Ok, my ecu has been chipped for ~1.5 years. Not sure what program it was using, but it was running fine. I went to switch to an uberchip and put my 450s in... but when I went to fire up the car the CEL came on, and it's in limp mode. It's not throwing any codes, (Code 0) so what went wrong? I didn't solder/desolder anything, I didn't do ANYTHING but switch out the chips. Now even when I switch back to the old chip it CELs. When I cut J1 it still CELs. When I tried it on another car it also CEL'd. What's the deal?

 

try removing the injectors and put back the old chip to see if theres still a prob.

 

Is that ecu JDM by any chance? I did the same and mine solid cel too. I chipped my JDM P72 and no matter what it solid cel.