Originally Posted by brokedown
Compared to replacing them all today, throwing one in the toolbox is a bargain. Fair point about figuring out which one is bad. Depending on how it fails you can use an infrared thermometer to find the cold exhaust header of a cylinder not firing.
Not necessarily. You can have an injector that works fine under load but not at idle, or one that fails under high actuation pressure.
Without cat et you really are just guessing
A much better use of money would be new injector o rings, new injector hold down bolts and maybe even new injector cups if you were up for a challenge. These are known failure points and are relatively inexpensive, in the grand scheme of things