PE enabled, but not activating (0411 8322)

[Fast355]

I'd like to point this above right on post out. The MAF meter is probably almost 20 years old. 90% of the new/rebuilt ones are sometimes worse than the dirty/coated one you take off. There is no reason EVER to have to alter the transfer function of that MAF in the calibration. Are we smarter than GM on this transfer function? That type enclosed MAF with screens is dead nuts and reliable till it gets dirty or typical age ozone and dust coated. The only ones you can buy that seem to be correct are the AC-Delco and Delphi NEW maf's, not the rebuilt junk at NAPA, Oreilly's, Autozone, etc. You said you have a stock engine so unless you made changes to alter the VE(exhaust, cam, porting, etc), your VE table should be pretty right on too. Best thing to do to start is turn off VE and get it to run correctly on just the stock MAF settings.
I am not talking about cartridge MAF's and how they are critical to inlet ducting and any change in that can cause a lot of grief.

LRT has been very kind to help you, chasing failing or just bad equipment doesn't help anyone.

Good luck,
-Carl

If that is true...
Why does GM have different MAF transfer tables for the very same MAF in different applications? The LT1s are different F-car vs Corvette LT1 vs Corvette LT4. The Vortec trucks are different than the Vortec vans. The 350 vans have 2 different MAF tables depending on which airbox they used too. The 4.8/5.3/6.0L trucks are different than a LS6 Corvette too. I think GM calibrates the MAF transfer for the airbox they used with the MAF. For example, ALL 2002 V8 gas powered vans had the same MAF and airbox. The 305, 350 and 8.1 all used the same MAF transfer except around idle.

I know my Express van ran like crap on a 2002 Express van MAF table using the 97 airbox and ducting. When I swapped to the later ducting and airbox it was still off. I had a good clean OEM MAF and a new smaller body Delco MAF that they sell to replace the larger LT1/Vortec MAF. Same results with both. Camshaft seems to really effect fueling up to about 30-50 gms/sec. First thing I do is disable the MAF and tune the VE. Then I disable the VE and tune the MAF. Even on stock setups they are usually pretty far off the mark.