orange ground wire????

[motocrossed733]

On the back firewall of the 5.0 fox where does the orange ground wire supposed to hook up ??? What is the purpose, what will car do without it?

 

[asecretfile]

On the back firewall of the 5.0 fox where does the orange ground wire supposed to hook up ??? What is the purpose, what will car do without it?

I believe that is your HEGO 02 ground wire with a ring terminal attached to the back of the head

Without it your eec wont adjust the fuel at part throttle

Not used at WOT