what is to rich?

[1500chevy5.7l]

so after a lot of tuning my truck runs great plugs have a light brown to them but wile ideling and light cruise...my blm is 118-114 in thaat range but once i hit the gas i hit 127-128 tehn once i level out my blms go to 125 then lwer to 120 and lower....i mean is it to rich? its odd it use to never move more than 125 -130 now i hit 114 sometimes....., any help please let me know thanks....

[1BadZ71Tahoe]

so after a lot of tuning my truck runs great plugs have a light brown to them but wile ideling and light cruise...my blm is 118-114 in thaat range but once i hit the gas i hit 127-128 tehn once i level out my blms go to 125 then lwer to 120 and lower....i mean is it to rich? its odd it use to never move more than 125 -130 now i hit 114 sometimes....., any help please let me know thanks....
Anything over 128 is lean, anything under 128 is rich. 128= isn't adding or subtracting fuel.

Edit: Get it + or - 3 or 4 from 128.

[HaulnA$$]

so after a lot of tuning my truck runs great plugs have a light brown to them but wile ideling and light cruise...my blm is 118-114 in thaat range but once i hit the gas i hit 127-128 tehn once i level out my blms go to 125 then lwer to 120 and lower....i mean is it to rich? its odd it use to never move more than 125 -130 now i hit 114 sometimes....., any help please let me know thanks....As long as your BLM's are trimming the fuel in closed loop and they have not reached the upper or lower limits, you are not too rich, or too lean. What the BLM's tell you is the calibration of the VE tables. If your VE tables are correctly calibrated, the BLM's will be 128 +/- 4 or 5. On a TBI truck, however, these BLM values can vary more than this due to many factors. A few that come to mind are : summer blend fuels, switching from 100% gasoline to E10 (10% Ethanol gasoline), drastic changes in barometric pressure (the ECM/PCM can detect, calculate and therefore compensate for the pressure change via the MAP sensor but it must use BLM's to compensate for the resulting change in fuel pressure due to the atmospheric pressure change) , drastic changes in ambient air temperature (TBI trucks don't come with a MAT/IAT sensor), drastic changes in humidity, just to name a few. I will say though that properly calibrated VE tables do affect drivability and milage. I would'nt worry about BLM swings of +/- 5 either way. If you do, you'll never stop tuning. HTH

[1500chevy5.7l]

well right now i am from 125-128 in gear and from 127-134 out of gear....but when it gets really hot out side i hit as low as 121

[1BadZ71Tahoe]

As long as your BLM's are trimming the fuel in closed loop and they have not reached the upper or lower limits, you are not too rich, or too lean. What the BLM's tell you is the calibration of the VE tables. If your VE tables are correctly calibrated, the BLM's will be 128 +/- 4 or 5. On a TBI truck, however, these BLM values can vary more than this due to many factors. A few that come to mind are : summer blend fuels, switching from 100% gasoline to E10 (10% Ethanol gasoline), drastic changes in barometric pressure (the ECM/PCM can detect, calculate and therefore compensate for the pressure change via the MAP sensor but it must use BLM's to compensate for the resulting change in fuel pressure due to the atmospheric pressure change) , drastic changes in ambient air temperature (TBI trucks don't come with a MAT/IAT sensor), drastic changes in humidity, just to name a few. I will say though that properly calibrated VE tables do affect drivability and milage. I would'nt worry about BLM swings of +/- 5 either way. If you do, you'll never stop tuning. HTH

Took me a couple reads, but I see where your getting at, and it now makes more sense.

Your only true rich/lean scale would be a Wideband O2 Sensor "commanding" a 14.7:1 AFR Correct?

Off track a little bit: What is the big hype of having a programmable 02 sensor? With the 16197427 $0D w/ MAF fast and adam have modified the code to allow the WB02 input, so what's all this standalone stuff's purpose when I can have the A/F ratio right at the tip of my tongue with ScannerPro?

EDIT: ^ The answer is in the fact that you need an lm1 or lc1 to generate the signal. Thanks to craig for that answer.

Thanks,

- B