[urq] I'm SO close to giving up - Part 2?

Tue Apr 19 23:38:06 EDT 2005

In a message dated 4/19/2005 12:59:23 A.M. Mountain Daylight Time,  
quattrodude at comcast.net writes:

Ok here  is what I found from the Air/Fuel meter...say at 4th gear..at  3K
rpms...stomp on it..WOT...boost comes up...13psi..Accel good,  fuel
rich...but then starts to lean out at about 4500 and in the red  by
5500...

Last thing I can think of swapping is fuel pump at this  point?

Another $150 bucks...anyone think anything else before I sink  another
$150 into it?

-----Original Message-----
From:  urq-bounces+quattrodude=comcast.net at audifans.com
[mailto:urq-bounces+quattrodude=comcast.net at audifans.com]  On Behalf Of
Ado Sigal
Sent: Monday, April 18, 2005 7:01 PM
Cc: Urq  List; Chaplen, John
Subject: Re: [urq] I'm SO close to giving up

Two  things should be also mentioned. First you should establish what is  
missing at WOT, the fuel or the spark. Spark can be easily checked by  
wiring the flash gun and running it through deliberately miss aligned  
bonnet, and taping it on the windscreen. That would take you on the  
right track.
Second thing to check is the WOT switch operation. On two  occasions I 
found on my ex GV engines, that the switch would close  correctly at 3/4 
throttle, but would open again at close to WOT. After  bending the leaver

slightly, the symptoms similar to yours  disappeared.

HTH,

Ado

>
>Ok....basic  problem...Under "WOT" and boost the car stumbles...back off
>the  throttle just a TAD and car starts pulling strong  again...
>
>What's been done...(not necessarily in this  order)
>
>1 New fuel injectors - all lines checked and  cleaned
>2 fuel Dist checked, but rebuild anyways (with increased flow)  - all
>retested..seems no problem with flow.
>3 Volume test done -  Ok'd
>4 Pressure test done - Ok'd
>5 Back flow from Exhaust - NP  there
>6 Checked for the small filter ...no problem there
>7  checked WOT and IDLE switch..all fine there
>8 new cap, rotor, spark  plugs and wires...
>9 Volt at coil is 13-14 volts
>10 all grounds  clean and tested
>11 Compression check + - 10psi between all 5  cyl
>12 Pulled all 5 plugs, they all look fine, no damage, they all look  the
>same too...clean and right color...(bosch tri-electrodes)
>13  Swapped ECU with known good one...still same problem
>14 checked Waste  gate for torn diaphragm - no problem there
>15 New fuel filters  (twice)
>16 Boost is NOT passing 14 psi (chipped by SJM)
>17  checked all hoses and removed them, they are fine.
>18 I have backed  boost down to less than 9psi still same symptoms
>19 removed full  throttle cable (thinking it might be a full throttle
>mode)  nope..
>20 new and checked the Freq valve for duty cycle looks correct  and can
>hear it working
>21 rebuilt alternator to make sure  voltage/amps were not a problem
>21 car passes DEQ SUPER  clean...
>
>I guess my last question would be that I can think of,  are there any
>sensors that might be bad that would put the car into a  reduced timing
>mode?
>
>I have had Scott Mockery drive the  car, and it's NOT a fuel cut out
>issue (4K cut out).
>
>I  just installed a fuel air meter box Wednesday, but have not had  a
>chance to run it...but from tests at idle with running WOT switch,  it
is
>fully enriching as it should do...
>and running and idle  it's stoich? (sp)...I will be trying to drive it
>this weekend to see if  it's running too lean...But to me at this point
I
>feel like it's a  timing issue?
>
>(NOTE- I have done all of the above to try to fix  this problem)
>
>Any help would be so much  appreciated!!!
>
>
>
>John Chaplen CNE
>Mercer  Human Resource Consulting
>Portland, OR  97204-3693
>
>
>
>
>
>_______________________________________________
>Audifans  urq mailing list
>Send posts to: mailto:urq at audifans.com
>Manage  your list  connection:
http://www.audifans.com/mailman/listinfo/urq
>Have an urq  question?  Check the Audifans  Knowledgebase!
>http://www.audi-quattro.org/cgi-bin/twiki/view/Audi/UrQuattro
>Have  an urq answer? ... Please help others by adding to the KB ...  all
>contributions  welcome!
>
>
>_______________________________________________
>Audifans  urq mailing list
>Send posts to: mailto:urq at audifans.com
>Manage  your list  connection:
http://www.audifans.com/mailman/listinfo/urq
>Have an urq  question?  Check the Audifans  Knowledgebase!
>http://www.audi-quattro.org/cgi-bin/twiki/view/Audi/UrQuattro
>Have  an urq answer? ... Please help others by adding to the KB ...  all
contributions welcome!
>

I feel somewhat vindicated, but still wonder why no one seems to believe me  
on this list.
Lean at WOT. That is what I said a few days ago. I tweaked the FD and my  
problem went away.
Don't waste your money on a fuel pump. I replaced my pump. I relayed my  
pump, I replaced injectors and seals, and did all the things suggested in all  the 
responses here so far, but the only cure was allowing the FD to flow more  
fuel. My mileage went down, but full throttle was great!
I unfortunately never got the chance to go through an emissions test before  
its life was snuffed out to truly tell the tailpipe story.

Dennis
Denver