Date: Mon, 29 Sep 2003 07:15:12 -0400
Reply-To: vw4x4@FYI.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Eric Zeno <vw4x4@FYI.NET>
Subject: Re: 2.1 fuel injection problem
Content-Type: text/plain; charset=us-ascii; format=flowed
After all this does unplugging the O2 still fix the problem?
Eric
Frank Condelli wrote:
> OK, gurus I have a problem here that I have been unable to resolve
>and am asking your collective help.
> 1991 2.1 engined Vanagon. Running way too rich, black smoke pouring
>out of exhaust tail pipe at idle and under acceleration. At cold startup it
>seems to be running perfectly, no black smoke, when the engine warms up, you can
>hear it change rhythm, the black smoke starts pouring out the exhaust. Let
>it sit until the engine goes back to cold and restart it will run perfectly
>until it warms up, drop in idle then black smoke again.
> Unplugging the O2 sensor cures the problem, so I immediately though it
>was a bad O2 sensor. I have done the following and NONE has resolved the
>issue. New CAT, new OXY sensor (tried two), exhaust system is not leaking
>anywhere. Checked & replaced Temp II sensor (original was giving same readings as
>the new one but replaced anyways). Checked throttle position switch, mechanical
>clicking and continuity test, OK. Checked AFM, all readings as per Bentley,
>swapped in an AFM from a perfectly running 2.1, made no difference. Checked
>air intake track, clear and free of obstructions. Tried swapping computers,
>two different ones actually, all the same. Checked all wiring from computer
>terminal plug to respective sensors, did all tests as per Bentley, all OK.
>Checked all grounds, all OK. Idle stabiliser valve humming, unplugging it will kill
>the engine, unplugging it by the yellow connector on the firewall drops the
>rpm. Swapped in an Idle Stabiliser Control Unit from a known working 2.1, made
>no difference.
> So..........WHAT am I missing ????
>
>Cheers
>
>Frank Condelli
>Almonte, Ontario, Canada
><A HREF="http://members.aol.com/BusFusion/bfhome.htm">BusFusion</A> a VW Camper camping event, Almonte, ON, June 10 ~ 13, 2004
>'87 Westy & Lionel Trains
>Member: <A HREF="http://www.vanagon.com/">Vanagon List</A>, <A HREF="http://www.bcn.net/~limbo/">LiMBO</A>, <A HREF="http://www.westfalia.qc.ca/">IWCCC</A> & <A HREF="http://www.ccvwc.ca/">CCVWC</A>
>Vanagon/Vanagon Westfalia Service in the Ottawa Valley
><A HREF="http://members.aol.com/Fkc43/stebro.htm">STEBRO/Vanagon Stainless Steel Mufflers</A>
><A HREF="http://members.aol.com/Fkc43/busindex.html">Frank Condelli & Associates</A> or http://frankcondelli.com
>
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