Originally Posted by jaysix
So my 2006 hemi Commander with 76000 miles has a very loud tick when driving. You can't really hear it at a stop but when you give it gas it is very prominent and it doesn't go away. I read about the Hemi tick but this tick just doesn't seem right. I had it back to the dealership thinking it was an exhaust leak but they said that it wasn't and that its a normal sound. Any other ideas of what could be causing this and possible fixes? Any help would be greatly appreciated.
Lifters can be tricky to diagnose. They are even a bigger PITA to access on the 5.7L HEMI....lots of disassembly.
Some forum members recommend some Seafoam in the oil just before an oil change. It is purported to clean out the crud. dmsfun
says it cleared up his hemi tick; I am not a fan of Seafoam so I cannot speak from experience.
Recommend you also use an old mechanic's trick (...back in the day...):
Use a long screwdriver to listen to each fuel injector with the engine running. Put the metal end on the injector body and the handle pressed to your ear. See if one or more of the injectors is emitting excessive noise (compared to the others). This is a purely subjective evaliuation.
If you hear something different, add a bottle of fuel injector cleaner and re-check after 1-2 tanks of gas.
A mechanic's stethoscope will also give you the same info. The EGR valve is not open at idle (or shouldn't be) but you can listen to it. A reader is better for that (ie, checking EGR position and error).
Please be careful about using these tools around a running engine.
: This advice may be worth what you paid to get it.