[urq] Ideas for rough running continued

[DGraber460 at aol.com]

In a message dated 3/24/2005 3:35:56 P.M. Mountain Standard Time,  
james.pasqualoni at gs.com writes:

Just  throwing it out there since I don't recall seeing it:  How about  spark
to all cylinders under 3k RPM?  Have you tried swapping in a  known good
distributor?  Other ignition components?  When cold,  does the car start in a
similar timeframe as before, or does it require  more cranking than normal?
How about when warm?  

-----Original  Message-----
From: urq-bounces at audifans.com  [mailto:urq-bounces at audifans.com] On Behalf
Of Brandon Rogers
Sent:  Thursday, March 24, 2005 5:16 PM
To: Urq List; Ingo Rautenberg
Subject:  Re: [urq] Ideas for rough running continued


Are you sure you  pressure tested properly?- seems to be load-related, no? 
Which would seem  to steer away from intermittent electricals, right?  Maybe 
it is  clogged kittty-  might as well pull it off and see...

oh wait - i  just re-read - you do make it up the two hills- so does it 
always stall in  the same place? - have you tried letting it idle for a long 
time to really  warm it up first...

just trying to jar a thought out of the  noggin....

I guess I'm looking for some sort of pattern - load related,  temp 
related....???

how does the motor sound going up the  hill?  hissing? sputtering? 
backfiring?

anything?  anyone?anyone?

Brandon



----- Original Message -----  
From: "Ingo Rautenberg" <i.rautenberg at waratap.com>
To: "UrqList"  <urq at audifans.com>
Sent: Thursday, March 24, 2005 1:32 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)





Sounds like a classic closed/open loop issue. Once it warms up and switches  
over, things go bad. I would let it idle for about 10 minutes or till the fan  
runs, and see if it acts up.

 
Dennis
Denver