When looking at the activity of the "crossover" I believe that the basic fuel injection is out of adjustment and will cause an overactive crossover. In other words if the fuel injection system is in proper adjustment, you should be able to disconnect the O2 sensor, and read the voltage from the O2 sensor black wire. Open loop voltage is very stable and should be in the .5 volt range. Anything consistenly above .8 or below .3 volts needs to be corrected. When the system is really tuned the O2 sensor will not crossover as rapidly as a system that is too rich, .8 volt or higher, weak vane spring setting, malfunctioning fuel pressure regulator too high system pressure, Or too lean .3 volts malfunction of fuel pressure to low or a poorly adjusted afm wiper. Other variables could be the cause of either problems, but this is where I would begin. Sincerely, Mark Keller 91 Carat |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.