I don't know if this is the right place to post this or not. I have a 04 2500hd A/D with only 18000 miles. The problem is when you are going down the road or when you take off from a stop you can hear the valves or something raddling very loud. Sometimes it does it sometime it don't. I was pulling my boat last weekend when it made a sound like it had ran out of oil. I lifted out of the gas and it quit. No lights have come on. I had it check at the dealer and they said nothing was wrong and was not showing "trouble codes". What they told me does not mean s%$t to me. I know something is wrong. This winter the truck when setting at a redlight would start ideling ruff and blow smoke. Again nothing could be found wrong. The winters were not that cold this year. Can anyone can help with this problem?

yea - belongs in another forum - this is for trucks that are down.

Have you considered that the noise you hear is the "pilot injection" turning off. It does it at about 2500 RPMs and over and makes a noise similar to what you described. Engine gets much louder when it's off. Do a search on it for more info.

this does not belong in this forum