she starts, she won't run - 1990 200QA Update 2

[Ameer Antar]

Glad to hear you got the car running. Do you know what caused the mixture to go
full lean? Normally, the mixture is fairly stable. To me, a sudden shift like
that would mean something came loose and introduced a vac. leak. The fault code
you got might be pointing to that as well. An easy test is to pull the oil cap
off and see if the engine stalls. If not, you probably have a leak somewhere.
good luck.
 
-Ameer 

-------------------- Original Message --------------------
From: quattro-request at audifans.com
To: quattro at audifans.com
Date: 1/24/07 12:00:02 PM
Subject: quattro Digest, Vol 39, Issue 72


> Date: Wed, 24 Jan 2007 08:58:08 -0500
> From: "David Michael" [adavidmichael at gmail.com]
> Subject: she starts, she won't run - 1990 200QA Update 2
> To: quattro at audifans.com
> Message-ID:
>     [a8fd8d050701240558w1bf7e5edl7bd4fd8a0eb8af33 at mail.gmail.com]
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Well, as was suspected, it seems that the problem was something simple.
> Trivial actually. I decided to check the basics first.
>
> So I went out last night and clamped a 250 watt halogen work light to
> the edge of the open hood . Wow, daylight. Anyway after getting the car
> started (15 to 20 tries), and letting it warm up, I checked the basic ox
> sensor freq valve duty cycle and ISV current settings. The ISV was close
> (400mA vs specced 430), but the ox sensor duty cycle was pegged at full lean
> (90%). I adjusted it down to to 40-50%. It's not as steady as it should be,
> but at least I could rev the engine w/o it choking.
>
> This morning it was 25 degrees out at 6:00. Car fired, ran and idled
> perfectly. I will not pronounce it fixed until I retest at 10 degrees
> (coming Friday) and see that it drives OK.. I also have to track down the
> cause of error code 2221 - "no manifold pressure signal". The dash gauge
> works fine, and I THINK that's the same sensor the MAC-14 uses (anyone
> know?), so I am a bit confused.
>
> Thanks for the encouragement......
>
> Dave
> 90 200 qa 216 k - off life support
>
>
> ------------------------------