Not real familiar with a V8, but assume this should work the same as a 4 cylinder. With the engine running, one at a time, pull the electrical power to each injector. If the injector is good the engine should run rougher (reconnect the injector before unplugging the next one). If it is the bad injector, there should be no change. You could also accomplish the same thing by pulling spark plug wires, however, there could be a electrical shock risk.
I assume you could use a volt meter to determine if it is a bad injector or bad wiring once you determine which cylinder it is (sorry, don't know what the voltages would be but I'm sure the info is on line). You could also swap the possible "bad injector" with a good one and perform the above test on the two cylinders with the swapped injectors. If no change with the original bad injector cylinder, its the wiring/signal, change... its the injector.
I do realize that the idle change in an V8 will be less than in a 4 banger, but I assume there should be a difference.
Hope this helps.
Miles Ventura, CA2001 Dak Club Cab w/2.5 liter
> ------------------------------
>
> Date: Sat, 10 Nov 2012 17:55:55 -0500
> From: Jamie C <jamie12ga@gmail.com>
> Subject: DML: OBD II code
>
> On my '96 OBD II, I am pulling a 27 code with the key on/off method which
> is, "Injector #?? output driver does not respond properly to the control
> signal" where ?? could be injector 1 through 8.
> Will a scan tool tell me the exact injector that is giving the code? Any
> other tips for this code?
> Thanks
>
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