Have just purchase a second hand ECU with an upgraded chip. Came off a the same year car as my.(94 wrx import).but when i come off the throttle (over run) i am geting a pop noised come for the the exhaust like a slight back fire?. Put my old ECU back on and it goes away.

 

what chip is in it?

 

Is your car fully decatted???

Tony

 

Not fully de-catted
Zerosport jap one
http://www.zerosports.co.jp/en/index.html

 

btt

 

btt

 

cant help as I dont know the chip.

David