S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

5psi of boost....intermitten.....whats wrong?

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Old Jun 3, 2006 | 09:26 PM
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Nogaro Stg3's Avatar
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Default 5psi of boost....intermitten.....whats wrong?

every one and a while my car will only boost 5 pounds, then the problems seems to go away on its own. only happends once in a while and only lasts for a half hour....

whats going on?

TIA
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Old Jun 3, 2006 | 09:28 PM
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Default Seems like your going in to limp mode

I would pressure test and check IC hoses.
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Old Jun 3, 2006 | 09:33 PM
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i thought limp mode was 7 psi.???
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Old Jun 3, 2006 | 09:34 PM
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boost leak, EGT sensors failing, check both
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Old Jun 4, 2006 | 05:39 AM
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that is stock boost :x
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Old Jun 4, 2006 | 05:39 AM
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^^ 2-nd.
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Old Jun 4, 2006 | 05:40 AM
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how hard is it to replace EGTs when the motor is in?
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Old Jun 4, 2006 | 05:41 AM
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how do you check the EGTs
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Old Jun 4, 2006 | 05:59 AM
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Default vag .. my friend has G235 (pass side sensor 1) bad - code :"implausible signal"

it went a few times in limp-mode @ wot.
check for codes in the ecu.
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Old Jun 4, 2006 | 06:00 AM
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Default not hard at all .. pass side from up above and the dr side from underneath

Steve Trac wrote a while back a nice thread about replacing both of these .. so search for it.
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