Date:         Wed, 16 Jan 2002 12:36:27 -0700
Reply-To:     Blake Thornton <thornton@MATH.UTAH.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Blake Thornton <thornton@MATH.UTAH.EDU>
Subject:      Re: Need ideas - diagnosing troubles.
Comments: To: David Beierl <dbeierl@attglobal.net>
In-Reply-To:  <5.1.0.14.2.20020116135514.035cfc68@pop1.attglobal.net>
Content-Type: TEXT/PLAIN; charset=US-ASCII

David,

Good ideas.  I don't know enough to understand what I've done, but here is
what happens:

> AFM?

I've replaced it with another one.  I've opened the older AFM and it looks
fine.

> Ignition module?

Don't think so because it was acting bad (no throttle response) and I
swapped in another and it still had no throttle response.  Maybe both were
bad, but that seems unlikely.

> No throttle response to me sounds like AFM (including a busted wire to

When the van is running fine, I've disconnected the afm wiring and the van
will respond to the throttle.  My guess is that it responds from the O2
sensor, but I don't know.  In any case it does respond.  So, I don't think
this is exactly it, but it could be part of the problem.

> ECU).  Nice thing about the DigiTool is that it measures at the ECU, so it
> catches all the broken wire/intermittent-contact problems.

Exactly what I think I need.

> Get a mechanic's starter switch and leave it hooked up so you can crank
> from the engine room.  When it's not working -- measure what you can,
> wiggle wires and so forth.  Unplug the ECU and plug it back in (ignition
> off...).

I'll give this a try.  Another major problem is that it is very
intermittant.  The van has been driving great for a week now, and then all
of sudden today it acted bad.

Thanks again,
blake