It's not to check that they're "not working" it's to check whether it has a flow issue that may potentially cause inconsistent flow. And how do you diagnose an injectors' health by listening to its ticks? @_@ Doesn't hurt to check, they're worth peanuts - heck I have a spare set you can take for $10. My throttle cable was kinked and started to tear up like a brush - which caused me to have "flat spots" - like it will just jump, replaced it and it was gravy. This was all on my mighty D15 also.
Just speaking from experience.
Peace.
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