I drove my truck about 90 miles today. When I got home I decided to take a good look under the hood. I have the same noise at idle. It sounds like its coming from the front drivers side of the engine. It's definately not the fuel injectors. It sounds something like a sticky valve lifter, but after removing the oil cap I found that not to be the problem. I'm glad It's still under warranty. Did the service department give you any information about the noise. They told you it was normal, but did they give you an idea of what it is.
I checked the service bulletins, and I think my problem is:
* IF YOU CONFIRM: An applied vehicle, when accelerating at 1/8 to 1/2 throttle opening, has a ticking noise coming from the engine area that sounds like spark knock, AND You confirm the noise is not spark knock related, ACTION: Install a new ExhaustManifold. Refer to the Service Procedure for details. See this bulletin for further detail.
I guess I'm going to the dealer...
I checked the service bulletins, and I think my problem is:
* IF YOU CONFIRM: An applied vehicle, when accelerating at 1/8 to 1/2 throttle opening, has a ticking noise coming from the engine area that sounds like spark knock, AND You confirm the noise is not spark knock related, ACTION: Install a new ExhaustManifold. Refer to the Service Procedure for details. See this bulletin for further detail.
I guess I'm going to the dealer...