Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (May 2001, week 2)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Wed, 9 May 2001 02:02:21 -0700
Reply-To:     John Clemens <jbclem@earthlink.net>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Clemens <jbclem@earthlink.net>
Subject:      Re: Running rich
Comments: To: Brewhogger@aol.com
Content-Type: multipart/alternative;

Mke:

Check the voltage at your oxygen sensor. With the wire disconnected, engine running, I think it was supposed to put out .3-.5 volts aprox and when I checked mine it was reading .05 volts. It was sending a message to the brain, begging it to enrichen the mixture. The brain was complying, my air/fuel ratio was 9-10 instead of 14.7, my gas milleage was down to 9 miles per gallon. After replacing the oxygen sensor my gas milleage returned to it's usual miserable 14-15 miles per gallon. It was an easy fix.

John nal Message ----- From: Mike Vanderzanden To: vanagon@GERRY.VANAGON.COM Sent: Tuesday, May 08, 2001 7:58 PM Subject: Running rich

My '84 GL is running very rich. Mileage is 10 mpg at best. Blows thick black smoke when loaded (i.e. under acceleration). Down on power in general. Idle speed is eratic but does not stall (yet?). Been driving her daily under these conditions for months. Things I've done: Checked/adjusted ignition timing. Was retarded. Now correct (at least close). Made no difference. Measured fuel pressure: 36 psi at idle with vacuum connected. 42 psi (at any engine speed) with vacuum line disconnected. If increase engine speed (with vac. connected), fuel pressure decreases (yes, DECREASES) to about 32 psi. Swapped out the air flow meter for another (used but serviceable) one. No significant change in behavior. Examined the spark plugs. All four were equally black and sooty. I also cleaned (with electrical contact cleaner and, in case of ground

connections, emery cloth) and exercised all of the connections I could find on the engine management wiring harness. I plan to measure the Temp. II sensor resistance tomorrow. An observation: I noticed that the position of the AFM wiper is about 20 or 25% "open" with the engine idling. This seemed surprisingly high to me, but I have no reference. Could be normal. Anyone have any input? I also

adjusted the CO adjustment screw (under the plug on the AFM housing) and this had no real effect on the position of the AFM wiper. Had a small effect on the quality of the idle.

I did a mechanical rebuild on this engine two years ago (did not do anything to the fuel injection/engine management system). It ran fine and gave me 19+ mpg overall fuel mileage until this problem cropped up a couple months ago.

Thanks for any suggestions.

Mike

I know that there's probably been several discussions in past on this subject, but I am new to this list and I haven't figured out how to search the archives by subject. Maybe someone can help this non-savy computer user in this respect.


[text/html]


Back to: Top of message | Previous page | Main VANAGON page

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.