Earlier post was new 2018 yukon with rough idle that comes and goes, poor accelerator response and surging as it runs up to about 45mph, converter hunting or coming on and off.
Fixed idle by raising it to 675 in neutral/park and in gear. Wife loves it, also helps with backing up as before it wouldn't move when releasing brake.
Added up to 22% to the driver torque demand to improve throttle response. Also turned off converter through 4th. TCC only in 5 and 6. This fixed surging and struggling in lower speeds/gears.
Lowered the TCC slip desired and raised the ramp rate and pressure (didn't change but 6 actual psi on scanner) Tried 0 slip rate and more aggressive ramp numbers but it was not happy and kept jumping in and out. Slightest movement of throttle makes TCC release and re-apply. Would like to figure this part out but it feels real good.
Shortened shift times by 10% and turned up shift pressures a bit along with slight inertia table increase. I did this as I also increased the minimum spark tables to 8 degrees. This made the upshifts feel awesome and better through the gears but kickdown from 6-4 or 5-3 or 4-2 were way too harsh. So maybe the removal of torque management would be better.
Also removed V4.
The wife now loves her new car. We have been to the dealer 3 or 4 times with concerns and even drove another with some of same issues except the rough idle problem. They started a case but I said EFF it and new nothing would get done. I've tuned more than a few things, mainly diesels and TCM's but we wern't looking for more power, just some drive-ability.
Here is my map, If anybody has any Ideas to add I'm open. Would like to tune the VVT so it is used more for performance than EGR, Ideas all ways appreciated.20018YukonTerrisTune5.hpt