fattyalx

So my audi has been good to me, ever since I bought it and got it running. All of a sudden, (For no reason) it started to give me starting issues. In the warm it'll start and then die out until you give it throttle and after about a minute it'll idle fine and run fine, but it seems like it lacks power until its fully warmed up. When it's cold, or like 50F or below, itll start, run for about 10 seconds and then die whether I give it throttle or not. I replaced the 2 coolant temp sensors, the ISV, I thought it was maybe the decel valve so I replaced that, replaced the Idle sensor, and fuel pump relay. Also I took apart the WUR and cleaned that. I have a second set of injectors I plan to clean out and let soak in cleaner, and new O rings for them as well I want to install sometime. What should I look at next? Also i dont believe theres a vacuum leak, as when It was warmer and I could still drive the car because it would stay running, I took it to work(I work at a dealership) and I smoke tested the vacuum line system and found no leak at all. Most lines are pretty new, I have checked the Michiline man hose, the T hose on the valve cover, the crank case vent hose, nothing has cracks or indicates a vacuum leak. I really am confused as what I should look at next to fix this. Really miss driving this car, been about a month or so since it has moved from the spot it's in. Any help is greatly appreciated.

audi_marv

Fuel pump relay....Fuel pump valve.....Cold start valve (6th injector), Fuel Regulator/Fuel pressure ... ??

Sounds like after shutting the vehicle off, or sitting a while, you're losing fuel pressure either thru the valve, regulator, or leaky injectors. After the pressure builds back up...it runs fine.