200 10V stumbles, poor mileage

[john at westcoastgarage.net]

Ben Swann wrote:
>  **** Switched to ground thru ECU, as is most EFI(pulse modulated)  ****
>
> Ben
> [Date: Sat, 26 Dec 2009 18:10:32 -0500
> From: Konstantine Bogach <kbogach at comcast.net>
> Subject: Re: 200 10V stumbles, poor mileage
> To: audi at humanspeakers.com
> Cc: quattro at audifans.com
> Message-ID: <4B3697E8.3090403 at comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Ok,  I checked rpm, crank position sensors with scope and they look fine, no
> aberrations.
>
> Signal on terminal 1 of the ignition coil look ok to me, meaning that ECU ignition
> function is ok.
>
> Ground to ECU is good.  Air, engine temp sensors are passed resistance check.  Oxygen
> sensor is heated, ECU receives it signal (looks like in range 0.1-0.8 V).  What is left
> to blame are rotor, cap, coil, wires and plugs.  
>
> **** One thing surprised me:  why cold start valve is powered all the time?  Is it
> supposed to?  ****
>
> Thank you.
> Konstantine.]
>
>   
Actually, if it's really a 200 10v, the CSV is controlled solely by the 
thermo time switch and powered up by a wire from the starter solenoid, 
which is hot only when the key is in the cranking position.

John