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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old August 5th, 2017, 10:45   #1
Stephen03tdi
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Location: New-Brunswick, Canada
Default Turbo question...

So had this car for a couple of months and keep finding new things. I noticed these two green hoses are conected and has to do with the turbo.

https://ibb.co/m8yPMa

But on the right side theres nothing, and seen another hose, unplugged going in my car and in the boost guage. I hooked it up and it seemed to be working fine ( the boost cage and turbo ).

I took out to the rood and the engine started to choke and a big cloud of white smoke came out. As soon as I unplugged it, the engine worked fine as did everything else.

Could something simply just be stuck in that tube?
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Old August 5th, 2017, 11:17   #2
flee
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You may have basically plugged it by connecting to the gauge.
The missing hose on the right side of the N75 should go to the airbox.
As long as is remains missing unfiltered air will contaminate the N75 and pump.
Also there will be a small unfiltered air leak into the engine's intake stream.
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Old August 5th, 2017, 18:36   #3
Stephen03tdi
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Okay. Was like that when I bought it. Would there be a solution? Could it cause worse problems?
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Old August 6th, 2017, 15:11   #4
flee
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It's more like a long-term reliability problem so I would replace that hose soon.
While you're at it make sure the vacuum hoses are hooked up right.
Is there a hose barb on the intake manifold or hoses for that boost gauge?
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Old September 13th, 2017, 14:08   #5
Stephen03tdi
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Sorry for the late reply... and sorry but i'm a little new to cars. But I took some pictures if it helps.

https://ibb.co/bYcREF
https://ibb.co/ds6xMv
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Old September 13th, 2017, 19:08   #6
wonneber
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There are 2 similar vacuum valves like in your picture, the other controls the ASV on the EGR.
The same fitting on both valves go to a vacuum tee and the 3rd port from the tee to the air filter bottom.
Make sure the hole going into the air box is open.
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Old September 14th, 2017, 08:16   #7
Stephen03tdi
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Okay.. where should i put my hose coming from my boost guage?
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Old September 14th, 2017, 09:02   #8
Nevada_TDI
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Downstream of the EGR valve in the intake manifold is where I have mine.
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Old September 14th, 2017, 19:19   #9
wonneber
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When I cleaned my intake manifold I drilled & tapped it over the cylinder 4 runner.
Only thing I get a buzzing in the gauge at low boost for about 2 months then it stops.
A bit of black stuff builds up in the fitting hole and seems to smooth's it out.
They also make a filter for that.
I don't think you would have that problem if you put a fitting in the plastic boost hose.
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Old September 14th, 2017, 19:56   #10
Nevada_TDI
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My boost gauge buzzed like crazy until I took the cotton from a q-tip and stuffed it in the inlet side of the gauge. It has been months and the gauge still works great and it does it silently.
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Old September 14th, 2017, 21:15   #11
Stephen03tdi
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I did hook it up but got some buzzing sound too. Ill try cleaning it.
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Old September 15th, 2017, 10:33   #12
flee
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The dirt or cotton restricting the boost gauge hose is what reduces the buzzing.
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Old September 15th, 2017, 19:32   #13
wonneber
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Quote:
Originally Posted by Nevada_TDI View Post
My boost gauge buzzed like crazy until I took the cotton from a q-tip and stuffed it in the inlet side of the gauge. It has been months and the gauge still works great and it does it silently.
Think I will try that next time I take it apart.
I never changed the light in it for a brighter one.
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