____________________________________
 From: Dvdclarksn
To: mdrillock@cox.net
Sent: 6/5/2009 7:22:42 P.M.  Eastern Daylight Time
Subj: Re: rich running condition-still searching for  problem

I'm in Roanoke, VA. I work as a service advisor at the local Honda
dealership and have access to a variety of tools. I have been thinking of
purchasing a digitool if I end up keeping this engine. Tonight I checked the
connection at the AFM and also the boot. All that was ok. I applied some
di-electric grease to this connection, the O2 wire connection to the computer,  and
several ground connections. I also checked for any trace of voltage at the
ground connections in the engine  compartment and found nothing there
either. I'm thinking that I may replace the O2 sensor since it has 52,000 mi.  on
it and VW says replace it every 30k right? I'm starting to run out of
ideas. Could the AFM tracks be dirty? the connection looked perfect. Am I
missing any ground connection points that might need cleaning/replacing?  Thanks
for your help.

David

In a message dated 6/5/2009 6:58:21 P.M. Eastern Daylight Time,
mdrillock@cox.net writes:

It  sounds like DigiTool time. The DigiTool allows you to look at the
readings of the sensors in real time, as the ECU thinks they are
reading. Testing the sensors themselves doesn't tell you what the ECU
sees. Where are you located?

Mark

David Clarkson  wrote:
> I am still trying to track down the rich running condition on  my 90
> Westfalia. I thought that the problem may have been related to  the
ground path
> and have cleaned up the two ground points under the  coil and have moved
> another  ground connection from the coolant  tower previously to a better
contact
> point. I  also replaced a  connection for the green wire that attaches to
the
> positive  side  of the coil. No change. I also put together the test
wiring
> harness discussed in  a previous thread from the article  on the Samba. No
> changes with the problem  with the harness in  place. I also tried
shutting off
> and then restarting the   engine with the engine running to test the o2
> sensor per Dennis'  suggestion.  This did correct the problem for a few
seconds. I
>  then disconnected the o2  sensor and still had the problem so I think
this
> rules out the sensor. I had  previously found the correct  voltage coming
off
> of the sensor (.1-.7 volts). The  temp II  sensor has been replaced and I
> have checked the wires to the sensor.  I  am going to check the throttle
switch
> to see if any problems  are evident here  tomorrow. I also am going to use
> probe pins  to try and check for voltages at the  computer from the temp
I,
>  temp II and AFM. Any other suggestions from the list  to check on  this
> problem? The problem was an intermittent rich running  problem  and now
seems to be
> almost constant. Thanks  gurus.
>
> David Clarkson
> 90 Westy
>

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