200 10V stumbles, poor mileage

[Ben Swann]

That does not sound right.

The injector should pulse during startup when the engine is cold. Duration of pulses is dependent upon engine temp.  The pulse is caused by a switching to ground AFAIK - either through the ECU or some other means - depending upon ECU.

There should not be a constant current path on both side of injector terminals. There would be a positive voltage present on one terminal all times and shared with other devices (blue/black wire), but other terminal should not go to ground except through the ECU(pin 1).

That is the way I recall without looking in more detail at the manual or other schematics.

See http://www.gtquattro.com/MCWiring.html for wiring details - MAC-14 is similar.

Ben

-----Original Message-----
From: john at westcoastgarage.net [mailto:john at westcoastgarage.net] 
Sent: Tuesday, December 29, 2009 1:36 PM
To: kbogach at comcast.net
Cc: audi at humanspeakers.com; Ben Swann; Quattro List
Subject: Re: 200 10V stumbles, poor mileage

kbogach at comcast.net wrote:
> To clarify, it is as 12V on the connector, meaning the ECU keeps 
> ground on pin 1 (CSV) all the time when engine runs.
>
> Konstantine.
>
> ----- Original Message -----
> From: "Huw Powell" <audi at humanspeakers.com>
> To: kbogach at comcast.net
> Cc: john at westcoastgarage.net, "Ben Swann" <benswann at verizon.net>, 
> "Quattro List" <quattro at audifans.com>
> Sent: Monday, December 28, 2009 10:54:03 PM (GMT-0500) Auto-Detected
> Subject: Re: 200 10V stumbles, poor mileage
>
>
> >> **** One thing surprised me: why cold start valve is powered all
> the time? Is it
> >> supposed to? ****
>
> The usual way they work is that the ground is switched.  So, yes, it 
> probably gets konstant 12v.
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
Pardon me, but this thread has been going on for a while, and I don't remember what MY the car is.  If you'll tell me that, I'll go to the wiring diagram and put this to rest.  John