Tundra engine recall - interesting news

There are numerous threads about this. Most reports claim to have a random 1-2 second lag between pressing the throttle and the truck actually moving from a complete stop, or a slow rolling stop. It appears to be most frequent right after a cold startup and while trying to quickly accelerate.

There is a TSB out on it, but many claim it hasn't fixed their hesitation issues.

There also doesn't seem to be any rhyme or reason to what trucks are affected by it. My '23 has never done it in almost 30K miles, fortunately,

 

Yeah, mine have been rolling stops. The first time I was entering a turn lane ready to turn left and continued to creep forward. I attempted to accelerate and there was that 1-2 second lag. Thankfully the closest oncoming traffic was a good ways back. Thankfully it has only happened a few times in 20k miles. I've definitely learned to be cautious when turning to make sure I have lots of room in this truck.

 

at least its not a ford, HA

thats the same as any truck forum has ever been, lol. Just the way it is

this place is great though.

I have a list of improvements for the tundra as well, so not all of us think its 100% perfect, nothing is nor ever will be

 

Ah for the good old days when the gas pedal was just hooked up to the carb and didn't think it was smarter than you.

And before any one says they don't miss carbs. We still own and ride regularly 2 carb'd motorcycles, and my 1950 International, all 3 run great and never have issues with them, and none of them hesitate when I give it throttle.

And as I mentioned in another post, we're back to just lousy software programming. Seriously don't understand why manufacturers can't get something as simple as throttle response right, after all these years.

 

this is when I get it , slow rolling stops. I thought the signs said Slight Tap On Pedal (STOP) anyways

 

So is it trying to shutdown for a stop, gets confused, then starts back up? Has anyone who defeated the Auto Stop/Start experienced the lag?

Wife just bought a Mercedes GLE and it doesn't experience any kind of lag with its Auto Stop/Start, thought I would hate it, but it's actually not intrusive at all and you don't know it's doing it. This is a mild hybrid though with the electric motor between the engine and trans so you have immediate acceleration from the electric motor while it waits for the actual engine to start. I could see how the delay could happen waiting for a restart with only an ICE to work with

 

Yes

 

ya, its not that, that goes off every time as part of the pre-flight check list.

the motor doesn't shut off, there is just a slight delay in throttle, I think the most recent theory is its not downshifting into 1st fast enough or calling for boost instead of trans position or something, there is a dude in that thread who knows way more and did testing, etc. Im no expert on it at all, I only get it from time to time

 

Do you guys think it's possible to start/stop feature is to blame for the motors issues?

 

No.

 

Not likely. I think the vast majority of Gen 3 owners turn that stupid auto stop/start feature off every time they start their engines. I know I do.

 

But...for what it is worth, and I have ZERO clue of what's really going on. The vast majority of 3rd gen owners are not having engines go.....??? And the owners manual says to let the engine idle for sometime (~1 minute) before shutting it down. But if its always shutting down at stop lights...wouldn't that be bad....??? Especially after driving highway???

 

For sure, my Ecoboost circulates coolant after shutdown to help cool turbos, but I have always let any engine idle for at least 30 secs to a minute after working. My tractor, motorcycles, they all get idled, only thing I don't bother idling is my pressure washer.

This whole stop/start thing is about saving pennies of fuel, NOT engine longevity.

 

Toyota has blamed it on transmission ecu programming. Makes sense. I’m willing to bet the truck is programmed to start in 2nd or 3rd gear for efficiency. When you stab the gas, it has to decide upon a gear to down shift to (1st or 2nd?) execute the shift and then add the power requested. The computers and the drive by wire take the slamming in and out of gears away, but create throttle lag. Daughters 9 speed ZF has some lag and poor gear choice maneuvers at times. Dern EPA. Does sport mode help take away the lag? Manually selected 1st gear to start?

 

https://youtu.be/EKRlBoj0s7E?si=rvhu8QiFAC7irTb1
9:50ish CCN talks about being able to cool the turbos after shutdown.

 

Indeed ...remember the rogue cop Christopher Dorner? ..drove a Titan and rear driveshaft took a dump while on the run. The 2nd gen Titans had many engines replaced due to cylinder scarring. Tundra is 100% better truck.

 

For what it's worth, after having the engine replaced in my 22’ Tundra under the recall, there is a significant difference in how my truck drives and responds, compared to what is was prior to the swap.

Look, some of you may argue this is just in my head, but I think the new engine has more power, period! I have used 91 octane for both. This new engine is way more peppy, smoother, and pulls harder. Just came back from camping at Yosemite. Coming back on 395, I was doing 95+ passing on hill climbs, fully loaded with 5 passengers and cargo, and 35” tires. The truck did not sweat at all. This was not the case with my original engine.

Another point, I run the truck in tow/haul mode. I think very necessary if you have larger tires. Tow/Haul mode forces the truck to run at least one gear lower compared to normal mode. This decreases the load on the engine and the main bearings. I think anyone with larger and heavier tires should run the truck in tow/haul mode, just my opinion!

Another thing, drivability and transmission tuning is better too.

 

95+ while towing?!?!

 

Also, let’s not spread incorrect information. Multiple failures reported on the Google sheet refer to failures on trucks that had rebuilds with a short block, not crate engine swaps!

Will be interesting to see if any of the crate engine swaps under the recall fail.

I also would disregard some early failures reported in less than 5k miles. Highly likely these failures are unrelated to the known main bearings issue, which arises in 20-60k miles.

 

Not towing, but a fully loaded bed with a flip tent on top. Passed a few Jeep Rubicons; I think they were: wtf, to say the least. LOL

 

I’m sure they were like, “WTF”. I guarantee they weren’t marveling at how fast and powerful your truck is.

 

Some small plastic ducks may or may not have been hurled.

 

95+ with 5 passengers, I assume a few of them were kids. Cool.

 

Exactly. Same people that make fun of me for keeping my truck and travel trailer at 60-65mph on the interstate or highways. "you'll get run over and killed!!" "It's too dangerous!!" This is why that may be true.

 

I run in Sport mode as my normal everyday go-to. It reduces the lag somewhat. It helps, but not a cure.

On my morning commute at 0-dark-thirty I have 3 stop signs in my quiet neighborhood before I get to an open road.
They are usually taken at a slow roll, maybe 5 mph or less. Can tell transmission is still in 2nd, maybe 3rd, when accelerating away.

I'm going to experiment having it in TOW mode for a few mornings and see if the downshift happens.

 

Would also experiment in manual mode when known lag inducing conditions exist and see if selecting your own gear eliminates it. Toyota clearly stated its a transmission related problem.

 

that’s kind of what I was getting at…..I originally thought a camper was involved. Either way, not sure I would push those limits especially with others in the car…..

 

The thing with manual mode (and electronic shifting in general):
You can command it, doesn't mean you're going to get it.

(I will try though.)

 

I considered a Ridgeline but it seems a bit too small. The bed is over a foot shorter than a 2nd gen doublecab, which is what I'm after. It would be a challenge to do basic things in a bed that's just over 5' long, such as haul mine and my daughter's bicycles.

Also not a fan whatsoever of all the modern tech stuffed into these things. Sure it doesn't have a turbo but there's direct injection, stop/start, and cylinder deactivation. Sure you could always turn off the stop/start by pushing a button every time you start it, but that's annoying. Could bypass the cylinder deactivation too but again that's a pain.

Nothing better than a 2nd gen Tundra for reliability. Why don't you guys just settle on a clean 19-21 and be done with it? Still has heated/cooled seats, still has a fantastic JBL sound system, still has soft leather seats, etc. What more do you want? I mean, the 5.7 isn't quite to the same level as the older 4.7 for extreme reliability but it does have the power, towing capacity and is infinitely better than having to be on edge everyday worrying about what new problem the 3.4 will have.

 

what? lol.

NO