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You're probably just fine Posted by Ari [Email] ![]() ![]() In Reply to: O2 sensor voltage question, AdamD, Wed, 5 Mar 2008 10:08:37 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The ideal stochiometric (that's a mouthful!) produces a value of 0.5 volts from the sensor. That's the 'ideal' fuel air mixture. The fuel control (LH in your case) swings the mixture between very slightly rich to very slightly lean, as that is necessary for the 3-way catalyst to work.
The O2 sensor is very sensitive. "Perfect" mixture is 0.5. Very slightly rich is about 0.7. Slightly rich is 0.9. Rich is 0.9. Whoppingly, black smoke rich is 0.9. Ditto for lean. What does that mean? It means that getting the sensor to 0.5 average means that things are working very, very well. If you have a 'slow' sensor, the fuel control would always be behind, and you'd see big swings.
It's my opinion that (1) your O2 sensor is working just fine, and (2) you have a slow meter. Digital meters average over a period of time. If your particular meter averages over a 'long' time - like 0.5 or 1 second - then it would make sense that you'd see the average voltage - 0.5 volts, and you wouldn't see much of a variation on the meter.
Bottom line - seeing 0.5 volts average on the meter shows that lots of things are working just right. 21 year old car. DON'T MESS WITH IT!
posted by 76.205.17...
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