I have a persistent issue, and wonder if any of you have had the same problem. I have a 2024 Stingray Z51, with 3200 miles.

​​​​​​Around 55-60mph and 2000rpm - 6th gear - applying WOT produces no response. None.

It took me a while to even realize this, but once I did I realized it was persistent. At first I thought perhaps this was only with cruise control engaged, but it is no different with cruise control disengaged.

My limited research suggests it could be a problem with the MAF sensor or ECU. It doesn't seem the car has enough miles on it to consider it likely being an air filter, fuel filter, gas tank or spark plug issue, but I have not addressed those.

Any ideas?

TIA,
Bill

 

Just to make sure I understand - you are saying that with WOT it will not respond for regardless of how long you hold the throttle open, or are you describing a hesitation in response? Its not normal - sounds like a trip to the dealer. Its going to be difficult to speculate - there as so many things going on between the throttle and the engine - and sensors involved. And, if there is no DTC set, it will be difficult to diagnose. DTCs can be set that do not result in a MIL or message on a DIC.

 

If I am cruising at the prescribed conditions, and I floor it, there is no response, neither acceleration nor deceleration, like I did not push the pedal to the floor.

I know, it's odd.

This is my third Corvette over the last 16 years, and my 57th year of driving, and I have never experienced it. But before I make the trip to the dealer, I just wanted to reach out for other ideas.

Many thanks,
Bill

 

Unplug and reconnect connector behind petal, do the same thing at the throttle body, might help.

 

Here's some info on how the throttle control works. It's not going to help though. There should be a DTC set when the accelerator pedal angle or the requested power is not delivered. Looks like the pedal has redundant sensors too.

 

Are you in Drive when this happens? If so, Dealer time. Absolutely should not be a dead zone anywhere at low rpms.

 

I wouldn't do anything, just take it to the dealer. Could be something serious.

 

I appreciate everyone's input, and knowledge. I will take it to the dealer.

Oddly, it reminds me of an "issue" I experienced with the 2018 C7Z06 I last owned. It took me a while to get used to the time it took for the car to return to automatic control after a paddle shifter event. Occasionally I would over-rev because I thought it was still in automatic shift mode. That effectively left me with a similar dead throttle feel.

I don't mean to muddy the water, but I am a retired engineer and if I can't put my hands on it at least want to wrap my mind around it.

 

If you are in auto mode and had just used the paddles you can have that happen. I had the same situation and it can can take a little time for the trans to cycle back to auto mode. It is a weird feeling until you realize what is going on.

 

I had something similar happen to me. I was in drive mode but shifted with the paddles down to 6th and back up to 8th. Tried to go WOT and nothing happened. pushed the Manual Mode button and then Drive mode. Everything returned to normal.

 

What year? This still sounds like a bug, right? As you may know, the DCT anticipates the next gear and already pre-positions the fork on the opposite shaft, so that when the "gear change" actually happens, it simply disengages one clutch, and engages the the clutch on the opposite shaft. In 100 msec. If the operator does something the car did not anticipate, such as you described by changing gears manually as you did, there should be a slightly (very slightly) longer hesitation because the transmission must reposition the forks before the gear change can take place. But it should not persist - it should just be a brief hesitation. In fact, I have seen other posters describe that. A failure to respond to WOT for an extended period does not see normal.

 

2023. I definitely found it odd that it didn't take back over. I tried a few times and then went to Manual mode and back to Drive.

 

Andy, 3sacrowd and I had the same thing happen as I posted in #9 above. If you are in tour mode you can watch when the trans goes back to full auto mode after using the paddles by looking at the size of the "D" indicator in the windshield. It reduces in size when you pull either paddle and doesn't go back to full size auto immediately, it depends on how you are driving and the flatness of the road. It is not minuets but not instant and it varies. While in manual mode you can floor the pedal and nothing happens, no down shift, nothing. It is unsettling if you doesn't know what is happening and it is normal given what you are doing. 3sacrowd pointed out how you can get it back if you don't want to wait to go to full auto.

 

Does the car bog down like when you hit the rev limiter or does it just not respond in any way when you hit the throttle?

 

It a little hard to understand the symptom. What I am reading is that under certain conditions, when WOT is demanded, nothing happens, ever. If nothing happens for second or so, I can see that happening normally under certain conditions. But if nothing happens for 15 seconds, that does not seem normal - or if it is working 'as designed" it seems like a design flaw.

I can see it getting mixed signals from the driver and taking extra time to reposition the forks, but even that should take very little extra time. The clutches can disengage one shaft and engage the other in 100 msec. Normally the shift forks are preposition, so changing gears is just that 100 mesec. If the driver does something to call for a different gear than anticipated, the forks must be re-positioned. The maximum fork motion from one gear through neutral to the other gear is about 18 mm (same for all 5 of the forks). I don't know how long it takes to move the forks, but its not 15 seconds. I would guess its not even a second - a human can move shift forks that fast. So a lengthy or indefinite (not sure which we are talking about) delay would seem to be either a software bug or design issue.

 

Also, the OP did not say anything about having to be in temporary manual mode or anything about that. He said he was just cruising in 6th gear.

 

Just take it to the dealer, well that’s what I’d do

 

It's simple. If you are in auto mode and use the paddles you go to manual mode TEMPORARILY while using them. As I mentioned above, look at the size of the "D" in the Hud. The "D" goes to half size because it is in manual mode and if you stop using the paddles it will go to auto eventually and the "D" goes back to full size and auto mode. It is most notable in an upper gears like 6 or 7th. If you then floor the throttle for a down shift it doesn't happen, you then have no acceleration. It is just like a manual trans car that is in high gear and you push the gas and there is no response because the car needs a lower gear. It has nothing to do with the position of the forks etc. You just don't get a down shift to get acceleration. I had my car out yesterday and paddled down for a traffic circle and after exiting I paddled back up to 6th and it stayed in manual mode for almost a half mile and I tested flooring it and of course it didn't down shift for acceleration, it was waiting for me to use the paddles so it was "dead". If I just do nothing the car will go back to auto mode by itself and act accordingly but it doesn't go back to auto immediately. There is nothing wrong with the car, it is just responding for what IT thinks you want it to do. Try it as I described the next time you are out.

 

If mine is in temporary manual mode, and I floor it and do not shift with the paddle, yes, it will not upshift by itself for while, but it will run up to red line - it is responding to the throttle. I read the OP in post 1 as something different. He did not say anything about manual or temporary manual mode. He said there was no throttle response at all when he went to WOT.

 

^^^
Yep that was my 1st thought. I have that same issue when the car goes into Manual Mode because I used the downshift paddle. Normally when I leave ~70 mph traffic in a 4-lane divided highway I'm in Z-Mode. So folks don't have to slow for me when I make a turn to a narrow rural road, I apply the brakes aggressively before I the turn. It downshifts usually two gears Rev Matching each all in the blink of an eye. When I turn on the rural road and have modest throttle it upshifts quickly and drives normally.

However, if I am i MY Mode I will pull the downshift paddle usually twice while I brake. Usually in 3rd after I make the turn. BUT, because I pulled the downshift paddle, I am in Manual Mode for several seconds. So where in Z-Mode it would upshift in a second or less to 4th, then 5th because I used the downshift paddle it's in Manual Mode for several seconds, seems likre 5 at times. I usually pull the Upshift paddle rather than have the engine rev to ~4000 rpm.

Guess I don't understand If going 60 mph and using WOT why the car is not instantly downshifting. One reason I use Z-Mode is I don't like driving in say 7th gear when I expect to be turning or accelerating and having it downshift. In Z-Mode in my rural area seldom past 5th and very little automatic downshifting!

BTW, I never use Touring Mode. My Mode is set to Sport. Wonder if drive mode is a possible cause? BUT can't believe at 60 mph in 6th gear at WOT it doesn't downshift