I would start checking the wires at the ECU connection with a multimeter.
It may only be one wire that is bad.  The Bentley gives pin by pin specs
for most of the critical components of the FI system.

                                                   Jay

Blake Thornton <thornton@MATH.UTAH.EDU>@gerry.vanagon.com> on 11/30/2001
11:55:37 AM

Please respond to Blake Thornton <thornton@MATH.UTAH.EDU>

Sent by:  Vanagon Mailing List <vanagon@gerry.vanagon.com>

To:   vanagon@GERRY.VANAGON.COM
cc:
Subject:  splicing wires (was: van still dying)

OK, if you read my post yesterday, my van is dying and I can't find the
culprit.  I have decided that it could be some bad wires in my wiring
harness (I'll explain why I think this below).

So, I plan to cut open the suspect location and begin splicing new wires
where I think there are now bad wires.  So, I could really use some help
knowing how to do this.

- Do I need to use any special kind of wire?  (what gauge, solid or
strands, any special kind of casing on the wire needed, etc)?

- Are wire nuts enough or do I need to solder it?  If I need to solder it,
can someone describe to me how to do this?

- do I need to tape it back up with any special kind of tape (eg heat
resistant?)

Now for my reasoning:

About a year and a half ago, I found my wiring harness slipped and touched
my muffler (the engine shield wasn't attached properly).  It seemed to
burn the wire and my van died for a day.  The next day the van started up
and it has ran ever since.

I forgot about this until yesterday when a couple people said my van dying
really sounds like a bad ground.  Well, I knew I cleaned all my grounds
and then it occured to me that I had this wiring problem.  I figure that
perhaps the heat weakened the wires and now they are only marginal.

So, I plan to cut open the harness and replace all the wires in the
infected area.

Thanks for any and all ideas,
Blake
84 westy
SLC UT