Ive been reading up on getting my car to be richer as its too lean and cant get it down. --its any where from 14.7 to 19.5 afr.---I WANT TO raise my 02 swing points to push it richer, and need thier address in tuner pro [7747 ecm] ---Are they possably, rich thress,vs air, [0499] AND lean thress,vs air[049e]

 

Any ideas guys on the 02 voltage switch points,address in tuner pro with 7747 ecm,-- as i need to check settings.---------Ive read that in alot of bins that thier low and can cause lean condition even if the blm is in line.----they need to be at a certaqin voltage.

 

Is it that lean with good closed loop going on (i.e. integrator works, and BLMs stabilized)??
If the values for rich and lean threshold (or thress? spelling??) vs air apear to be around 600mV and 300mV respectively, then yes, those are the switch points. If they don't look like those numbers you may have an error in your config, because those probably are the right values. But, if it's at a steady state and getting 19.5:1 at anything other than very low MAP or choppy idle, then you have another problem, I'd guess.
Where are you seeing the lean? Low low MAP doesn't exactly produce good combustion, so don't worry too much about what it is.

 

Are you getting those readings from a wideband O2?

could it be a simple as a bad O2 sensor? Worth a thought

 

blm were in line and wide ban showed the lean cond,.---ill try to post were i have the 02 specs at now.--what bin can i look at to maybe start off with on 02 spec--------If you look at the stock bin asdu, and asdz you will see why im proubly lean, as i was using.-------hey red, on thos mv specs are they at the low air flow ? [the 600mv and 300 mv]------ that lean cond, i see is at idle or cruise. [14.7 to 19.5] and is up and down very fast reading wide ban

 

Your O2 may be slow responding, and the fuel closed loop may be overshooting a lot, or you may have a misfire which is blowing air at your wideband, or your wideband may be flickering all by itself.
If it's a steady rhythm of 14.3-19-14.2-19-14.3-19, then I suspect your O2 sensor.
If it's like good good good 19 good good good good 19, then maybe the wide band.
If it's flickering to 19 very quickly and in beat with the engine speed, could be misfire.

 

OK, I added a new delco 02 sensor today, and see it had no affect on my drivability problems. ---Ive raised my 02 r/L tables and mean, and lowered my stoich to 14.0. to get more fuel to this veh.--- Now my [ NEW] wide ban shows anywhere from 14.0 to 15.5. afr. at idle, and thier all over.-14.0 14.9 15.2 14.4 15.0 14.0 15.0 14.4 15.3 and they keep going like that. and idle is flux a little.----and this is after i roughed out blm after setting my 02 settings higher.-----Could it be air leak ?? miss ??, like RED said.???-----Is it possable my copper header gaskets are leaking, even tho i cant see or hear any leaks ??-------------AND then thier is the very lean spike to 21.0 afr, on off gas decell, ---Lets say at 60 mph, and you do complete decell off gas it spikes to 21.0 on afr, then as you get near say 35 mph, it starts to come down off 21.0 afr slowly, with alot of up/down,, afr readings,, and as you reach near idle its back to as i stated above.------Any suggestion guys. ???

 

Closed loop is supposed to go up and down a lot (that's its intent), and at closed throttle decel it's supposed to be lean (because it shuts off fuel completely).

Sounds normal to me, although you can slow down the proportional and integrator gain at idle to make the A/F swings smaller.

Changing the stoich A/F to 14.0 did nothing except change your BLMs. It will still closed loop to an actual 14.7 due to the O2 sensor and gasoline.

 

Quote: Changing the stoich A/F to 14.0 did nothing except change your BLMs. It will still closed loop to an actual 14.7 due to the O2 sensor and gasoline.

what if the gasoline is 10% ethanol(E10) would not the A/F then be 14.13? or lambda 1.00 on WB? With the changes he and I did? My stoich is commanded to 14.0 and I raised the settings as did Carl due to E10.

 

We're both right, in a sense. Changing the stoich constant will pretty much only affect your BLMs, and if you're using E10, the stoich should be set to 14.xx whatever, and the VE should then be correctly calibrated. The wideband and narrowband don't know what fuel you're using and will show Lambda = 1 when the narrowband switches. The wideband can be programmed to report lambda=1 as 14.7, 9, 10000 whatever, as you probably know (although not all widebands can be programmed by the user).