A cold reading from the temp sensor cam make the ECU go open loop but the
temp would be near 110F. Bad reading from the O2 sensor will make the ECU
try as hard as it can to compensate. This is where you can get runaway
richness. This is especially true on the 2.l Digifant. It has enough
adjustment to so rich the engine can choke and puke and blow black smoke.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Michael Elliott
Sent: Sunday, November 04, 2007 8:08 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Closed-Loop: what's the ECU waiting for?

Thank you, Dennis.

I understand that even after the ECU has gone closed-loop, it will switch
back to open loop if it gets an out-of-range reading from the O2 sensor.
Will it also go back to open loop if it gets a "cold" reading from the
temp sensor?

--
Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR

On 11/3/2007 9:28 PM Dennis Haynes wrote:

> Time running and coolant temperature.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of
> Michael Elliott
> Sent: Saturday, November 03, 2007 1:21 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Closed-Loop: what's the ECU waiting for?
>
> What determines when the Digijet ECU decides to go closed loop to
control
> the air-fuel mixture?
>
> The Digijet Training Manual is not real clear to me on this.
>
> --
> Mike "Rocket J Squirrel" Elliott
> 71 Type 2: the Wonderbus
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> KG6RCR