Wats wrong with my vacuum

**s4me808** · 05-09-2008 03:03 PM

its my boost I have a vdo boost gauge hooked up which used to work fine but not to long ago it just stop read boost but I can feel it boosting fine even with the vagcom it was reading 20psi but nothin. On the guage I tried a different gauge but same thing we changed the line and same
any idea
if if it helps I'm running turbo smart dv and it seems to run a o k

**Rated S** · 05-09-2008 03:14 PM

Originally Posted by s4me808

its my boost I have a vdo boost gauge hooked up which used to work fine but not to long ago it just stop read boost but I can feel it boosting fine even with the vagcom it was reading 20psi but nothin. On the guage I tried a different gauge but same thing we changed the line and same
any idea
if if it helps I'm running turbo smart dv and it seems to run a o k

Maybe the T-Fitting shat out.
I had to replace mine for it to work again.

**AudiSportB5S4** · 05-09-2008 04:57 PM

yeah probably something stupid like that. that or your gauge... not too many possible cuases for this one. id go under the hood make sure the T didnt slip out of the hoses, although i would expect if you're normal to feeeel the choppy idle that would occur from that...

**s4me808** · 05-10-2008 12:54 AM

I'll check it out tomarrow
but it does idle a little choppy
Wat about the hose that goes to the metal hose doesn t it suppose to be sucking air

**AudiSportB5S4** · 05-10-2008 04:35 AM

the hose that goes to the metal hose? are you talking the back of the motor driver side near the fuel pressure regulator? idk but take a look i circled the area where MY boost gauge reads pressure and as does many...

make sure those lines didnt pop off the back of the engine or just check the T, if everything is A OK then replace the T maybe. make sure the lines are tight though, i replaced mine as you can see, all my vacuum hoses for the most part i upgraded since the stock flaky cloth gets old. especially when you cut it in half for the install. i replaced both ends also at the motor

**s4me808** · 05-10-2008 08:38 PM

Thanks bro

**Overboostin** · 05-10-2008 09:07 PM

check to see if the hose popped off the t as well.

**s4me808** · 05-11-2008 12:59 AM

Originally Posted by AudiSportB5S4

the hose that goes to the metal hose? are you talking the back of the motor driver side near the fuel pressure regulator? idk but take a look i circled the area where MY boost gauge reads pressure and as does many...

make sure those lines didnt pop off the back of the engine or just check the T, if everything is A OK then replace the T maybe. make sure the lines are tight though, i replaced mine as you can see, all my vacuum hoses for the most part i upgraded since the stock flaky cloth gets old. especially when you cut it in half for the install. i replaced both ends also at the motor

wassp found the problem
audisport was correct but mines looks different I'll try to get a pix up
btw were can I get that fitting

**AudiSportB5S4** · 05-11-2008 04:20 AM

+1 AZ Help point. lol, go to any auto store they'll have T fittings of multiple sizes probably in an assortment

**s4me808** · 05-11-2008 10:26 AM

Originally Posted by AudiSportB5S4

+1 AZ Help point. lol, go to any auto store they'll have T fittings of multiple sizes probably in an assortment

So it doesnt matter wat kind I need because it looks different from yours

**Daft** · 05-11-2008 11:38 AM

Most likely, the vacuum line for your fuel pressure regulator (silverish cylinder with vacuum line connection) is 3mm inner diameter. Most auto part stores still only sell American sizes (fractions of an inch). The closest diameter vacuum hose to 3mm is 3/16". So if you get a new vacuum tee fitting, get one that accepts 3/16" on the two sides and something to match the line that feeds your gauge.

Is this connection totally broken off? If it is, you should stay out of WOT until it's fixed, your fuel pressure regulator needs the pressure that the vacuum line supplies to maintain fuel pressure at high RPMs. Running WOT with a fuel pressure regulator still at base pressure setting (meaning no vacuum hose) will run the car dangerously lean.

**s4me808** · 05-11-2008 12:05 PM

Originally Posted by Daft

Most likely, the vacuum line for your fuel pressure regulator (silverish cylinder with vacuum line connection) is 3mm inner diameter. Most auto part stores still only sell American sizes (fractions of an inch). The closest diameter vacuum hose to 3mm is 3/16". So if you get a new vacuum tee fitting, get one that accepts 3/16" on the two sides and something to match the line that feeds your gauge.

Is this connection totally broken off? If it is, you should stay out of WOT until it's fixed, your fuel pressure regulator needs the pressure that the vacuum line supplies to maintain fuel pressure at high RPMs. Running WOT with a fuel pressure regulator still at base pressure setting (meaning no vacuum hose) will run the car dangerously lean.

thanks bro no wonder It feel slugish at hi rpm top