Unless you unplug all injectors, there will be voltage on both wires. On this system, the grounds are shared. Use a noid lite, see if you have injector pulse? The computer controls injector ground. If you have voltage at the injector, but no ground, one possibility is the computer doesn't see an rpm signal. There could be more than one reason for that.
Thursday, August 19th, 2010 AT 1:45 PM