I've had a pretty loud engine tick with my 22re truck since I've had it. I always though it was valve tick, but after several valve adjustments I bought a Mechanics stethascope. Using this I found out that the injectors seem to be the source of the loudest tick. I figure that some tick is normal for them, but I can hear it in the cab quite well, and standing on the passenger side of the truck it is very noticable.

Is this normal? I don't know anyone else with a 22re to compare it to.... Is this a sign that they need to be cleaned/rebuilt??

Thanks guys