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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old November 14th, 2014, 14:22   #151
MikeB4
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Join Date: Apr 2005
Location: Irvine, CA, USA
Fuel Economy: 48/42/38
Default Found a cracked hose

Quote:
Originally Posted by rdkern View Post
It's not just being stuck, it's the N18 valve not doing it's job.

But if that code's gone, you might have fixed it.
OK, I'm getting there, one problem at a time. I was following the EGR troubleshooting steps, and indeed my upper breather hose from the CCV puck to the intake was split around the hose clamp. Unfortunately, I didn't see that one from any of the TDICLUB vendors, so I went and paid full dealer retail price! $60 for 6 inches of hose. Awesome.

I thought that I may have been sucking in un-metered air, and that's why my MAF actual was always over 400 when requested was 340 (yes, I do have the EGR adaptation value changed up).

The next thing I noticed was that the vacuum to the EGR diaphragm was very weak after blipping the throttle in the EGR diagnostic steps. My vacuum pump / guage was broken, so I didn't have one at the time. I just bought a new one so I'll look at it more this weekend, because I then noticed the recirc door is no longer working. Maybe there is a leak somewhere from my primary vacuum pump if neither is working. How much vacuum should the EGR pressure converter allow to the EGR diaphragm anyway?

P.S. It's getting cold up here in Indianapolis. If someone from the South wants to buy this B4V, I'm sure it will be happy to move to warmer climates!
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Old November 15th, 2014, 16:26   #152
MikeB4
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Default Success!

Quote:
Originally Posted by rdkern View Post
It's not just being stuck, it's the N18 valve not doing it's job.

But if that code's gone, you might have fixed it.
I made significant progress today. I confirmed that I was getting vacuum to the N18, but never through it, even after blipping the throttle. I took it out, sprayed silicon through it, tapped it on the floor a few times, and cleaned the electrical connector with electrical contact cleaner. Now, I do get vacuum to the EGR valve as expected!

Next, I sprayed about half of a can of MAF cleaner on the MAF, and cleaned it's electrical contacts as well. Now, my MAF actual readings do follow the MAF expected at idle, low speed throttle, and even full load! It seems like my power is back, too!

I'll keep y'all updated as I drive it more.
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Old March 13th, 2015, 16:42   #153
Houpty GT
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Location: South Carolina
TDI(s): Corrado
Fuel Economy: 56 avg.
Default

I am trying to fix my boost issue. The wastegate and turbo seem to work fine. The wastegate opens at 10 psi and the turbo will boost over 20 psi if the blue hose is disconnected. I have tried another used N75 and bought a new N75 also. All the hoses hold pressure and are connected properly with the turbo hose going to the connector side of the N75 and the wastegate hose going to the side port.
The problem I have found is that the psi in the blue hose exactly matches the manifold pressure. The engine builds boost to 10 psi and then the wastegate pops open. I have checked the voltages on the N75 connector and I get the expected 12 volts and 6 volts. I am planning to log the N75 duty cycle this weekend and maybe the MAF. I tried running the car with the MAF disconnected, tried a different tune and ECU and got no change. Any ides what is causing this?
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Old March 14th, 2015, 10:25   #154
rdkern
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That sure sounds like either the N75 is stuck open, or the tube routing is wrong.

The blue hose goes from the side connector on the N75 to the Wastegate.

The red hose goes from the "end" nipple furthest from the blue hose to the turbo boost side.

The black hose goes from the end nipple closest to the blue hose to the filtered air hose near the air filter. Right? Swapping the black and red hoses will also cause what you are describing.

Logging the activity won't hurt.
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Old March 15th, 2015, 18:50   #155
Houpty GT
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Default

It was the black hose on the N75. Turns out there were no leaks but it was clogged with a gummy black tar. Must be something with the silicone and the oil. The hose not being able to vent to atmosphere caused the pressure to build in the blue hose. Lots of power now!
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