Throttle hesitation

[MoosieMoosie]

Question for all the people experiencing this issue, does it happen with VSC off? Basically is the stability control system pulling torque then ramping it back to normal?

Couldn’t answer you yesterday since I wanted to replicate the same environment again but this time with vsc partially off ( button pressed one time). In my case, the throttle input was completely normal with vsc partially off even after cold start, and the problem didn’t appear at all throughout the trip

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[SCZ4]

Anyone have this problem after a tune\remap? Unsure if it's hardware or software related?

 

[KBGT]

Couldn’t answer you yesterday since I wanted to replicate the same environment again but this time with vsc partially off ( button pressed one time). In my case, the throttle input was completely normal with vsc partially off even after cold start, and the problem didn’t appear at all throughout the trip

Driving in the snow and ice recently got me thinking about VSC aka traction control potentially causing this issue. After a drive on super slick snow/ice where VSC is modulating torque significantly, try driving onto a surface with good grip. It takes VSC a little while to "learn" that there is traction and it can ramp up torque.

My car is fairly modified at this point but has always had an intermittent hesitation regardless of the mod level. The only time I never experience the hesitation is with VSC completely off. I would be interested to know if others experience this hesitation with VSC completely off.

 

[HACKRCHILD]

It’s worth adding that another member was plugged in while this happened and reported that when this issue occurs the car throws an error regarding fuel pump response.

Maybe it’s traction going bonkers and cutting the fuel pump?

it would make sense, as the car doesn’t just straight up refuse throttle input….. it actually bogs down as if it’s being suffocated. My bet is there’s a communication problem between the fuel pump and ecu.

 

[SCZ4]

Think I contributed earlier in this thread, but I've now had it happen 4 or 5 times in 4000 miles (2019 car). It always happens pulling away from a complete stop with moderate throttle, certainly not enough for the traction or stability control to kick in. 90% of my driving is in Sport move with traction and stability activated. Was hoping a MHD remap might help, but not convinced.

 

[S2k]

Think I contributed earlier in this thread, but I've now had it happen 4 or 5 times in 4000 miles (2019 car). It always happens pulling away from a complete stop with moderate throttle, certainly not enough for the traction or stability control to kick in. 90% of my driving is in Sport move with traction and stability activated. Was hoping a MHD remap might help, but not convinced.

I have also experienced this several times now on my 2019 with stock ECU. It always picks the worst times to do it. (which seems mainly when trying to get onto a rush hour traffic roundabout) It may be related to a higher throttle input, but it isn’t like a flooring/traction control type thing.. There was fix post which involved getting a patch from BMW, but that seemed to involve a lot of persuading Toyota to do it. I’m hoping Toyota does something official, but if it only affects the early cars, I’m not holding up much hope. I was planning to BM3 so would be interesting to know if re-maps fix this.

 

[KBG]

I've had this happen 2x now within the last 30 days. First time it happened was after a 45min interstate drive and turned off/parked for 15min. 2nd time was this morning after a 1hr interstate drive and sitting at a traffic light for a few minutes. Initial pedal input resulted in the car "bogging down". I pinned the pedal and the car started to move and change gears but felt like I was barely applying any input. 2021 w/stock tune

 

[Skebs]

Something that's helped for me is lightly reving the car before driving. I mean like quick taps after getting the car warm, like 2-3 times.

 

[Supra_UK_]

Found this interesting section of a toyota article relating to TC mapping in 1st gear that may affect MTs in regard to ths topic of this thread:

 

[CFactor]

Just happened to me literally 4 times in a row in my neighborhood.

Pulled off to the side, let it finish warming up, did a couple light acceleration/full stop cycles and it then proceeded to drive perfectly fine.

Had my kid in the car too on this one so pretty annoyed. Glad I wasn’t on public roads yet.

 

[Vertex]

I just wanted to throw in my 2¢ on this topic. I've had my Supra since December of 2023 and talk a lot to a very good buddy who also has one and he's had his car since September I believe of 2021.

I've had an issue happen a few times where shortly after I've started the car and started driving it I come up to a stop sign and then try to take off or try to take off from a stop in general like backing out of my garage even, and the car basically is hardly moving until the RPM's hit around 2000; then the car will kind've zip away without issue.

My buddy told me that it seems to be something to do with sport mode and the car not jiving right with something till it has been driven a few miles after startup. This, so far, does not seem to matter how long the car sits after it has been driven and also does not seem to matter how far/long the car has been driven either to cause this problem to happen.

I've tested it myself a few times and every time I start up and drive the car for the first few miles or until I know I won't be coming to a stop for a bit I only keep the car in normal mode. I'm guessing there is something that changes with the "engine" part of the sport mode tune that the car just doesn't like right away. I typically have transmission on normal for my commute and only swap it back to sport for fun driving or when I want to change it over zipping around town.

I actually had my car completely stall out one time after leaving the grocery store(auto) due to this problem as well which was a first for me cause typically it just has the poor pedal response till I get going. Not sure there will ever be a remedy for this unfortunately.

 

[Loco38SUP]

I just wanted to throw in my 2¢ on this topic. I've had my Supra since December of 2023 and talk a lot to a very good buddy who also has one and he's had his car since September I believe of 2021.

I've had an issue happen a few times where shortly after I've started the car and started driving it I come up to a stop sign and then try to take off or try to take off from a stop in general like backing out of my garage even, and the car basically is hardly moving until the RPM's hit around 2000; then the car will kind've zip away without issue.

My buddy told me that it seems to be something to do with sport mode and the car not jiving right with something till it has been driven a few miles after startup. This, so far, does not seem to matter how long the car sits after it has been driven and also does not seem to matter how far/long the car has been driven either to cause this problem to happen.

I've tested it myself a few times and every time I start up and drive the car for the first few miles or until I know I won't be coming to a stop for a bit I only keep the car in normal mode. I'm guessing there is something that changes with the "engine" part of the sport mode tune that the car just doesn't like right away. I typically have transmission on normal for my commute and only swap it back to sport for fun driving or when I want to change it over zipping around town.

I actually had my car completely stall out one time after leaving the grocery store(auto) due to this problem as well which was a first for me cause typically it just has the poor pedal response till I get going. Not sure there will ever be a remedy for this unfortunately.

Mine does it in normal mode if I start it cold or warm and try to take off too fast. Now I just let it warm up a few minutes and no problems at all.

-RJM

 

[J29DB03]

I guess the answer is always use launch control everywhere, every time. Easy peasy.

 

[Vertex]

I guess the answer is always use launch control everywhere, every time. Easy peasy.

Actually when I was auto crossing with my buddy, any time we shut the car off he or I would pretty much do that just to make sure there was no hesitation with the throttle so that when we got up to the line there wasn't an issue when launching

 

[bushido]

Actually when I was auto crossing with my buddy, any time we shut the car off he or I would pretty much do that just to make sure there was no hesitation with the throttle so that when we got up to the line there wasn't an issue when launching

launch in second gear. thank me later

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