Stuttering Idle?

[Lyfe.In.A.Supra]

Hey All, I'm a new owner of a 2021 GR Supra with the Gen2 B58. I've noticed that when I'm idling I'll randomly have a "Stutter" that vibrates the car then recovers. My RPMs drop maybe 100 each time this happens and it just recently started happening. I've bought this car from a BMW dealer and the car came with 36k miles. I've always heard about how realiable the b58 platform is and didn't feel like the mileage should matter since the car was also a lease (I'm assuming Toyota does free oil changes to leases still). I'll attach an idle bootmod datalog down below.

The sudden RPM drop and recover happens randomly when stopped at a light or in park while in the driveway. Engine sounds healthy apart from the loudness of a b58. I'm assuming it's the VANOS system needing to be replaced or cleaned but I want to get some other opinions if anyone has experienced this before.

I am currently under Drivetrain warranty with Toyota but that'll take ages to get my car fixed / warrantied.

Bootmod Log while in park. - https://bootmod3.net/log?id=6547fc46feb9f805308761a7
Video of sound / vibration - (Should be attached to this thread)

I've owned this car 2 weeks and have everything stock. Car does not throw a CEL

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[mikeag96]

My '21 does the same thing pretty much since I got it. It's more noticeable Acker running the car pretty hard.

 

[MYA90SUPRA]

Hey All, I'm a new owner of a 2021 GR Supra with the Gen2 B58. I've noticed that when I'm idling I'll randomly have a "Stutter" that vibrates the car then recovers. My RPMs drop maybe 100 each time this happens and it just recently started happening. I've bought this car from a BMW dealer and the car came with 36k miles. I've always heard about how realiable the b58 platform is and didn't feel like the mileage should matter since the car was also a lease (I'm assuming Toyota does free oil changes to leases still). I'll attach an idle bootmod datalog down below.

The sudden RPM drop and recover happens randomly when stopped at a light or in park while in the driveway. Engine sounds healthy apart from the loudness of a b58. I'm assuming it's the VANOS system needing to be replaced or cleaned but I want to get some other opinions if anyone has experienced this before.

I am currently under Drivetrain warranty with Toyota but that'll take ages to get my car fixed / warrantied.

Bootmod Log while in park. - https://bootmod3.net/log?id=6547fc46feb9f805308761a7
Video of sound / vibration - (Should be attached to this thread)

I've owned this car 2 weeks and have everything stock. Car does not throw a CEL

Was your ac on or defrost. That could be the ac kicking in and out.

 

[Lyfe.In.A.Supra]

Was your ac on or defrost. That could be the ac kicking in and out.

I did run the AC on the way back from Vegas (Las Vegas -> California) and then the problem started. In the video I do not have AC on or defrost. Climate is off.

Edit: The stutter has stopped.... somehow? I recently went out on a limb and turned the AC on and back off, turned the car off for an hour then back on and started a data log. There's no stutter. I datalogged for 171 seconds and nothing was off about the idle.

 

[Chris_a90]

My 2023 does it I bought it since new

seems normal

 

[Lyfe.In.A.Supra]

My 2023 does it I bought it since new

seems normal

It's not normal imo. It now has went away somehow but a new problem has arrived. Sluggish acceleration in 1st.

 

[Chris_a90]

It's not normal imo. It now has went away somehow but a new problem has arrived. Sluggish acceleration in 1st.

Okay

 

[JoshuaQ]

It's not normal imo. It now has went away somehow but a new problem has arrived. Sluggish acceleration in 1st.

This happens from time to time. Not fun, not cool, but idk, I just expect cars to be annoying with all the tech and all my cars had some oddities that I chalk up to tech.

 

[Spart]

My 23 does this very rarely. Car has no mods that would effect the drivetrain and ~2500ish miles.

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