Another Boost Problem of course.

[looseboost]

Just like every 1 else with a s4... having problems with boost..
No boost gauge pickign 1 up soon
PRessure tested and did not hear any leaks
replaced DV's brand new TT Dv's
No unusuall sounds from the turbos

My car is stock with a GIac chip it ran very quick for the first week i had it. One day it just felt like it wasent boosting as hard as before. How could i tell if the N75 Valve needs to be replaced. I have 90k Miles and it has never been replaced before.
Any ideas Please let know.
Im pressure testing again tonight just to make sure but please dont say " YOu need a boost gauge" or " Pressure test' cuz obviously i know this .. i want more info on if this could be caused by the N75

[The_Jerbel]

You need to VAG the car. You could be in limp mode without even knowing it.

[looseboost]

Ok how does the car get into limp mode and can it be cleared by the vagcom??

[The_Jerbel]

There are several ways the car can go into limp mode. Depending on what the problem is, yeah, you can usually clear it with VAG com.

[looseboost]

hmm ok thanjks for quick responses as always jerbel
my car will be getting vagcommed tonight

[MavSBM]

Keep us posted!

[looseboost]

got my car scanned by my friend on here i can post the logs when he sends me them but there was really No codes that looked terrible just the Egt or w.e sensor. One question is it hard to find the T fitting for the boost guage from a autopart store??

[mistert396]

No its not hard to find the T fitting at all. I found mine in an Advanced Auto. It should be in the area where the silicone hoses are.

[The_Jerbel]

What codes did your car throw? EGT? That can cause a definite loss of power. Also, what is the w.e sensor?

[looseboost]

No i just meant the EGT sensor Lol where is it located and how hard is it to get to??

Edit
Found this http://www.audiworld.com/tech/eng73.shtml
This can reallly cause powerloss? how??

[looseboost]

here is the log

Address 01: Engine Labels: 078-907-551-AZA.lbl
Part No: 8D0 907 551 M
Component: 2.7l V6/5VT G 0002
Coding: 06711
Shop #: WSC 63351

2 Faults Found:
17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus
P1453 - 35-00 - -
18058 - Powertrain Data Bus: Missing Message from Instrument Cluster
P1650 - 35-00 - -
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8D0-907-389.lbl
Part No: 8D0 907 389 E
Component: ABS/ESP allrad D46
Coding: 04395
Shop #: WSC 06435

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: Redir Fail!
Part No: 8D0 820 043 P
Component: A4 KLIMAAUTOMAT D58
Coding: 00160
Shop #: WSC 06435

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8D0-959-655-AI8.lbl
Part No: 8D0 959 655 G
Component: Airbag Front+Kopf 1002
Coding: 00304
Shop #: WSC 06435

1 Fault Found:
01217 - Side Airbag Igniter; Driver Side (N199)
32-10 - Resistance too High - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8D0-920-xxx-17.lbl
Part No: 8D0 920 980 R
Component: B5-KOMBIINSTR. VDO D12
Coding: 02264
Shop #: WSC 06435

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 8D0-862-257.lbl
Part No: 8L0 862 257 N
Component: CV-Pump D11
Coding: 16140
Shop #: WSC 06435

11 Faults Found:
01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01372 - Alarm triggered by Door Contact Switch; Rear Passenger Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01369 - Alarm triggered by Hood Switch
35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
35-00 - -
01366 - Opened Due to Crash Signal
35-00 - -
01365 - Lock/Unlock Switch; Interior
29-00 - Short to Ground
00991 - Interior Lights
28-00 - Short to Plus
00956 - Key 2
09-00 - Adaptation Limit Surpassed

-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 4B0-951-173.lbl
Part No: 4B0 951 173
Component: Innenraumueberw. D03
Coding: 00101
Shop #: WSC 06435

No fault code found.

-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 4B0-907-357-AUT.lbl
Part No: 4B0 907 357
Component: LEUCHTWEITEREGLER D004
Coding: 00012
Shop #: WSC 06435

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8D0-035-1xx-56.lbl
Part No: 8D0 035 195 A
Component: Radio D00
Coding: 00110
Shop #: WSC 06435

No fault code found.

End ---------------------------------------------------------------------

[looseboost]

17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus

Is this the driver side or the passanger side??

[The_Jerbel]

Passenger side...

[looseboost]

thank you should it be fine if i just treplace that 1 without replacing the other i dont have 600 to spare wish i did

[The_Jerbel]

Yes, and I can help you find an EGT for much less than 600. Email me about it.

[looseboost]

pmed

[looseboost]

just set up my boost guage i have a stage 1 on giac chip the boost guage goes up to about 13 and holds there so im guessing that i have no boost leaks that the sensor just needs to get changed

[Mattgfx]

thats really low for being chipped.

[Jayco88]

thats really low for being chipped.

yep, i get 15psi with apr.

[looseboost]

hmm what should i be hitting with a GIAC chip??? mayb its because of the EGT sensor??

[tike0rz]

hmm what should i be hitting with a GIAC chip??? mayb its because of the EGT sensor??

I'd spike at 17 and taper to 15 with the GIAC. Hot days though would only produce like 13-14psi.

[looseboost]

hmm it was hot yesterday i guess but idk because i have felt the car is alot slower then when i first got the chip

So what should i look into other then the EGT ?? Can that be causing boost loss??
N75?
I will pressure test again tonight or tommorow just in case i missed something but i highly doubt it

[AudiSportB5S4]

back when i had GIAC. i would spike to about 19, holding 15-17.

[looseboost]

Ugh =(
again, could the boost loss be because of the EGT?

[The_Jerbel]

yes, but it probably wouldn't be consistent at all.

[looseboost]

Could the n75 also be a problem ??

[Mattgfx]

come to the meet tonight. ill bring my computer. get a new EGT sensor . that is a big part of building boost up and keeping the car running correctly ..

you should be spiking at 18psi and holding at 16-17 .. i have giac also.

[looseboost]

come to the meet tonight. ill bring my computer. get a new EGT sensor . that is a big part of building boost up and keeping the car running correctly ..

you should be spiking at 18psi and holding at 16-17 .. i have giac also.

I am supppose to be buying a sensor tonight.. its the driver side but i just read that they are interchangable??so if i have it in in time im gonna come threw i feel awkward cuz i dont no any 1 there.

[Mattgfx]

I am supppose to be buying a sensor tonight.. its the driver side but i just read that they are interchangable??so if i have it in in time im gonna come threw i feel awkward cuz i dont no any 1 there.

you know me . haha.. if you come one time u will know everyone and it will be cool.. Im the only B5 s4 that goes most of the time.. unless i call some of my buddies up. Marc sometimes shows also..

let me know if you gonna come or not txt me

[looseboost]

Ill pm u my number
call me tonight when ur around there
no point in scanning my car unless i find that damn sensor then we can see wuts up.. if its not the sensor its gotta be a boost leak or the n75..

[looseboost]

Boosted 15 pounds out of nowhere yesterday??
Goes to 13 or 15 sometimes.
N75 or weather related ??

[VinNyS4]

is there any way to tell if the n75 is no good?

[AudiSportB5S4]

is there any way to tell if the n75 is no good?

if you have access to VAG you can log the duty cycle... if its erratic that usually means its dead... im drawing a big blank on the block in VAG for it though sorry!