[s-cars] Drastic Power Loss-So far No Joy

[QSHIPQ at aol.com]

Manny
The first test is to replace WGFV with known good.  I've never done a  
resistance ck on a WGFV, they can be intermittent, sending you down a really  dumb 
diagnostic tree, toss a good one in there and ck it out.  Second is to  remove 
the WGFV from the equation (route the feed line from the turbo  directly to 
the WG), the car should peak at spring pressure (if stock,  that's 1.3bar).  
Third would be to remove the WGFV feed line at the bottom  of the WG (plug the 
turbo side).  This should give you overboost  shutdown on the first run (I don't 
recommend this one early in the diag  game).   Resitance test to the WGFV can 
be valid and still have  the boost problem IME, especially if you are looking 
for the WGFV to perform at  27psi.    
 
Personally, I'd hold off all further testing until you can put a known good  
WGFV into the car.  I see this problem all the time on 1991>present  turbo 
audis.  The RS2 is the studiest WGVF of the group, but it still fails  regularly 
when hit at 25psi+ pressures.  The symptoms are exactly as you  describe.  
 
My reiteration of my o2 arbitraged thru the peso
 
Scott Justusson
In a message dated 9/23/2007 11:18:50 A.M. Central Daylight Time,  
manuelsanchez at starpower.net writes:

Chris,  didn't see any obstruction in that WGFV to Wastegate line. We  
pulled  it and swapped components from another UrS and had the same  
cut-off  result.

We also tested the wastegate diaphragm with a vacuum pump, and  it  
held the pressure.

We are also planning on seeing what the  fuel pump is doing at the  
time of cut-off as Stott and DJ have  suggested.

Taka, after further investigation I've discovered that only  the  
resistance/continuity was checked on my WGFV. I have a new stock  WGFV  
on special order. Haven't tried just disconnecting the WGFV  and  
plugging the line on a test drive yet either.

Thanks  again to all of you for the suggestions and experiences. If  
you have  anymore, please send them my  way.

Regards,

-Manny







************************************** See what's new at http://www.aol.com