A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Boost problems, can someone help?

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Old Jan 21, 2002 | 08:07 PM
  #1  
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Default Boost problems, can someone help?

first off i notice that when flooring second gear and third sometimes my boost gauge needle starts to drop in pressure well @ full throttle till redline, is that normal (seems like it's bleeding)? i purchased a forge valve and thought the problem would go away, but it still happend.

secondly, i notice only when i cosistintly go into boost, my boost will cut in half and limit itself, instead of it going to 1.0psi like normal, it will only go to 0.5psi.
Now the weird thing is if i restart the car, it will boost back up to 1.0psi.

MODS:
giac chip
exhaust
hks power flow
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Old Jan 21, 2002 | 08:09 PM
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Skene @ PES Tuning's Avatar
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Default you could quite possibly be going into limp mode..

you could have a blown hose... get it checked.
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Old Jan 21, 2002 | 08:29 PM
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sorry, but whats limp mode?
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Old Jan 21, 2002 | 08:33 PM
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Default

limp mode would be with NO boost, right?
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Old Jan 21, 2002 | 09:09 PM
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has ne1 else had these problems?
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Old Jan 21, 2002 | 10:15 PM
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Default No, limp cuts the boost down to 5-7 psi. From what he is saying it is limp mode.

Because it resets back to normal when he turns off the car.
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