2005 jetta gli 1.8t awp with a TC K04 Hybrid, Bosch 550cc injectors, Forge 008 DV, CTT oil catch can. BDT "stage 2" mafless tune. The car does not blow any smoke when revving or driving, or when driving and letting off the accelerator. when coming to a stop it still start to puff a big amount of smoke when it starts idling. it tuned for 15psi of boost and holds it, no issues with the turbo spooling or making boost. fairly new turbo as well. I just don't understand why it only does it at an idle. if it were valve seals wouldn't it smoke on startup? and if it was rings wouldn't it smoke when accelerating? I need to do a compression test to verify rings but it seams unlikely. and if it is the turbo why only at idle does it smoke and not when it's making boost? vacuum issue or catch can related? I'm lost on what to look for. Catch can has absolutely 0 oil in it.I changed the 02 sensor and changed the oil to 5w40 from 5w30 and still the smoke persists. same exact thing it's been doing. you can beat the **** out of the car and not a wink of smoke will come out but it idles for 5 mins and it starts smoking and smells weird. don't exactly smell like buring oil and definitely don't smell like coolant. I took the plugs out and they looked pretty dry almost like the car was leaning out. but they were clean(didnt look like they were buring oil). changed the plug and the car did run a little better and idled way better. but still it smokes. 0 smoke on decel even when pull around 25inhg of vacuum.im stumped to say the least.