

| Subject: | Re: Running Rich - O2 sensor reading low? |
| From: | Mike Pedersen |
| Date: | Wed, 19 Feb 2003 19:29:05 -0800 |
Thanks George, Not only did I add to my Vanagon knowledge, I added to my vocabulary as well. Word of the day be damned... Mike ----- Original Message ----- From: "George Goff" <THX0001@AOL.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Wednesday, February 19, 2003 4:34 PM Subject: Re: Running Rich - O2 sensor reading low? > In a message dated 2/18/03 11:37:15 AM, vannman99@YAHOO.COM writes: > > << I guess my question is what could cause a new O2 > sensor to read so low? >> > > Jeff, my man, check for a hinky injector. I only suggest this because I was > occasionally enduring the same symptoms which you described, except that it > sometimes took a couple of reboots to get the van running properly. > Yesterday, on a slight but long grade, the throttle got flabby again but, the > van would not submit to the magical powers of The Restart. The good news was > that it was acting the same dead cold or fully hot so that ruled out a lot of > the fuel injection control system. > > Before I worked on it today, I drove it around a bit with what seemed like a > slight misfire and the attendant lack of zip. After going through the > ignition system and only finding that it was running rich, I turned my > attention to the fuel injection. For the hell of it, I pulled the plugs from > the injectors one at a time to see if one of them was blatantly bad. > Hallelujah! The third one I pulled made no change. When I metered it, it > showed an open coil. > > In answer to your question, the O2 sensor might be DOA, or, a cylinder with a > queefed out injector would just be pumping air which would lean the exhaust. > Then why was my van running rich with a bad injector, you ask? Because the > OXS was detecting a lean mixture and the ECU was trying to arrive at the > proper mix by bathing the 3 good cylinders with excessive fuel. > > You know, I am amazed how well these things run on 3 holes. > > George >
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