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Adjust Fuel Trim

3:49
11:41
51.2K views

At 3:49 in

"Breaking In" LSXcalade's New Engine and Ironing Out Some Issues (Twin Turbo Escalade ESV)

What happens here

After replacing the IAC valve, the vehicle still exhibits issues, including stalling. The owner analyzes the tuning software on his laptop and realizes that the fuel settings for idle are too low (single-digit percentages) compared to the ideal range of 15-25% from prior adjustments. This lean condition at idle, along with incorrect vehicle speed readings (showing 3 mph when stationary), affects the trans brake functionality. These settings need to be adjusted to provide sufficient fuel at idle.

Goal: Correct the lean idle condition in the tuning software

Tools and materials

  • Laptop Lenovo — Running the tuning software
  • Tuning Software — Adjusting engine parameters, specifically fuel trims

What they say

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lean I don't know why okay see all these things in here are like decimals they used to be you can't see it baby it's like too far away well they used to be like single digits like you know three four five something like that that's the percentage of fuel that it's putting in in the idle range well before the first day of race week those numbers used to be 20 25 15 25 somewhere around there then they get to the first day race week and this thing just starts running Pig Rich for no reason don't know why so Brent helped me fix it but he had to change all these numbers around and we could not figure out why it was doing that there's no good reason to explain it and now they're like too low yeah I think we gave it too much sauce in the idle screw so this now we can take it back down are you guys entertained by this no it's not like I'm not entertained by this but this is like crap people don't show you is this stuff right here so we'll take it down we'll take it way down like a lot so now it's kind of stabilized it's doing normal but the stepper is pretty high so we need to open the throttle braid a little bit more so this number will go down which means

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