again, so what? you eyeball it to the point where it's decent, get it running enough that you can collect the data. once you've seen few VE's, you can figure it out...you have no clue how close you can get eyeballing VEs in the lower regions with enough experience. besides, if you got trims going full blast in one direction, you know approximately how much you gotta adjust and which way. the real problem is to know if someone didn't screw with IFR before, as that will send you chasing your own tail for hours, as it will never make sense...

 

I think you're stepping ahead of your self dude....HE HASN'T TUNED THE VE TABLE YET. If you take a stock truck, set fail=0, shut off the tranny codes, pull the plug on the MAf and expect it to run good you're crazy...it won't, it may not even run if the VE is out of whack enough

 

unless there's a lot of mods on it that would affect idle region's VE, it should run fine. I've pulled maf's on running cars, and they get a little hickup and keep on plugging away just fine

 

It will run anywhere from 10:1 up to 19-20:1, so I doubt that the VE is the problem. My first SD 2 bar tune was WAY out of whack due to the units being used in the SD table and not having a custom OS installed, and it ran and had normal power at low load situations up to about 17:1

White1's problem sounds like either:
1> He is adjusting the wrong parameters. "Zero the MAF". Could it be that he is resetting the MAF calibration table to all 0s rather than the fail rate? If that is the case, it will not run and no code will be thrown.
2> He is uploading a tune with the right parameters, unplugging the MAF and then trying to start it. The first few starts the PCM will think the MAF is still in play. After the Cranking VE table has done it's thing, the MAF will become a factor and kill the motor. 4-5 starts like this and the MAF code will trip and it will fire right up. Quite annoying.

 

if the AFR variations are that big i'm putting my money on a massive leak at heads or intake, or a MAP sensor gone heywire.
all this talking could be greatly improved with some tune/logs posted, otherwise this whole exercise got that 'two virgins in a dark room' feel to it--lots of poking about, but not much is getting done

 

Talking about my AFR experience? I can tell you exactly my situation occured, and it wasn't a leak or faulty sensor, it had to do with the theoretical VE % formula in EFI Live which takes into account MAP value for fueling calculation. That doesn't work like planned when you're running a 2bar sensor in a 1 bar stock OS... Switched units from % to g/cyl and re-created my initial VE table and it fixed the issue.

Edit: And I have my log from that day, 11/14/2005 open right now looking at it

 

I am running an 04 SS with a supercharger....if I move the IAT sensor to the outlet side of the SC, what changes would that make? I know the air temps there are higher so would that help or hinder my performance?

 

AF Ratio should be closer to accurate with the IAT reading actual charge temps

 

white1, did you set the maf codes for "no error reported"?

 

P0103 should be set to option 2 no Mil light. If you set it to no error it won't fall into SD.