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Transitioning from previous thread to new one-- Replaced the water pump and performed the 60,000 mile service in my 04 Turbo Cab. Car runs great except now I am getting overboost to 1.0-1.3 bar. I don't hold it there to be sure. That said, I realize it is likely a vacuum issue but the only lines I touched during the repair are the one from the Y-Pipe to the switch and the one from the switch to the plastic line that goes to the driver side of the engine. Flashlight and inspection mirror show the 3rd line on the underside of the switch to be connected. Any thoughts on where else to look?
Hey guys, I'm trying to figure out an issue in my TT. Boost delivery isn't as smooth as it used to be. Under constant throttle application (lets say half throttle) boost will hold at .4bar for a number of seconds when it should really be building up, and then all of a sudden it jumps up to 1.2bar and takes off. Occationally it will jump up to 1.5 bar and hold until I let off (I don't hold it for long, and I try to avoid this). I've got an EPL K16 flash set for 1.2 bar, so 1.5 is overboosting. And then, sometimes I just can't get up to the 1.2 bar...it will max out at .8-.9 occationally.
So far I checked the hoses at the N75 valve, they look ok. I found a big crack in the Y-hose, that plugs into the bottom of the DV's. I replaced that hose, and still have unsmooth boost delivery. What else might be the culprit here? Maybe the N75 valve is on its way out? Sticky wastegate actuators? I haven't gone underneath to investigate them. Any help is appreciated.