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Tuner
Need help, going really lean in CL
Took car to the auto X today and after a few runs the car goes super lean in CL, when I switch it to open loop via hp tuners it goes to stoich, also in CL when going WOT the AFR goes to where I have it set at, does this mean I have bad O2's or a burned O2 sensor wire??? The voltage for the O2's is not bouncing up and down but does move a little with AFR changes. Also if I keep hitting "reset fuel trims" it stays normal until I let off, then goes lean. Log- The 1st min is in OL, then at 1 min I switch back to CL and you can see it slowly go lean and STFT take over.
Last edited by Ls1c5vette; 03-19-2011 at 02:45 PM.
2015 Yukon SLT 5.3
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Tuner
^Just did. The 1st min is in OL, then at 1 min I switch back to CL and you can see it slowly go lean and STFT take over.
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your 02 sensors aren't switching. they should bounce. you have tuned your car so well there is no variation in airflow or fuel delivery. good job!
lol, they are prolly bad, replace them!
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Tuner
Both can take a shit like that? Car was running fine this morning then bam, this. Funny thing is if I connect to scanner with car off they start at 447 then SLOWLY (over 3 mins) dip down to 250. I know its not a ground issue cause when I disconnect them it stays at 447.
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Well, you might check into other options that are related to both or wait for a second opinion.... It is weird.
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Tuner
Driving around in OL, both O2's in the scanner are going up and down SUPER slow, like ~50mv every 5 seconds.
Unpluging the O2's from the car the scanner shown 450 like it should.
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Tuner
Bump, someone has to know something???
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I would replace them.....It's hard to know for sure over the internet but that's what it points to.
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Tuner
^I am going to replace them but would like to know why it fried both O2 sensors at the same time?
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Tuner
Could a long rich condition, ie, 12.5 AFR for sustaind high rpms like at a auto X burn them up?
BTW it was def the O2's bad.
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I've never heard of that happening.
How old are they?
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