Just tried to read ecu on a 2004 Forester XT. Hooked up the green connectors and read ecu using ecuflash. Now the car runs terrible, wont idle once engine is warm and wont accelerate like it should.
My question is, what happens during the inital "read ecu"? My understanding was it doesnt flash or write to ecu. I'm wondering now if it overwrote my base map?
Thanks for your help.