200 10V stumbles, poor mileage

[John Lagnese]

Check your grounds. If the electrical system needs to ground itself through
the ecu...
John

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of kbogach at comcast.net
Sent: Monday, December 28, 2009 10:25 PM
To: john at westcoastgarage.net
Cc: Ben Swann; Quattro List
Subject: Re: 200 10V stumbles, poor mileage

Does it mean that my 2 ECUs went bad in same way? That would be strange. I
need to trace wiring. I checked voltage when ECU was connected. Maybe
someone before me did a "mod"? 

Konstantine. 

----- Original Message ----- 
From: john at westcoastgarage.net 
To: "Ben Swann" <benswann at verizon.net> 
Cc: kbogach at comcast.net, "Quattro List" <quattro at audifans.com> 
Sent: Monday, December 28, 2009 3:17:29 PM (GMT-0500) Auto-Detected 
Subject: Re: Re: 200 10V stumbles, poor mileage 

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 
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