Noise/vibration when turning at slow speed.

[cprcubed]

I thought that was only a feature of the new engine designs

Nope. See this thread: Cylinder activation/deactivation | 2021+ Ford Bronco Sport Forum - Broncosportforum.com
Cheers!

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[rms34208]

Is this a 2025 big bend? I thought that was only a feature of the new engine designs

No Sir, It is a 2023 ( Oct 2023) Big Bend

 

[RSH]

Cylinder deactivation happens at cruising speeds with the engine under light load. Now a few people have had the cylinder deactivation solenoid malfunction leaving the engine operating on 2 cylinders, if that were the case the vehicle would be sluggish and potentially rough all the time.
A shudder, vibration and or noise at low speed for example when turning into a parking lot or driveway is more likely an issue with the RDU. If still under warranty take it to Ford, have it diagnosed and have the TSB performed, if that doesn't work you will be getting a new RDU.
Some here have changed their own RDU oil and have also added friction modifier as a preventative measure and claim good results.

 

[Quashish]

Reason I would have never noticed the deactivation in our old 21 big bend was that I always had to have it in sport mode.

 

[OuterBanking]

Is the noise y'all are hearing a "thunk" when doing this? I have a 24 OBX with 5800 miles and its doing this every time i change direction and steer. The dealer already checked suspension (sounded like something would move then stop) and the tech on a ride along heard it from the rear whereas i hear it from the front in the driver seat. Any way to get it to do it consistently? I am worried that TSB says through MY 23, but mine being a 24 seems they shouldve fixed that problem

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