2007 Burb LTZ 5.3l Flex

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Jul 13, 2014 | 3:25 PM

#11

Skygun

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From: Washington

Quote:

Originally Posted by in2pro

25 tank fills should rule out any anomalies in fuel....
It might be time to consider replacing the sensor if the re-set doesn't help...

Which sensor? The 02? To pass emissions two years ago I had to replace two exhaust sensors, and I purchased aftermarket Bosh. Could they already be bad?

Jul 13, 2014 | 3:54 PM

#12

in2pro

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From: Austin, Texas

Here are some readings from mine I took a while back an 07 with 5.3 flex

O2S11($00) 0.745
O2S12($00) 0.745

O2S21($00) 0.170
O2S22($00) 0.740

ALCOHOL($00) 3.1

Jul 13, 2014 | 4:28 PM

#13

Skygun

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From: Washington

Quote:

Originally Posted by in2pro

Here are some readings from mine I took a while back an 07 with 5.3 flex

O2S11($00) 0.745
O2S12($00) 0.745

O2S21($00) 0.170
O2S22($00) 0.740

ALCOHOL($00) 3.1

The alcohol is correct, mine read that right after I flashed ECM.

Jul 13, 2014 | 4:56 PM

#14

in2pro

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From: Austin, Texas

I have seen my alcohol go as high as 20% but then I also use Techron additive from time to time and that would probably do it...

Jul 15, 2014 | 9:19 AM

#15

Skygun

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From: Washington

Perhaps someone with a bit more knowledge than myself could let me know if the upstream 02 sensors are what is causing my ECM to register rich fuel trim?