Date:         Mon, 15 Jan 2001 14:37:25 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Running rich - hellllp!
Comments: To: Peter Cassidy <pcassidy@APPLE.COM>
In-Reply-To:  <200101151907.LAA13242@scv3.apple.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 02:07 PM 1/15/2001, Peter Cassidy wrote:
>      So, the van is running rich in a very big way. This only seems to
>happen when I get up to temperature. When hot, the van won't idle
>properly  & tends to cut out at idle. The exhaust is loud and 'farty'
>- another rich sign & I can't get over 3000 revs while under load.
>The engine misfires a bit when cruising - cruising at 40mph, that is!
>
>      Right now, I'm thinking the Temp 2 sensor is gone. Will this cause
>this problem, even if the O2 sensor is disconnected? I'm posting this
>from work - took me about an hour to get the 20 miles in.

Sure will.  The sender itself or any of the connections between it and the
ECU.  You get an open circuit there, the ECU thinks the motor is dead cold
and acts accordingly.  If you want to be scientific about it, unplug the
ECU and put an ohmmeter on the proper pins before you disturb anything at
the sender end.  Check ohms against the chart in Bentley (TI and TII charts
are the same).  When you find it's way high or open circuit, unplug the
sender and bridge the connector with a paper clip or such -- if the ohms go
right to zero prolly the harness is ok.  To be sure, ohm out the sender
itself.   When you find the location of the high resistance you'll have
found the problem.

david
ps -- maybe the ECU uses a 6502 and it's decided to play Space Invaders
instead of working?  I had that problem with my bench techs when they were
working on II+ machines...



David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"