CT4-V Blackwing Manual Transmission Engine Revving

[SML604]

Hi all,

Sorry about resurrecting an old thread, but has anyone uncovered anything more about this issue?

I have had this happen a few times in my car (2024 4BW Manual) - always in first gear at low speed with no rev match enabled. It typically happens when I am crawling in first gear (like into a parking spot), and then I clutch in - but the revs not only don't drop - but actually climb to ~2k or so. The last few times it's happened, I have actively double checked that my foot wasn't brushing the accelerator (It hasn't touched it).

I had a particularly odd experience with this today. I was taking my kid to school and got stopped on a particularly steep hill. I was in stop and go mode due to a four-way stop at the top in the hill; I started moving , came off the clutch and gave the car a bit of gas and then clutched in again to stop again. At that time, the engine revs started climbing, ultimately peaking at 3000 rpm. I had my foot on the clutch and break, and again double checked I wasn't touching the accelerator (it wasn't at all!). It spun up (I.e. it wasn't sticking) to 3k and stayed there for a second or so. Needless to say, I was a little spooked. I am not sure what it would have done if I touched the throttle, but this conjures up some concerns around unintended acceleration, especially if you aren't attentive.

It feels like a software issue, and maybe it is an anti-stall thing, but it definitely seems odd.

Any ideas?

 

[RDATLTE]

Sounds like an oddity with rev match assuming it's activated. If so, turn rev match off and see it it still occurs.

 

[1Evil55]

I've noticed mine do this a few times over the last few months of ownership. Rev match is always on for me. Creeping is when it seems to always happen. It hasn't happened often enough to think its a problem really. The first time I think I was wearing Ugg boots which are bulky and assumed my foot was on the gas. When it happened the next couple times I physically looked down thinking something was hitting the accelerator but found nothing. McD's drive through was the last place come to think of it which would have been a couple months ago. I reward myself with it every few months in a crunch. Not my typical meal.

 

[SML604]

Sounds like an oddity with rev match assuming it's activated. If so, turn rev match off and see it it still occurs.

Rev match is not on. I rarely use it at all.
And even if it was on, a clutch in when I am in first shouldn't necessarily trigger it.

 

[LastGas]

Almost 2 years after my first post on this thread, and still experiencing the same high idle issue in those sorts of situations. Never using rev match. I have a Corsa exhaust now, and a side effects of a louder exhaust is realizing how often the idle speed does something wacky. It's a small hiccup in an otherwise good powertrain experience.

 

[SML604]

Almost 2 years after my first post on this thread, and still experiencing the same high idle issue in those sorts of situations. Never using rev match. I have a Corsa exhaust now, and a side effects of a louder exhaust is realizing how often the idle speed does something wacky. It's a small hiccup in an otherwise good powertrain experience.

Have you raised it with the dealer? Has it gotten any worse?

 

[LastGas]

Hasn't gotten worse and didn't talk to the dealer. it's just something the car has consistently done in certain rare but predictable situations. Based on talking to other owners, it sounds like all the CT4s do the same thing so I can only guess it's part of the cars programming, for whatever reason. It's not something that surfaces in everyday traffic. It's just in the situations where you're on and off the clutch like trying to creep over a big speed bump. For those reasons I never brought it up with the dealer.

Probably 90% of drivers wouldn't notice this. We are just a group of drivers who enjoy and take pride in being a decent manual transmission user so we find these bugs.

And not making excuses for Cadillac, but it seems like quite a lot of cars today have janky throttle and transmission calibration (looking at you Honda).

 

[shbox]

Have you raised it with the dealer? Has it gotten any worse?

Good luck trying to get a dealer to duplicate the concern.