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Maybe you can get your tuner to list the switches and settings he's making. Get an account on the HP Tuner forum and publish the settings. There are some sharp people on the forum and the advice will come quickly.
It could be the tuner is making an incorrect setting. If you want, send me a PM and I'll forward you my settings. Altogether there are ten changes I made. I have them all listed in a tree level format. Here is one change: - Fuel - Flex Fuel - General - Flex Fuel = Enabled
Changing the Stoich value is one change with the entry of seventeen different numbers.
If you have HPTuners you can compare your adjusted tune to a stock tune and see where the differences are. HPTuners has a compare function that shows changes between the two tune files. It's easy enough that a novice can use the function. If there's one change or fifty changes, you'll see the difference.
If you don't have your original tune, there may be one on the HP Tuner website you can snag one from, or I can send you mine.
What year is your vehicle? The newer vehicles need more tricks to unlock the engine control module.
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2024 Chevrolet 3500HD Z71, LTZ, 4x4, 6.6 ltr. L5P long-bed.
2016 Camaro 2SS Six-speed, Hotchkis sway bars, Eibach .750" drop springs, Mamo throttle body, E85, BMR stuff.
2006 Quicksilver 6-speed GTO ERL LS3-430, All-Pro 285cc heads, 262/273 .758/.742 116+3 cam, Sheet-metal Intake, 70lb Siemens injectors, SLP, GMM Ripshifter, QA1 Coil-overs front and rear, nylon suspension bushings, Hotchkis, RPM Trans, SPEC twin clutch, SpinTech, Kooks 1 7/8 -2.0", BMR drive train, Kaaz 3.91, Lingenfelter CAI, Baer brakes, mini-tubs, E85.
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