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Date:         Mon, 18 Jul 2005 05:57:21 -0700
Reply-To:     Mike Frost <mafrost@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mike Frost <mafrost@GMAIL.COM>
Subject:      '87 Westy Weekender owner needs help!!!!!! 2.1L wbx running
              rich???
In-Reply-To:  <42db2056.209a246f.7fea.ffff9bddSMTPIN_ADDED@mx.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

I had this problem for a long time on my '86 GL. I spent countless hours tracking it down.

In the harness just above the injectors there is a green wire that carries the output of the O2 sensor to the computer. This wire is actually a coaxial cable with an insulated center conductor that is wrapped in a braided copper shield and then insulated again. It is essentially a wire inside a wire, and it is visibly larger than the other wires.

There is a spot where this cable connects to a 'normal' black wire before it reaches the O2 sensor. It is a factory splice with rubber boots over the wire on both sides. If you pull back the boot on the green coax cable, you almost certainly find that the braid has worn thru the inner layer of insulation, thus effectively shorting the O2 output to ground. Strip back the outer insulation and cut the excess braided shield so it no longer touches the inner conductor, and your van will once again know what the O2 sensor is doing.

FYI there is another indentical cable that sends the output of the Hall sensor to the idle stablizer (pulses for each firing of a spark plug). This one is spliced at the firewall above the transmission. I found the same condition on this cable too.


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