I've searched on here and read several threads about this issue. I want to preface saying I've had this happen before where when you got to pretty high RPM's like passing on a two lane road and it would go in to LIMP mode pretty much every time, and you could feel it. For older TDI owners, it felt a little like pulling a muscle when doing a pretty normal or easy task....where you get that TWANG feeling and immediate use is hindered, but it still works. I could turn off the key and turn it back on to fix, then keep the RPM's below that 3K threshold, maybe.
PRESENTLY - Car has almost no boost most of the time. It maxes at maybe 1.7 to 2 according to scan gauge. It is almost unnoticeable when it loses its boost now until you try to accelerate again. I can hear the turbo spool up, but it just won't do anything, so I feel like that is a good sign. If the actuator for the turbo is near the top of the motor and a little bar similar to a carb throttle lever, then it seems to move freely. I read the N75 should be tested....I have the other one that is to the left of the N75 from a parts car, I was thinking about plugging in....are they the same (the grey top one vs the black top one). I replaced a few small vacuum lines, and also noticed there is a bend in one larger black rubber hose, just smaller than a garden hose, and clearly it is been replaced, as it has worm clamps on it....it seems to have a restriction at the bend, like mildly kinked. Thought I might replace that. I cleaned the snow screen of a LOT of debris, and also did the air filter. I checked the line that connects under the air filter and it seemed to be fine. I replaced a few short vacuum lines with McMaster Carr stuff I had from my previous vac line swap. Still have not found the problem. Maybe need to try a MAF test, but wanted to run the symptoms by this group to see if there is any insight based on my particular case. By the way, when I say I hear the turbo spool up, I mean, even if there is no boost, I can hear it, so that seems like a good thing. It's a VNT17 with Rocketchip RC3, and also has one EGR mod....I can't remember what it's called, the one that makes it so the intake wont get clogged. Other than that I cannot remember what is done to the car that could affect this...it has T4 nozzles that have probably 150K on them without cleaning or pop test.
PRESENTLY - Car has almost no boost most of the time. It maxes at maybe 1.7 to 2 according to scan gauge. It is almost unnoticeable when it loses its boost now until you try to accelerate again. I can hear the turbo spool up, but it just won't do anything, so I feel like that is a good sign. If the actuator for the turbo is near the top of the motor and a little bar similar to a carb throttle lever, then it seems to move freely. I read the N75 should be tested....I have the other one that is to the left of the N75 from a parts car, I was thinking about plugging in....are they the same (the grey top one vs the black top one). I replaced a few small vacuum lines, and also noticed there is a bend in one larger black rubber hose, just smaller than a garden hose, and clearly it is been replaced, as it has worm clamps on it....it seems to have a restriction at the bend, like mildly kinked. Thought I might replace that. I cleaned the snow screen of a LOT of debris, and also did the air filter. I checked the line that connects under the air filter and it seemed to be fine. I replaced a few short vacuum lines with McMaster Carr stuff I had from my previous vac line swap. Still have not found the problem. Maybe need to try a MAF test, but wanted to run the symptoms by this group to see if there is any insight based on my particular case. By the way, when I say I hear the turbo spool up, I mean, even if there is no boost, I can hear it, so that seems like a good thing. It's a VNT17 with Rocketchip RC3, and also has one EGR mod....I can't remember what it's called, the one that makes it so the intake wont get clogged. Other than that I cannot remember what is done to the car that could affect this...it has T4 nozzles that have probably 150K on them without cleaning or pop test.
