Clicky clak,clickity clak

[Silver Bullit]

My 03 ho in the last few months has had a noticeable clicking noise under the hood when warm. It sounds like a loose rocker arm. I check all the valve adjustments and they are fine. I ran the truck with the valve cover off and the noise seems to be coming from an injector? My fuel mileage had gone down quite a bit, but there is no evidence of fuel in my oil! Is it possible that the injector can make this noise? I have tries three different fuel additives but nothing has helped. In fact i think i may have another injector starting as well as the noise is getting louder. I don't really care that is louder, it's a diesel what else would it be if it wasn't loud. I just know that it is not right and want to fix it. The truck only has 18,000 km on it(11,000 miles) Anyone have this problem or know the fix.

 

[rbattelle]

It depends on what sound you're describing. If it's a "click", I'd say there's a solenoid problem with one (or more) of your injectors. If it's a "knock" then it's probably the infamous 3rd gen knock. Check out this thread.