A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Boost Leak Continues...

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Old Mar 25, 2006 | 01:49 PM
  #1  
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Default Boost Leak Continues...

This morning's Boost Log:

<img src="http://pictureposter.audiworld.com/45027/boost.jpg">

I just finsihed an oil change and Replacing the diverter Valve with a 710N. I went back over the PCV hoses, nitril lines, and double checked IM bolt torque (10 Nm), Fuel Rail torque (10 Nm), and made sure the 710n was sealed up as well.

After a warmup drive (30 min to the store and back) I logged the following data:
<img src="http://pictureposter.audiworld.com/45027/boost_leak.jpg">

Boost leak persits. I'm getting a bit frustrated at this point. What other culprets could there be? I'm getting a Snub Mount this week, so while I have the Lock Carrier in service mode I'll inspect the Turbo inlet and outlet hoses as well.
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Old Mar 25, 2006 | 01:52 PM
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Default so whats been done?

has the PCV been replaced?

do you have a block 003 log?

what about a CAPS time?

what are your short term and long term fuel trims?
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Old Mar 25, 2006 | 01:55 PM
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i had a nasty boost leak where i was losing 5 psi then dropping.ended up being thewastegate actuator
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Old Mar 25, 2006 | 01:57 PM
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log 003-- and you can inspect the outlet hose by pulling the splash pan...
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Old Mar 25, 2006 | 01:59 PM
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Default When logging 003 what are the variables?

Do I need to be in 3rd? WOT? any particular rev range?
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Old Mar 25, 2006 | 02:01 PM
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Default do a caps run. 3rd gear WOT from 3800-6500

the main variables are maf flow (g/s) and throttle angle&lt;-important to see if you have throttle cut
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Old Mar 25, 2006 | 02:03 PM
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Default for the fuel trims, you dont need to log it, just connect vag-com and go to block 032

and write down the two numbers. GO!<ul><li><a href="https://forums.audiworld.com/vag/msgs/456.phtml">https://forums.audiworld.com/vag/msgs/456.phtml</a</li></ul>
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Old Mar 25, 2006 | 02:03 PM
  #8  
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Default This was where my boost leak was (BWW)

On the firewall side of the IM:

<img src="http://www.matafied.net/images/DSC01958.jpg">
<img src="http://www.matafied.net/images/DSC02008.jpg">
<img src="http://www.matafied.net/images/DSC02010.jpg">
<img src="http://www.matafied.net/images/DSC02011.jpg">

New hose:

<img src="http://www.matafied.net/images/DSC02018.jpg">
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Old Mar 25, 2006 | 02:24 PM
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See, I havent seen any oily residue anywhere near the PCV hoses indicating a tear or leak...
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Old Mar 25, 2006 | 02:26 PM
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-4.7% and 14.8%
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