[urq] Ideas for rough running continued

[Ingo Rautenberg]

I wish.  Thought about that, too.  Various fillups with different brands
didn't change a thing.  Ran Techron in just before the last fill up as well.

Ingo (I'll be happy when I've figured it out)

----- Original Message ----- 
From: "Bill Bennett" <ur.quattro at verizon.net>
To: "Ingo Rautenberg" <i.rautenberg at waratap.com>; "UrqList"
<urq at audifans.com>
Sent: Friday, March 25, 2005 2:07 AM
Subject: Re: [urq] Ideas for rough running continued


> 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)
>
>
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