Significant Hesitation in Acceleration

I'd imagine this is a combination of dumbing down of the throttle response for MPGs and slight turbo lag. Going from idle to needing high power right away is the perfect combo to feel lag.

 

There’s no lag on mine.

 

Pressing the ECT/power button on my SR5 proves to me that there is no turbo lag. The throttle is mapped to prevent abuse of the drivetrain. All vehicles do this, regardless of whether they are turbo or naturally aspirated.

 

i know this is a 2 month old thread i am bumping this is definitely a thing. my truck will do it randomly and it always seems to happen at the most inopportune time.

• i always switch to sport mode as soon as i get in so it's not related to that.
• i always remote start it so it's not a rpm/power limitation on a cold motor (also for me it happens randomly, but always at the exact same spot coming out of my neighborhood when i need to cross 2-4 lanes of potential traffic.)
• it is not a turbo lag thing (i have worked on turbo cars since i was 14...) because if you move the shifter over into the sport shifter setting it no longer has any issues.
• it's not a hybrid thing cause that electric motor makes nearly 200ft-lb of torque

this is 100% a software issue and needs to be addressed. if you know your vehicle can go 0-60 in X seconds you can gauge how much space you need to safely do cross 2 lanes of traffic then you stab the throttle and your truck just pulls you into traffic with 5% of the throttle you asked for and waits a few seconds that is definitely an issue.

 

There is no hesitation on my hybrid and there shouldn't be any on yours. Take it to a dealer that will get it fixed. It might take a few tries. Good luck.

 

I notice this as well and assumed it was a traction control thing. I notice it when I am pulling out and turning, thought it was because the computer thinks it is spinning the outside tire because of the larger turning radius. But as others have said I think I have plenty of time and then there is just no power until I get straightened out. I never have the issue when going in a straight line.

 

turbosix so your truck is broke always at the same spot? what does it do exactly?

 

it doesn't do it every time. it's done it maybe 5-6 times so maybe like once a month since i WFH 4 days a week.

leaving my neighborhood to go to work (again, truck is warm) i come up to a stop sign. i have to cross 2 lanes of opposing traffic and then make a left into one of the other two lanes.

normally this is not an issue but those handful of times i hit the throttle going straight. again, i'm not a dickhead so i'm not cutting it close but instead of 25-50% throttle or whatever it literally just kinda rolls forward at like 5% throttle and i'm just slowly rolling across two lanes wondering wtf the truck is doing until it finally decides a few seconds later to apply the power i wanted it to.

i thought i was going crazy but i saw this thread and at least i know it's not just me.

 

hmm weird. yea take it in and make sure they at least document it on a repair order. even it they cannot duplicate it. at GM we have what is called a no duplicate labor time . for whenever we have a customer come in and have a problem we cannot duplicate. that goes to GM and eventually if there is enough of them theyll look realize/ look more into it. im sure toyota has a similar thing.
having a very good description of the problem and exactly when it does it really helps also.

when does it do it?
how does it do it?
how far into the drive was it? miles and time?
was this the first drive of day?
was it wet out?
what was the temp?
were you completely stopped and then accelerating?
were you steering at the same time?

tell them all this and more.

 

Yes i experience this and it also chooses too high of gear if your also merging uphill. I power brake it a bit or manually shift it to first gear.

 

Adding my post from a transmission thread.....

This exact behavior is why I ended the lease early on a 2023 Tundra and moved to a Tacoma.

VERY pronounced in the Tundra (SR5 twin turbo 6), and happened about a quarter of the time. From a dead stop, if you depressed the accelerator aggressively, the truck would do a small lurch, and then just coast at a couple mph. After anywhere from a second to three (yes three), the truck would suddenly "wake up" and accelerate as normal.

It would do this about 25% of the time, and I was able to replicate it for the dealership techs twice. All they ever did was tell me there was not TSB for it, and then reflash the ECU.

Initially we had a few close calls, especially turning left in intersections under an unprotected green light. That happened twice before I learned not to trust the truck to accelerate reliably. After all the games with Toyota, I traded it on a Tacoma.

I'm not happy to hear about this same behavior in a taco. FWIW, it hasn't yet happened to me in my 24 OR Hybrid.

 

Sorry to hear this. We had a Mercedes Sprinter 2016 4x4 and they had a similar issue. Turbo lag. It took a second for the turbo actuator to spool up on demand. This left things kinda precarious and unpredictable when you really needed certainty. Ultimately a pedal controller and a tune helped a bit but never really solved it. That’s one of the reasons I went back to a manual transmission in my 2023 Tacoma. No more uncertainty.

 

This is 100% not a turbo lag issue. The engine doesn't even attempt to rev. This is likely a software issue.

 

it may be what they call torque smoothing, or what is used to prevent driveline banging or driveline slack build up. so since these trucks have a lot of power down low. if they let you have it all right way youd be complaining that every time you give it all the beans it just does a burn out or the traction control is active. so they keep 100% throttle held back till truck is already moving...
this is also why the trucks dont feel as fast as the HP/TQ numbers suggest. especially the hybrids. i know mine is most impressive between 20-70mph pull onto an on ramp.. thats when it actually feels like it has stated hp specs.

 

Add a nitrous oxide system.

 

https://www.youtube.com/watch?v=K7LlkukE_6k

 

Sounds like it needs to go to the service center for evaluation. I can’t imagine trying to cross 380 with that issue.

 

Could this be related to "acceleration suppression"? The owner's manual states "if the accelerator pedal is strongly depressed and the system determines that there is a possibility of a collision, engine output will be restrained or the brakes will be applied weakly to restrict acceleration." The manual also states a buzzer will sound, but if you have music playing or you're so focused on traffic, you might be missing the buzzer. This only applies to automatics. If you haven't already, take a look at page 254.

 

That buzzer will turn down the radio a good bit, can't miss it.

 

Everything else seems to fit.