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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

bad o2???

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Old Feb 26, 2013 | 10:00 PM
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teal94z281989's Avatar
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From: honey brook,pa
Default bad o2???
ok so i was using tuner pro rt and at idle the left o2 is reading from 50-700 and the right o2 is reading 950-972. so my question is, is my right o2 bad?
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Old Feb 26, 2013 | 10:02 PM
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Easiest test would be to swap right to left & left to right to see if the output follows.
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Old Feb 26, 2013 | 10:09 PM
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A properly functioning O2 in closed loop should fluctuate wildly from high to low (.100-.900).

Only in open loop will they read steady as they are still warming up.
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Old Feb 26, 2013 | 10:15 PM
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From: honey brook,pa
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car was warmed up with these results, so my right is bad? im getting like 13mpg could this be the reason?
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Old Feb 27, 2013 | 07:31 AM
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Originally Posted by OnyxY2KSS
Easiest test would be to swap right to left & left to right to see if the output follows.
Only sensible way to test it.
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Old Feb 27, 2013 | 08:21 AM
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Ok so I'm gonna switch them and see what happens if the readings follow the 02 then its bad correct?? Also on tuner pro Rt what does cylinder ID mean? Thanks for the help guys I'm new to this and if I can't find the question on google I come here haha. U guys are Awsome and help out alot. Again thanks
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Old Feb 28, 2013 | 12:42 PM
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From: honey brook,pa
Default here is a screen shot of my readings from tunerpro rt
can someone let me kno if eveything looks ok, also the right o2 didnt move much from that number this was closed loop.
Attached Thumbnails bad o2???-screenshot_2013-02-27-14-07-32.jpg  
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Old Mar 3, 2013 | 01:31 AM
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Originally Posted by RamAir95TA
A properly functioning O2 in closed loop should fluctuate wildly from high to low (.100-.900).

Only in open loop will they read steady as they are still warming up.
As stated above you have a bad O2 sensor. Low voltage represents a lean condition while high voltage represents a rich condition. If you are at 950 and not fluctuating then you are dumping a lot of fuel and getting horrible gas mileage not to mention your catalytic convertor is going to become destroyed soon. I recommend you replace both O2 sensors. Reason being you want both sensors reacting/fluctuating at the same rate for the optimal air fuel ratio which affects gas mileage and performance.
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Old Mar 3, 2013 | 06:10 AM
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Did you swap side to side yet?
a stuck injector could dump fuel and have an O2 reading like that correctly..
Swapping the sensors from side to side gives you a simple free way to check.
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