Date: Thu, 16 Jul 1998 09:00:24 -0700
Reply-To: Nathaniel Merrill <nmerrill@PARAMETRIX.COM>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: Nathaniel Merrill <nmerrill@PARAMETRIX.COM>
Subject: Update-More 91 syncro troubleshoot ?'s
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This is an update on my O2 sensor problems.
Background: Van ran great, I purchased new "splice in" Bosch O2 sensor just for good measure. Made quality splices of the three wires. Now the van runs lousy...real rich/no power. Unplug the O2 sensor and it runs great. see below for more tests I ran.
The final solution:? The Van was going in for a coolant flush/fill/pressure test, as well as AC check (it no cold), so I said look into the O2 thing.
They determined that the Coolant temp sensor (for the ECU) was bad. They replaced it and the van runs great again! No problem with the O2 sensor.
Does this seem to make sense?
>I ran some more tests. As far as I can tell the sensor is the correct one. It also looks identical to the old one. The splice I made was 6 inches from the sensor and are OK. SO I did not mess with the green possibly coaxial cable up on the other side of the connector and the three wires to the sensor are not coaxial. None of the pins on the two connecters show continuity with ground or the sensor housing. Only the two white wires are continuous with each other and the black is not continuous with anything. Is this correct? As I understand it the two white wires are for the sensor heater. I would expect them to be continuous if this was true (but, my old sensor does not show continuity though the two white wires-maybe the heating element was burnt?) I also tried what was suggested- run the van with the O2 unplugged and check for voltage. With the engine at normal op temp there was no voltage between the black wire and ground (using a multi meter). Is this the way to test this? Any more help is appreciated!.>
>>> Gerald Skerbitz <gsker@x139-110.med.umn.edu> 07/12 7:26 AM >>>
The green wire which runs to the O2 sensor is a coax wire. The outer wire is
a shield of some sort which goes to ground. Make SURE you haven't connected it
to the O2 signal wires.
On Sat, 11 Jul 1998, Nathaniel Merrill wrote:
> There recently was a thread regarding poor running of a Vanagon after a tune up. I read the conclusions and don't think it covers my problem although It is related...
> I just installed a new O2 sensor. It was a Bosch which needed to be spliced in. I know how to solder and made some fine connections which were covered with shrink wrap afterwards. Anyway, it's now running really crappy...Smoke, black tail pipe, sounds like it's missing....the works. It did run fine before the switch AND I unplugged the O2 sensor and went for a test and it ....dare I say, ran great. Whats Up?
>
--
Gerry
Gerald Skerbitz <g-sker@umn.edu>
U of MN Academic Health Center Administrative Information Systems 6-5379
Home St. Paul,Ramsey County,Minnesota, USA
