Hello all, I have posed this issue already with alot of good advice and ideas. However nothing seems to have worked. So I will give run down of problem and all attempted fixes. So lets see who the true Audi troubleshooting boss is! Thank You-
2006 A4/B7 auto 95K miles stage 1 Integrated Engineering tune all other is stock.
Current Issue is Erratic Idle (From 600 to 1300 RPM) Codes P0171, P0507, P0300 ,301,302,303,304.
Beautiful throttle response and boost. No Issues other than at idle (in or out of gear).
Work already preformed.
-AUDI warranty CAM job complete with cam follower.
-Fuel Filter
-Low Pressure Fuel Pump
-Different types of plugs all properly gaped, currently side fire Iridium.
-New black top coil packs
-Fuel pressure sending unit/sensor (thing on top of HPFP)
-Fuel pressure regulator (Brass reducer thingy)
-Diverter valve
-PVC valve and two hoses. (one did have crack which helped a little bit)
-N80 Purge valve
-Oil dipstick housing replaces
-Just had walnut shell medium blast on valves cleaning heavy carbon build up.
-Smoke test that found nothing after all these fixes.
-There is a small crack 1/2'' (minimal opening) on exhaust side of turbo housing. (I have great boost and accel)
So there you go. Any ideas remaining? Fuel cap, Fuel vapor stuff (all crap under wheel well by fuel fill) next? out of ideas.
Blue Driver OBD scan tool says remaining possible fixes could be for P0507 could be...
-valve cover
-Mass air flow need cleaning (I gave it a little blast of cleaner, nothing thorough).
-EVAP canister purge solenoid valve?
-Turbo charger inlet pipe.
-Camshaft oil seals
-Replace ECM
-Replace ENGINE !!!!LOL
-Replace Timing Chain Tensioners.
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