Originally Posted by
SmokinS13SR20
Does anyone know which ground the ecu uses to ground the injectors? Does it run through any plugs, like the gray one near the battery?
The injectors are grounded through the ECU. The ECU has low side drivers. The ECU gets its ground from the 2 ring terminals that bolt to the intake manifold. It's possible to blow up injector drivers, but uncommon. Your injectors should have 12V constantly.