Date:         Fri, 1 Feb 2008 10:33:58 -0800
Reply-To:     Mark Keller <kelphoto@TELUS.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Keller <kelphoto@TELUS.NET>
Subject:      ECU high idle
Comments: To: eduntz@HOTMAIL.COM
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi,

I'm experienced with the fuel injection setu on digifants.  I thought
the 87 was such. If so the idle stabilizer is in the ECU, and the idle
air motor is all that's in the engine bay.

As far as useful information, The ECU operates on assumptions, like fuel
pressure.  For a good read, try searching the archives unde my email,
just kelphoto.  Look for how to setup the base fuel injection and you
can see what controls you have, like idle air bypass, spring tension,
and CO mixture.  They are important for cold starts, since no O2 is
available.

The ECU basic start adjustment is based on the above variables to be
set.  From there it adds timining or modifiy fuel pulse, and idle air,
to keep rpm.  If the base values are off, then the ECU adjustments
either over or under correct.  Then the computer gives up on a normal
idle and then goes for a high idle just to keep the engine running.

read through the archives, pmail me, I'm on digest mode, and I can get
you more detailed diagnostic focus.

Mark