a ecu not sure what year

[eclipsekid1013]

Alright guys I have a 99 eclipse gs with a motor from a 96 in it. I believe my misfire issue is an ecu issue. I posted about the misfire and someone brought up the idea that the ecu may be bad. Before I swapped the motor a cel came on but I thought it was because something in the bad motor. So we went ahead and swapped It havin to change all the sensors and so on over from the pulled 99.after looking into the ecu idea I determined the ecu on the car was from a junkyard. Now my question is when I start to look for another ecu do I need a 99 ecu or 96? Thanks for the help

 

[starfish]

Alright guys I have a 99 eclipse gs with a motor from a 96 in it. I believe my misfire issue is an ecu issue. I posted about the misfire and someone brought up the idea that the ecu may be bad. Before I swapped the motor a cel came on but I thought it was because something in the bad motor. So we went ahead and swapped It havin to change all the sensors and so on over from the pulled 99.after looking into the ecu idea I determined the ecu on the car was from a junkyard. Now my question is when I start to look for another ecu do I need a 99 ecu or 96? Thanks for the help

The ecu that you use has to be the same year as the wiring harness that you are using.The year motor doesn't matter,you have to match the computer with the harnessI have a 96 eclipse with a 99 motor.When I put in the 99 motor ,it had all the 99 sensors on it.So I had to change the 99 sensors to the 96 sensors to match up the plug ends on the harness

 

[eclipsekid1013]

Ok so 99 ecu thanks alot