05YukonXL
Member
I can switch the scanner to 'metric' readings on the next run... assuming that goes to grams/sec reading.
.01 lbs/sec = 4.53592 g/sec
.02 lbs/sec = 9.07185 g/sec
.01 lbs/sec = 4.53592 g/sec
.02 lbs/sec = 9.07185 g/sec
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Thanks for the feedback. Interesting ... Got this truck second hand and to my knowledge no oxygen sensors have been changed during my ownership. Indeed the 174 and 171 codes are LEAN both banks. I have not tried tightening bolts ... but I can. (Only sensor I can think of that was changed was ABS speed sensor to help clean up some ABS/Stabilitrac dash warnings.)Those long term fuel trims are way off. Yeah, something might be up with his MAP and MAF readings, hard for me to tell, don't know enough.
So what causes high trims? Too little fuel. What causes that? Bad or Lazy O2 sensors or the wrong ones, bad MAF sensor, intake gasket leaks (usually the other way around, too lean) but stranger things have happened.
So, how old are your oxygen sensors? If they have been changed, when and what brand was used? Any other sensors changed? Did you try tightening the 10 intake bolts?
The consensus is to change the O2 sensors at 100K miles. Now if you do, use only GM OE:Thanks for the feedback. Interesting ... Got this truck second hand and to my knowledge no oxygen sensors have been changed during my ownership. Indeed the 174 and 171 codes are LEAN both banks. I have not tried tightening bolts ... but I can. (Only sensor I can think of that was changed was ABS speed sensor to help clean up some ABS/Stabilitrac dash warnings.)
Today's update:The consensus is to change the O2 sensors at 100K miles. Now if you do, use only GM OE:
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Both numbers are on the same box. Sometimes one number is advertised at a lower cost than the other across the internet.