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underboost

  1. VW T5 2.5TDI BPC underboost problem

    General Diesel Discussion
    Hello everyone. Ive just swapped out the engine in my newly bought 2008 T5 due to turbo failure on the old engine. Old engine was a BNZ, new is BPC. Story is; some guy went to one of the best mechanic in town, and he told him the car had a turbo failure. I bought the car real cheap, and got a...
  2. Underboost...now overboost

    VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum
    I have a Passat with the AWX 130 PD engine. Has been going into limp mode for a while now and had been showing fault code for underboost. It got a new tandem pump, new N75 valve, reconditioned turbo (at which point the EGR was deleted). None of this made any difference and was still showing...
  3. A3 2.0 TDI 140 Turbo underboost issue

    Mk5 VW Jetta, Sportwagen, and Audi A3 TDI forum
    Hi, my 2006 A3 2.0 TDI 140 turbo won't boost - unless I remove the pipe that comes out of the vacuum reservoir - in which case it boosts well. I've spoken to local garages, several Audi technicians and turbo specialists and no one has been able to provide an answer as to why it will only boost...
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