Sounds like what my truck has been doing for quite sometime. Its from a
injector that is nearing the "out-of-spec" and not closing all the way
(probably). Are you hearing a very noticable metalic tick that changes alittle
while running? Sometimes it does it louder than others.
These injectors are like spark-plugs in my opinion some will last longer than
others... A solenoid A-top an Injector is only good for so long... i was really
peaved when i found out that the injectors were electricly fired, and atleast
2 times per piston stroke...
Oh well, ill keep her untill the 100,000 mark comes around (Warranty Ends)
Wouldnt want to absorb an entire engine meltdown, or close to it, because a
injector wants to stay open and do what you see in ceamans Thread.
-Mitch

Still lovin tha truck
P. S. If my truck was or gets any louder than it is, i would take it to the
dealer and make them do the Inj. shutdown test. So, yes i say take it to the
dealer.