[urq] Ideas for rough running continued

[Bill Bennett]

Query Ingo
   I have had two Audis in the shop recently, both crap running cold, both 
using the new Shell gas or the stuff from Union 76 and my vw, I changed all 
cars to chevron, all problems gone, the former fuel smelled odd, yeah just 
an oregon opinion. Best, Bill
----- Original Message ----- 
From: "Ingo Rautenberg" <i.rautenberg at waratap.com>
To: "UrqList" <urq at audifans.com>
Sent: Thursday, March 24, 2005 12:32 PM
Subject: [urq] Ideas for rough running continued


OK, fuel pressures check out - system ~90 PSI regulated after warmup 55 PSI.
What's been replaced so far with known goods: ECU, idle valve, fuel 
distributor, warm up regulator.
Fuel flow test 18 seconds 750 ml. Vacuum feed directly from back of IM to 
ECU.
Fuel pump jumpered to run when ignition on regardless.

Ongoing symptoms:

low (600-650 rpm) idle (rough)

When proper duty cycle 45-55% adjustment is made (frequency valve buzzing), 
car will make it out of the driveway (steep) and then up a not-so-steep 
(10-15 degree) incline 200 ft and then stalls and won't restart.  Fuel 
pressures unchanged.  Roll down backwards into driveway (or not), turn CO 
adjustment two to two and a half turns to the right and car starts (every 
time -- but won't idle).  Still runs funny and duty cycle now 5%.

So, I'm thinking replace airflow meter (have feeling it's sticking) or does 
this also sound like it could be a clogged exhaust?  What throws me is that 
I can consistently turn the CO screw to richen the mixture after stalling 
and it will start (but not idle).  Still stumbles, though.  And the soot out 
the back is black/gray.  I was thinking crank/flywheel position sensor might 
be intermittent (wouldn't that suck), but doesn't explain being able to 
start the car when enriching mixture.  Also, have tendency to have backfires 
through air meter...

Ingo (still mit ailing '84 Urq and WX motor)


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.857 / Virus Database: 584 - Release Date: 2/10/2005
_______________________________________________
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!