Date: Mon, 21 Sep 2009 10:26:10 -0700
Reply-To: Leonard Anthony <whitewatering@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Leonard Anthony <whitewatering@GMAIL.COM>
Subject: Re: 1.9 ltr WBX O2 sensor question?
In-Reply-To: <aeea9b480909210621g684b8165m4ead20e28f9b0dfe@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi Tony,
The green wire is a coax cable similar to an audio cable. The outer shield
just dead ends before the connector. It is very important the inner wire and
outer sheath wire DO NOT make contact. Bentley service manuel 24.20 shows
how to check for continuity from the O2 to the ECU.
Try checking the ground wires on the left cylinder head. There should be a
ground strap under the coil along with the wires you already checked, follow
it to the head and check all those ground wires and connections as well.
They are all your FI grounds. I read somewhere that it's good to replace the
connectors with soldered-on ones, grouping the wires to 1 or 2 connectors.
It's easy and should be done anyway(from what I researched). I'd point you
to the web page I found this but it was so long ago I can't - somewhere on
westfalia.org probably, if you want to hunt around. Westfalia.org's
moderator claims our 1.9's are not prone to Vanagon syndrome, but I suspect
otherwise. The (2nd) TSB includes us. Mine came with the harness "fix"
already installed by the PO, but it hasn't made a difference in running if
it is installed or not. I would really like to get Dennis' opinion on this
sometime, it's probably in the archives & I'll find it when I have more
time.
I'd then suspect the digital idle stabilizer control. (grean box near coil).
It should be disconnected and plugged together when you set the timing
(28.33). It's only purpose is to advance the timing if it drops below 700
rpm under load, so you don't stall when your creeping along in stop & go
traffic. If you disconnect it and plug the connectors together, and the
symptoms clear up, you will know it's bad.
Hope this helps. If you get any useful PM opinions I'd be interested if you
don't mind forwarding them to me.
Len
On Mon, Sep 21, 2009 at 6:21 AM, T Collins <tonycollin@gmail.com> wrote:
> Hello Folks,
>
> How quickly does the O2 sensor give a signal to the ECU? I notice a split
> on
> the green wire connector to the sensor. I patched it with a new connector.
> I
> noticed that the green wire seem like 2 wires one inside another sheet.
> Does
> that seem familiar?
>
> I am still having problems with what seems to be Vanagon Syndrome. I am
> trying to find out why the van will idle fine and smooth for a minute or
> two
> and then miss idle. The timing mark is steady with the split on the case
> until a minute or two then it jumps around from the case point and then to
> the left (facing the van from the rear) drivers side of the van.
>
> If driven the van still runs like poo, buck and continues to stumble
>
> The idle then becomes ever so erratic. What could make this mark jump like
> so?
>
> Spark:
> New spark plugs (double checked the gap)
> New plug wires
> New rotor
> New cap
> Timed with static light using recomendations on rpm and timing settings.
>
> Air:
> Vacuum lines checked with carb cleaner
> Little vacuum lines replaced
> New air cleaner
> New injector seals
>
>
> Fuel:
> New pre pump fuel filter (the square one)
> New fuel lines
> Pump seems to be humming along
>
> Grounds:
> All grounds to the chassis under coil there checked and cleaned.
>
> I am missing something....I just dont know what it is:
>
> Plan:
> Replace temp II sensor
> Place capasitor on AFM
> Check O2 sensor
> Re-time (x100)
>
> Thanks,
> Tony
> --
> 82 Scirocco "Rodolfo"
> 85 Vanagon "El Guapo"
> 90 Fuji Ace
>
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