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Discussion Starter · #1 ·
So my Passat has recently started accelerating funny, at part throttle the turbo seems to have a mind of its own sometimes it wants to make boost and other times it takes a vacation. Very spotty even at a steady pace. Needle on the boost gauge is all over the place at half throttle, but when at 75%-100% the car makes about 9psi like it should.(not throwing codes) Starting to drive me nuts feeling it cut in and out all the time. Any info is appreciated.
 

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Before asking any questions, one must do some light investigative work, first. Pop the hood, inspect all vacuum lines. Look over anything with a hose, check valve, or any other electronic valve connected for tears, cuts, or looseness.

Were your previous problems cleared up before this one?
Have you run any injector cleaner through it?
Cleaned the throttle body?

BTW, a B5.5 should be making about 11psi at full throttle.
 
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Discussion Starter · #3 ·
I checked all vacuum lines and found a torn one off the intake manifold, after I replaced it the car stopped throwing the p0171 code. Then did a smoke test and checked every line,no leaks were found. Ran injector cleaner through it when I bought it.
 
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