YoNkErS87t said:Where does the fifth runner ground go to? The Firewall? Probaly a stupid question.
I'm not exactly sure where it physically connects, but it should join the wiring harness. It is where the ECU gets ALL of its ground reference. Take note that the ground is used as a reference when the ECU measures voltage from, well, EVERY SINGLE SENSOR! Anyway, check that very thouroghly. Not only tight, but very clean and totally corrosion free.