Yup, passed, which is a thing to celebrate in any old VW, esp. in California. Thanks for the info. > ---------- > From: Tom Young[SMTP:young@sherlock.SIMS.Berkeley.EDU] > Sent: Wednesday, August 13, 1997 4:05 PM > To: Erik Rhodes > Cc: Multiple recipients of list > Subject: Re: Oxygen Sensor > > On Wed, 13 Aug 1997, Erik Rhodes wrote: > > > > > I just had a smog check done on my '78 bus and the smog check > > guy said the oxygen sensor was bad, thus misinforming the computer > and > > making the CO output too high. Is this right? Putting in a new one > > hasn't affected engine running or anything, just what does this > sensor > > do? > > The O2 sensor is a little battery. The "potential" difference that > drives it is the difference between the O2 in the exhaust and the > ambient > O2. A "rich" mixture drives the voltage toward the maximum of its > output > (around .9 - .95 volts) while a "lean" mixture drops the voltage down > toward zero. The computer reads the voltage output and adjusts fuel > delivery accordingly. > > Did you pass smog with a new O2 sensor? If so, you were probably > running > rich (and the faulty O2 sensor couldn't tell the computer about it) > which, if not too extreme, tends to imporve driveability. So you > might > not notice significant differences in the seat of your pants, but the > exhaust analyzer gives you a "pass" instead of a "fail." > > --------------------------------------------------------------------- > Tom Young young@sherlock.SIMS.Berkeley.EDU > Lafayette, CA 94549 '81 Vanagon > --------------------------------------------------------------------- >
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