Again so righteous. I'm only breaking the law less than the other guy. You guys are too funny. Carry on.
And the OP never asked how to defeat any emissions. He was basically asking how to run the vehicle in open loop.
That's what I thought. You won't.
You are wanting it to run in open loop. No different than if you had a hard fault on a pre cat O2 on a stock vehicle that prevents closed loop operation. Engine>Fuel>Open & Closed Loop>Closed Loop Enable Coolant Temp vs IAT. Set entire table to 285. Or you could just unplug both pre cat O2s from the harness. Both will accomplish the same thing.
Last edited by 2xLS1; 02-22-2024 at 12:04 PM.
I appreciate that. That?s what I did ultimately. Just wasn?t sure how that affected the use of the spark tables since we are advised to copy the high table to low table during tuning. Basically I was asking what affects use of the low / high tables by the pcm. I think someone answered before that said it won?t default to low tables only when I open loop. Which is my original question.
On a side note. Getting away from the argument on here, I just started playing with things and keeping a close eye on the laptop today. Luckily I had the trailer the whole day which is when I?m worried about spark knock the most obviously. Adding to the MAF a few percents up higher in the frequency range, playing with the low/high spark tables a tad ( more on both) , setting it to open loop full time, and kept the VE table to the tuned stio setting. Overall I?m very surprised how much it woke the truck up. To the point I may not do the 6.0 swap at all. The further I get from factory the more pita everything becomes. Experience has taught me that. I only wanted the 6.0 because I have one so dam cheap ( $140) and I wanted the torque curve towing. I live in the mountains. We only ever go up or down lol never flat it seams. With today?s setting it was a noticeable difference. Too early to say but if mpg stays better ( only one tank today ) and the power stays decent then I may just pull the heads on the 5.3 to freshen it all up. Check to make sure it is indeed valve stem seals and not rings causing the issue of oil. No smoke out the tail pipe. Just burns a quart every oil change. The mileage this Tahoe sees we change oil every 30 to 60 days. That?s also why I want to keep things as simple as possible. Close to factory as long as it performs well. It?s the perfect platform for what we do. By no means do I need a power house motor. Just enough to pull safely in this stupid traffic we have around here and keep up safely. Which it does pretty well all things considered. Was gonna do the 6.0 and trans overhaul/ mods to get the torque for the hills while maintaining reliable service. But may not need to do that anymore. A few more days of logging and then again when it gets hot will be the tale of the end route of how this thing goes.