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Thread: 2005 Caravelle Under boost issue

  1. #1
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    2005 Caravelle Under boost issue

    I have an under boost issue on my 2005 Caravelle T5 T30 2.5 TDI. I'm getting approx 28 showing on my pressure gauge at the pump and the inlet side of the N75 valve and about 18 on the outlet( to the turbo.)

    My question is :is this enough of a difference in pressure to cause under boost and a limp mode to kick in?
    2005 Caravelle T5 T30 2.5 TDI

  2. #2
    Administrator Keithuk's Avatar
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    You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

    Post moved to correct section as it isn't a general question.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  3. #3
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    Thanks for that👍

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    Administrator Crasher's Avatar
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    The 3mm hoses on the N75 valve circuit carry a vacuum from the cylinder head mounted vacuum pump for the brakes.
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  5. #5
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    Thank you crasher.
    Do you think then that my pipework may be set up wrong.The van has never ran properly since I bought it to be honest.required a new turbo when i bought it.
    .anyone with a sciatic drawing of the pipe layout that they can send me please

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