Quote Originally Posted by 89Vette View Post
(Sounds like you're expecting too much from "Mr. Turd in the punchbowl". After all...He says he's doing the best he can! LOL)

Though I'm skeptical that the VX is programmed too rich from the factory, I will be interested to see how the OP's modifications work. If it does help, I'll wonder if this mod is compensating for another issue (like O2 or MAF).

I think the bigger issue with going lean is to the converters. They die first. Engines can tolerate leaner than stoich burn ratios as lower loads. At WOT, it's a bad idea.

How is this much different than the IAT trick?
Speaking for OUR ECU, which is probably programmed a little differently, when you hook up a bank of sensors and watch behavior you can see where the poor fuel consumption is coming from.
At 20% TPS ign was +40 and A/F was 14.2, At 25% the ign was +12 and A/F was 12:1.......ANY kind of load saw these numbers, with the A/F dipping into the mid 11's at WOT. The system stays in closed loop a lot of the time and has knock sensing so the setup is odd to say the least.

So a lot of the time they are rich and retarded, and thirsty

We are nerdy enough to have got access to the tables in the ECU, but not nerdy enough as to read them & know what they mean.....