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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? Thanks Owen
Err well here it is the first code to pop on the problematic ctt P0234 overboost. Was driving to today and booted it a bit and felt flat to redline Wtf, almost like the variocam didn't switch to high lift because the boost gauge said +0.8 bar still as per spec. So I whipped out the trusty v-checker which is always in the temperamental Pig in case, and it shows the P0234 code. I know the possible causes and have read a lot of posts of this code but not found any with fixes except loose piping broken piping which at the moment I'm thinking I don't have any (all bloody new). N75 valve is new, MAP sensor is original but I've cleaned it today and before it didn't make any difference then or now. Turbo problem possible but unlikely I think. So what does that leave? If I clear codes it won't return in short run but did after many Km today return and cleared again. No here is the only interesting thing about it, when the code is active it goes into a limp mode flat performance and the stutter hesitation I suffer with since I got the car goes away and it drive smooth but slower of course. I clear the code and get boost back but also the kangaroo stutter stammer acceleration. If I disconnect the map sensor exactly same result but a difference code like P???? Underboost which makes sense. So guys what makes a turbo engine do this?
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. Thanks, Connor