the 18th letter
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I get about 18 and I drive mostly highway a bit slower usually setting my cruise at 75. You can use a plug in disabler $, get it electronically tuned out $$ or replace the AFM parts $$$.
2015 Tahoe LT 4WD Sluggish Acceleration
- Thread starter rb5064
- Start date
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How is your acceleration when in higher gears at higher speeds?
Do you have a scan tool capable of reading live data?
Since they are common complaints with these vehicles, throttle response and shifting improvements are some of the main benefits with the tune. Give us a call 877-809-4070, we would be happy to help.
If you’re accelerating up to speed you should have 8. Giving any serious input over cruising throttle should switch to 8. Any decent incline while cruising should switch to 8.
Go to the screen where you can see if it’s in V4 or 8 while driving and then get the gear to display also. Stomp on the gas and see what happens. See if you can monitor gear selection also.
Did you oil that K&N filter? Did you remove the throttle body during install?
WAG clogged cats?
This may or may not apply to your vehicle, who knows; but in general if the following condition is present the torque converter should be on your list of suspects:
Condition: No power at low-mid RPMs, poor acceleration through the first half of the available shift pattern (in a 6L, gears 1-3) but overall acceleration improves once you're in the top half of the shift pattern (gears 4-6) and responsiveness to throttle position changes is normal at highway speeds.
Suspected Cause: Torque converter has failed; specifically the stator one way clutch (OWC) has rolled over and is freewheeling in both directions. As a result, there is no torque multiplication at all and vehicle only feels 'normal' once fluid coupling has taken place at higher road speeds once stall RPM is exceeded. This will be exacerbated by the 6L's TCC apply strategy which locks the converter starting in 2nd gear.
Not sure if the OP will return to give updates or answer members' questions but I wanted to post in the event anyone else has his or similar drivability symptoms to give one possible cause to look into, in case this one goes unsolved.
This sounds like what it is doing. It didn’t happen all the time, but it happens frequently enough that it caught my attention. It seems like starting from a stop or slow speed that it may be starting in 2nd vs starting in 1st. Meaning, there is a lack of acceleration, like it’s a manual transmission starting out in too high of a gear. Floor the accelerator and it barely crawls. After it warms up, it reaches highway speed, (I live in the country with all two lane blacktop highways), then the problem goes away.
The filter was pre-oiled. I didn’t add any additional oil to it. I loosened the filter cover and carefully moved it out of the east without disassembling the breather hose, and installed turn filter.
Do your best to count the number of upshifts next time you take it out for a drive on the freeway. Wrong gear starts isn't converter. Its usually valve body and occasionally shift solenoids but sometimes can be something inside the case (not nearly as likely, however).
Better yet, if you have a scan tool that will display transmission live data you can immediately rule in or out a wrong gear start. Any Snap on and most Bosch or Autel scanners will work as will an MDI subscription from AC Delco diagnostics for your vehicle ...
