Date: Mon, 29 Sep 2003 06:27:49 -0400
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: 2.1 fuel injection problem
In-Reply-To: <a2.3cafa399.2ca95fdc@aol.com>
Content-type: text/plain; charset=iso-8859-1
Wiring problem with the O2 sensor or more importantly the ground. Do you
have a ground wire connected at the base of the oil breather? If so,
this is the culprit. Relocate it. The plastic tower makes a lousy ground
connection. I usually place this connection under one of the screws for
the fule pressure regulator.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Frank Condelli
Sent: Monday, September 29, 2003 6:14 AM
To: vanagon@GERRY.VANAGON.COM
Subject: 2.1 fuel injection problem
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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