Hi Brad, Just an FYI, my LionMaster Big Boy does not smoke at idle, and it isn't the most powerful smoker compared to other Lionel Steam Engines I own. Keep in mind though, and I forgot to mention this in earlier posts, that my LionMaster Big Boy from the 2008 catalog is a Legacy and I don't think the LC+ 2.0 as all the same features as Legacy.
The early Legacy models indeed didn't have the same smoke features as the LC+ 2.0. The LC+ 2.0 models do have idle smoke. I suspect he just needs more smoke fluid, my little LC+ 2.0 0-6-0T needed closer to 35-40 drops of fluid to properly smoke from brand new with dry smoke units.
FWIW, I made a version of my Super-Chuffer II specifically for early Legacy steam to enhance the chuffing and add idle smoke. It also gives you rule-17 LED headlight if you want to install that feature.