S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Boost leak, so far i checked this, with no results

Thread Tools
 
Search this Thread
 
Old 10-31-2007, 06:52 AM
  #1  
AudiWorld Member
Thread Starter
 
svenson69's Avatar
 
Join Date: Apr 2005
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default Boost leak, so far i checked this, with no results

Intake leak test
Diverteres changed to 710n
Stock N75 and upgraded N75(switched back and forth)
Intercoolers checked
Brake Vacuum Hose checked
MAF cleaned

The car accelerates and in high RPM the boost comes down form 20psi to about 10 to 12 in every gear. I hear a "wooshing sound" and the car significally looses power. Afer using the car for more than 40 minutes or so, or using air conditioning, the car goes into limp mode.


My next step is to check the actuators, how can I do this?

What else should i check?

Thanks
Old 10-31-2007, 07:01 AM
  #2  
AudiWorld Super User
 
VonK :: Retired's Avatar
 
Join Date: Nov 2000
Posts: 4,219
Likes: 0
Received 0 Likes on 0 Posts
Default

Are you leak testing at 20 PSI?
Old 10-31-2007, 07:01 AM
  #3  
AudiWorld Expert
 
S4gasm (LoTR)'s Avatar
 
Join Date: Jul 2004
Posts: 30,052
Likes: 0
Received 0 Likes on 0 Posts
Default

if u can hear it blowing off, u have a leak. Pressure test again.
Old 10-31-2007, 09:15 AM
  #4  
AudiWorld Member
Thread Starter
 
svenson69's Avatar
 
Join Date: Apr 2005
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default

The tester poped off at about 15PSI, I used the AWE document as a guide
Old 10-31-2007, 09:50 AM
  #5  
AudiWorld Super User
 
VonK :: Retired's Avatar
 
Join Date: Nov 2000
Posts: 4,219
Likes: 0
Received 0 Likes on 0 Posts
Default

It may take 20 PSI to open up the leak, like whn you run at max boost.
Old 10-31-2007, 09:57 AM
  #6  
AudiWorld Senior Member
 
pitchS4's Avatar
 
Join Date: Aug 2006
Posts: 1,439
Likes: 0
Received 0 Likes on 0 Posts
Default

Tie the tester it onto the y-pipe with a rope perpendicular to the clamps
Old 10-31-2007, 10:10 AM
  #7  
AudiWorld Member
 
KeithO's Avatar
 
Join Date: Aug 2000
Posts: 522
Likes: 0
Received 0 Likes on 0 Posts
Default

TBB
Old 10-31-2007, 12:38 PM
  #8  
AudiWorld Super User
 
Nigel (no more S4)'s Avatar
 
Join Date: Jul 2004
Posts: 4,837
Likes: 0
Received 0 Likes on 0 Posts
Default

tighten it more. Mine holds 20psi without a problem
Old 10-31-2007, 12:54 PM
  #9  
AudiWorld Member
Thread Starter
 
svenson69's Avatar
 
Join Date: Apr 2005
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default

I have a new Samco installed, same results, leak
Old 10-31-2007, 12:55 PM
  #10  
AudiWorld Member
Thread Starter
 
svenson69's Avatar
 
Join Date: Apr 2005
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default

OK, will try that today and post the results


Quick Reply: Boost leak, so far i checked this, with no results



All times are GMT -8. The time now is 09:54 PM.