Subject	The CEL will not come on for a slow O2 sensor>>
Posted by	ZUL8TR on March 25, 2009 at 4:35 PM
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In Reply To	Brand new O2 sensor slow response posted by Zarcasm(Hfd, CT) on March 23, 2009 at 11:14 PM
Message	It will come on if the sensor completly fails. Check the O2 sensors for actual voltage readings at the connector with the engine running at 2000. With a digital VOM you can see the high and low readings volt. Ideal volt readings are 0v low and 1 v high. Good values are 0.1v to 0.25 low and 0.75 to 0.9v high. The closer the low and high readings are to about 0.5v average the more worn the O2. So you can have the O2 give 5 CEL blinks minimum per 10 sec and still have poor performing O2s due to poor volt readings. What brand O2s are you using, are they OEM units or Bosch or other? ZUL8TR in Orlando,FL
Follow Ups	Brand new O2 sensor slow response - Zarcasm(Hfd, CT) 23:14:08 03/23/09 Make sure you did not get right and left sides confused. - Fast300 00:32:37 03/24/09 I'm sure I got it right. - Zarcasm(Hfd, CT) 18:23:56 03/24/09 The CEL will not come on for a slow O2 sensor>> - ZUL8TR 16:35:53 03/25/09 Right. But you'll notice it in Mode II check>> - Zarcasm(Hfd, CT) 22:02:27 03/25/09 Hook up a vacuum gage after the throttle bodies >>> - ZUL8TR 09:25:17 03/26/09 Thanks! Does the O2 sensor screw into an additional nut>> - Zarcasm(Hfd, CT) 23:23:40 03/26/09 The extra nut on the O2 needs to be removed so the new one > - ZUL8TR 05:22:11 03/27/09 Intake manifold vacuum maybe steady... maybe not - Zarcasm(Hfd, CT) 19:38:10 03/29/09 That vacuum reading at idle is good. The vibs occured > - ZUL8TR 14:43:24 03/30/09 I'm not sure intake vacuum is ok. Valves?! - Zarcasm(Hfd, CT) 21:06:04 03/30/09 You say that the RHS O2 is normal and all RHS plugs>>> - ZUL8TR 14:47:08 03/30/09 My mistake: meant to say LHS O2 is completely normal - Zarcasm(Hfd, CT) 20:28:19 03/30/09
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