Weird Issue with throttle

Hi everyone, wondering if anyone has had an issue similar to this or any ideas on what this could be.

I have sometimes had issues with the throttle having a delayed response after pressing on the gas. Mostly I've noticed it in stop and go style traffic and it seems worse in summer. For example ill be in stop and go traffic and the car in front of me moves a little, so i start pressing on the gas slowly and truck doesn't accelerate, just rolls forward. So i continue to press and then it seems to wake up and rev up too rapidly and jolt me forward. Almost seems like the truck doesn't realize the gas is being pressed and only realizes when the pedal is pressed like 25-30% of the way.

It doesn't always do this, seems really only at like stop and go or rolling traffic but its extremely annoying when as I just bounce back and forth instead of being able to cruise slowly/controllably till traffic stops again. It hasn't been as prevalent during winter but during the hot days in summer it was almost every time.

I am re-geared and tuned with the KDMax Tune as well. When I first got the tune everything was great, had no issues, super responsive. One day my truck was at the mechanic and they did something that caused the STOP fuse to blow and the truck wouldn't start. Replaced the fuse but since then I noticed this issue and some other electrical issues. Don't know if they're connected or not just thought I'd mention it.

Could it be a battery issue? Damaged wiring? Fuse issue. Could the blown fuse somehow have messed with the Tune? I only ask this cuz this issues and some other issues all seemed to start after that fuse blew and the truck wouldn't start. Some of the other issues have been laggy interface, delayed keyless unlock when grabbing the handle, sometimes have to pull the handle 2-3 times to get it to unlock, keyfob range is like 20'-30' for both my key fobs, and my N2 remote start kit disconnects from the app and cant be found.

Truck has less than 60K miles and is about 3.5 years old so its not brand new but not very old either. Am I being paranoid and should just chalk it up to time or could there be something causing it? Just feels weird these all started, or at least I started noticing them, after the fuse incident.

Any input or ideas would be greatly appreciated.

Thanks!

 

The dealership had adjusted my seat slightly fwd enough that I was dragging my right foot slightly on the carpet to the right, when accelerating, causing a similar feeling you described. I adjusted the seat rearward & payed attention to that & regained all the power. I hope your problem is as simple fix as this.

 

That seems like way too simple of a fix haha, I wish though. I've had my foot in multiple different positions, definitely feels like a throttle response issue

 

For my "issue" I was relieved to say the least.
Hopefully more chime in, good luck w resolution.

 

When you press the gas pedal in these weird situations, does the engine sound change and/or the RPM rise? Or are you saying absolutely nothing happens when you press the gad pedal?

I have a MT with no tune, but I have experienced behavior that sounds quasi like you describe. This is the first car I have owned with throttle by wire. The others were all mechanical. There are times when I think my gas pedal input is not causing the the throttle to open as much as I would expect. I suspect this is because the ECU is limiting the throttle to protect the engine or myself. Some of this behavior can be eliminated by turning off traction control, but I don't think all of it is. For example, I suspect it limits throttle in low RPM situations where more throttle would cause engine knock. I suspect this has nothing to do with your issue, but it sparked a thought.

More likely I suspect you are experiencing the normal AT behavior where sometimes there is a delay while it downshifts. The engine will rev up, but the torque converter will slip because the tranny is trying to shift. If you continue to add throttle it will simply increase the engine RPM. Then when it finally shifts, all that engine RPM is delivered to the wheels and the car jerks forward. With practice, you can mostly eliminate this by not adding throttle in mid-shift.

On a further thought, I think in modern vehicles this behavior has mostly eliminated by programming the ECU to limit throttle mid-shift. I owned a 2016 taco with a AT, but I don't remember any specifics about this behavior. My overall experience was that the 2016 taco AT was the best AT I had ever owned. I have mostly owned MTs.

In any case, you are highly unlikely to get a good answer from the internet. Have someone else drive the truck and give you a second opinion about whether it is normal behavior.

 

It has happened to me on my 2021. I have narrowed it down to trying to accelerate and braking at the same time. When I do this I get a notice on the dash telling me I am using both the gas and brake.

 

Were you trying to do a brake stand?

 

I do not get any light, and I am not braking and accelerating at the same time either. Interesting though never thought of that

 

Clean the maf sensor lately?

edit: and the throttle body while you're at it

 

The truck RPM is not increasing or downshifting as its usually after I press the gas after ive been on the brakes.

Maybe theres an issue with the fuse they used for brake light and so theres a delay and the computer thinks the truck is still in park. Ill have to try swapping the fuse for sure.

 

I cleaned the MAF sensor not too long ago. Maybe I made a mistake while cleaning it and re-installed it incorrectly or something. Ill try cleaning it again.

I dont think ive ever cleaned the throttle body ill look into that. Appreciate the ideas!

 

I’m skeptical that the MAF sensor or throttle body cleanliness had any effect on the gas pedal to throttle mapping.

Ditto for the truck thinking it’s in park.

 

No just trying to get into traffic, more of a dumb ass move.

 

My truck is Valley runner tuned My pedal is laggy when the truck is cold. Even after a moderate warmup it reacts the same way often, leaving my home, at the same spot on the street.

 

This fly by wire stuff is still pretty crappy. I think thats one of the things I hate about the Tacoma, the lack of feel of connection and control through the gas pedal. Its got no relation to a typical cable actuated system.

There doesnt seem to be any linearity, the spring is too tight for delicate control, its laggy. 80% pedal travel at 3000 rpm cant keep the speed maintained, but manually downshifting and using 20% pedal does fine.

I have no hopes the 24' will be better with a weezing 4 banger and more electronics.