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Thread: 2004 t5 2.5tdi axd boost issue.

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  1. 2004 t5 2.5tdi axd boost issue. 
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    hi everyone.
    As the title suggests i have a boost issue with my new t5. i brought the vehicle with the issue, its flat when driving, no power and worst no boost.
    the vehicle has had all the usual new turbo, maf, map, vacuum control valves, intercooler, fuel filter etc
    underboost code present when i bought it. i have come to check the induction side for boost leaks etc and its reading negative boost pressure when reving the engine. going from 1010mbar at 1000rpm to 900mbar at 2500rpm. checked for any blockages and no fault found on the induction system, turbo spools up with boost pipe off creating plenty of pressure and have used mtty vac to create pressure on the sensor and vaccum both reading correctly on live data through the launch that i have.
    question is have any of you come across this issue before?
    regards
    matt
     
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  2. Re: 2004 t5 2.5tdi axd boost issue. 
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