When you say you're getting those readings on the "O2 sensor with it hooked up to the ECU" I assume you mean the voltmeter is "inline" between the O2 sensor and the ECU? If so, re-run your test with the O2 sensor disconnected. The O2 sensor should put out a voltage of right around .5 volts at the correct air/fuel mixture (the graph of voltage vs. mixture is *very* steep right around the "ideal" mixture, so you should see a rapid fluctuation above and below .5 volts) with higher voltage indicating "too rich" and lower voltage indicating "too lean." What you're reading is the output of the O2 sensor, the ECU's attempts to correct, and whatever distortion you're introducing with the voltmeter. Doing the test with the O2 sensor disconnected will give you an indication of the basic mixture before the ECU tries to correct it. You adjust the air/fuel mixture after making sure that every other aspect of the engine - mechanical, ignition, vacuum, etc. - is correct. Adjustment of the air/fuel mixture screw is the first thing to try to correct a "too rich" situation --------------------------------------------------------------- Tom Young '81 Vanagon Lafayette, CA 94549 '82 Westfalia --------------------------------------------------------------- ----- Original Message ----- From: "Chad Morris" <chad@ALLMORRIS.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, September 11, 2003 10:20 AM Subject: O2 readings
I am reading between .81 and .89 volts on my O2 sensor with it hooked up to the ECU. I am thinking that indicates I am running rich. Assuming my O2 sensor is good, what would the ideal reading be? If it is indeed running rich, should I be able to remedy that simply by turning the air/fuel mixture screw, or will I need to mess with something else to get it to run right? Any thoughts? |
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Vanagon mail messages have been archived.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.