Acceleration Hesitation from a Complete Stop

I was reading that you shouldn't go over 4000 RPM until you hit 600 miles or so. I'm guessing 0-60 runs would go over that? I did see a comment about disconnecting neg terminal for a bit. I think this also may have been triggered / worsened by trying out eco mode. After trying eco mode it was very boggy.

 

There's tons of arguments over what to do or not do during break in. At only 40 miles it hard to tell if something is wrong or not, but the transmission has some learning to do but once you get past like 500 miles it would probably be ok to let er rip a few times get it though all the gears.

 

Recently purchased a ‘24 TRD non hybrid. Noticing some hesitation from a dead stop. Engine feels like it is not engaging right away when I press the gas pedal. Luckily not a dead pedal like others have reported but I will have to pay a lot closer attention to this now that I see other people having issues. Almost feels like when I had a transmission go out on me and the power just isn’t there and all of sudden the gear kicks in. Saw someone suggest it being a non hybrid issue. Test drove 2 ‘24 Sequoia Hybrids and could be Toyota had issues programming without the hybrid motor. I did not notice any hesitation in the hybrid and they did seem more responsive on the pedal but I am starting a family and did not want the baby riding on top of batteries and potential cost to replace the batteries when they go out. BenjamMan has the new ‘24 TRD Pro and has issues showing up already. Hopefully this is just minor and will go away but seeing these posts I feel it will be everlasting. Still under 2k miles mostly highway and some desert city miles and small trailer towing.

 

What happened to reporting what mode its in? In ECO mode there is large throttle lag. In NORMAL mode, little shorter delay. In SPORT mode, a little better.
This isnt as responsive as a standard NA engine. Sort of attributed this to fuel enconomy and turbo lag.

 

I tend to drive in sport mode or normal mode, barely ever use eco mode. I am noticing hesitation on stop lights, parking lots, etc. mostly noticing a harder acceleration in the sport mode compared to normal mode but similar hesitation on both modes.

 

I have a 22 Hybrid and when I say go...it goes

 

Curious as to your build date?

 

**knock on wood** I had a transmission / torque converter issue which was replaced at no obvious charge from toyota after having my truck in there for many days for diagnosing. They've since replaced it and I have not had this issue and no more ticking sound. But you exactly described one of the symptoms I had. Maybe similar or not who knows... I was so determined it was the transmission that I pushed hard against it then "Engineering agreed" and sent my dealer a replacement.

Edit:: emphasize on the torque converter.

 

Its kind of hard with the posts to figure out if everyone is experiencing the same thing or different things because nothing is really defined.

For sake of the discussion it may be best to limit to issues experienced under 10MPH.

For the vast majority I think the concerning thing is an event where the pedal was pressed and the truck kind of sits there before going. It can be a very scary thing.
Another thing is it being described as 1-2 full seconds but the most I have logged is about 0.7 seconds, but it sure felt to me like 2 seconds.

Another issue seems to be a similar condition but the delay is much shorter and may more feel like "jerky starts" or Inconsistent feeling of how far to press the pedal when starting out from a rolling stop.

I've done a lot of logging and Found these things can happen in all drive modes except TOW+.

I've not been able to replicate the "from a dead stop" however in my data, sometimes what feels like you stopped, you didn't quite stop and there is still some momentum. Its possible the Dead stop was limited to the early 2022's that need the TSB TCU Cal Update.

So far what I see it seems to be tied to the downshift to 1st gear that happens at very load speeds when coming to a stop but not fully stopping, and the specific speed and timing of re-applying the accelerator after that downshift.

Its hard to see the exact triggers without a high speed logging scan tool, but one thing i noticed as you slow down the rpm's drop rapidly below 1k as that 1st gear shift happens and then there is a slight 50-100 rpm flare increase. If you apply pedal after that flare the shift is complete and there seems to be no delay.

 

Something not really known but possible its part of the TCU initiation/learning/AI Shift process, but the best I've gotten from Toyota is that it can take up to 3000 miles for that to complete. I'm at 1700 miles, (500 has elapsed from when the dealer reset my TCU memory)

 

Happy to open a tas care with Toyota, but don't we have to show this issue and be able to reproduce it to the dealership? Being able to reproduce it consistently is the issue...

 

I'm not sure if this helps but if you do get a "drive along with tech" see if they can have their scan tool hooked up. Mainly I would ask them to look at Shift Status, NT Speed Sensor and Output Shaft speed. These can all be found under the "AT" Preset in engine live.

The drive pattern is I would get up to 2nd gear then slow down slowly and then hit the gas as soon as you see shift status get back to 1st gear. Mainly seeing NT speed Sensor at 150 rpm, and output shaft speed at 50 while shift status goes to 1st. Those specifics seem to make it hesitate pretty consistently, but so far I see it most by applying the accelerator between .5 and 1 second after the downshift happens.

Since ryanwgregg seems to be able to do it consistently that's the main reason I feel like it won't go away after 3k miles of TCM learning, he puts a lot of miles on.

 

The only other thing is I don't have data from any drives beyond 10 minutes, so if you are driving a ways to get to the dealer you may have to let it sit and cool back down before replicating. I'm not so sure its replicable after the transmission is at full operating temp.

 

I have 2022 non hybrid. Never experienced a single hesitation. Not sure if my driving style or just dumb luck. I do drive in Sport mode all the time since MPG is the same and the lane assist is less ham fisted in sport. I don't many uturns since that shortens your life expectancy in these parts by 50 percent. Are people experiencing them from full stops? A lot of various OEM computer logic has had issues with drivers doing rolling stop decels followed by a full pedal jab. Coders just assume people don't drive like that I guess

 

Can you change modes on the fly or do you have to stop first?

 

If you can reproduce it at will why dont you open a TAS case? Just curious

 

My 2023 SR5 non hybrid had been doing this... not as dramatic as some of you report but an intermittent slight delay taking off from stops. Not every time, but often enough that I always tried to anticipate and be ready for it. Then I had knee replacement surgery a few weeks ago and couldn't drive for about 10 days and since I have been back driving this behavior is gone, at least for now. Maybe it just needed a good rest? ;-) Maybe it will relearn this bad behavior? Who knows?

 

I noticed this with my 23' limited non-hybrid. I drive in sport mode in the city due to the lack of response in eco or regular mode.

 

I haven't done a lot of sport mode testing but I can see how sport interacts with the downshift logic since that seems to be a factor.

I don't really like sport mode as the initial tip in is a little more aggressive, I like ECO for being able to start off smoother but its midrange response is kinda mushy as expected. Normal is what I like the most, and also I don't like the race look of the gauges in sport mode. (#digtaldashproblems)

I really think though that Toyota could refine this some more so hopefully keep bugging the service dept about it so it gets on their radar.

 

Thank you for collecting all of this data. Drives me nuts that the issue has not been fixed nor addressed by toyota. I'm at 3.8k miles on my May 2023 build and the hesitation has not improved whatsoever.

 

I have a 2023 June build 1794 and have the same issue. Almost got killed in NJ yesterday crossing an intersection. Hit the gas and nothing! Had to feather it to get a response as the 18 wheelers got closer and closer!!! Only happens when you need it most. I'll try sport mode and see if it gets better.

 

If I am in heavy, stressful traffic, I always put it in Sport mode. Or try Tow/Haul. I assume you don’t have a hybrid?

I have found that if I do a rolling stop and have it in Normal or Eco, there is a reasonable chance I will get some hesitation. Full stop and I have very good response. I did once experience what you described above and it is a bit scary.

 

I have a 2024 1794 with 203 miles on the clock. While pulling into traffic yesterday with a left hand turn, in a small gap, I pushed the pedal and nothing. Talking about making you nervous as traffic is coming in hot. I am coming from a 2008 5.7 and never had any issues. Went by the dealer and they said that was just normal. Imagine that.

 

Hey guys,

been lurking on this thread site reading multiple issues and I’ve finally cracked. I have a 2022 non-hybrid limited and this issue is driving me nuts! Let alone it’s almost killed me and my family where I had dead peddle in a BUSY intersection. I’ve reported this issue multiple times and have brought it to the dealership multiple times with each time the shop saying they can replicate the issue. The odd thing is, I was in for a normal oil change and the mechanic noted the hesitancy in the parking lot however told me there is nothing that they can do as Toyota has no known fix.
I’ve called Toyota Canada and they have been anything but helpful and have said they have never heard of this issue and that it’s up to my dealership to report the issue. Yet, the dealership now won’t report the hesitancy and can’t reproduce it.
This has totally ruined the experience on my tundra! I loved my 2018 but this is just too much. Wife is too scared to drive truck it’s that bad.

 

I had the software update and still some lag. So I put in a Pedal Commander.
Fixed. It’s plug in play, doesn’t void Toyota warranty. I leave it in City mode. Takes care of any lag. You can adjust the throttle in other modes to the point of laying a wheel and being thrusted back into your seat. It doesn’t make your truck any faster it just removes any delay or lag you get when pressing the gas pedal.

 

Any updates?

 

On my last service, I gave a list of things that I wanted them to address. One of those things was the TSB for the laggy acceleration. I gave the dealership the TSB copy that I had and apparently they applied the ECU updates for it. I did notice that the truck was a bit snappier on the drive home.

They didn't do the fuel gauge TSB for some reason about not having the software to do it.

 

So is this associated with yesterday’s recall?

 

I hate when dealers say it is normal or can't reproduce it and then comes a recall proving it was a major issue all along.

Thankfully Toyota is stepping up to address it so others don't have to go through this experience or be hit in traffic when the truck won't move.

 

My 2022 Tundra Limited Hybrid ran good for what it is worth. No lag or nothing just run. The 2024 Tundra Platinum Hybrid I have now. Runs good no complaints. But seems like 2022 ran a little harder. 2024 seems like fuel mileage is little better even though it does not have a lot of miles on it.