2021 Supra weird stutter on idle

[WITCH3R]

I just recently purchased a 2021 supra 3.0 with 10k on the ticker. When i picked it up i noticed it had the E85 smell. It does have bolt ons. I have noticed this weird stutter almost like a hickup at idle when i start it. Its suttle but quick to make the car shake a bit. Kinda like a missfire, however the car runs great. I did not notice this when i test drove it. Is this common? It had E85 in it but i put 91 in the tank and after about half tank i noticed this. Would the fuel selection be the issue?

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[zrk]

I just recently purchased a 2021 supra 3.0 with 10k on the ticker. When i picked it up i noticed it had the E85 smell. It does have bolt ons. I have noticed this weird stutter almost like a hickup at idle when i start it. Its suttle but quick to make the car shake a bit. Kinda like a missfire, however the car runs great. I did not notice this when i test drove it. Is this common? It had E85 in it but i put 91 in the tank and after about half tank i noticed this. Would the fuel selection be the issue?

Is it tuned?

 

[WITCH3R]

Is it tuned?

That i do not know. Unfortunately i have no information on this. I purchased it used from a local Dealership. I thought maybe it was tuned with E85, but i do not know.

 

[zrk]

That i do not know. Unfortunately i have no information on this. I purchased it used from a local Dealership. I thought maybe it was tuned with E85, but i do not know.

You're gonna wanna find out if it's tuned. You can get the ECU flash count from any of the tuning dongles I believe. You really don't wanna be driving around with a tune you don't know about.

 

[Cheesedawg]

Tuned or not I can somewhat correlate this issue. Haven’t spent too much time trying to nail down exact conditions or causes but I have noticed what I think is the same stutter. My only mods are an exhaust, no downpipe, and some wind deflectors.
Sometimes on a cold start when I am sitting there checking my phone or something else that just has me sitting for a couple of minutes the idle is smooth as butter until an occasional and inconsistent sputter. Only happens after the high idle drops. Tach stays steady, but you can feel the vehicle shake and catch itself before going back to smooth. Happens on and off every 30 seconds to minute and an half or so. Sometime also happens when idling at a light or something, but most noticeable when just sitting idle after a cold start.
I have thus far just brushed it off, but might bring it up with the dealer at some point.

 

[travsam89]

Mine does the same thing, it has its little sputter moments at idle, nothing ive ever been concerned with. Im running ecutek 91 OTS tune

 

[WITCH3R]

Tuned or not I can somewhat correlate this issue. Haven’t spent too much time trying to nail down exact conditions or causes but I have noticed what I think is the same stutter. My only mods are an exhaust, no downpipe, and some wind deflectors.
Sometimes on a cold start when I am sitting there checking my phone or something else that just has me sitting for a couple of minutes the idle is smooth as butter until an occasional and inconsistent sputter. Only happens after the high idle drops. Tach stays steady, but you can feel the vehicle shake and catch itself before going back to smooth. Happens on and off every 30 seconds to minute and an half or so. Sometime also happens when idling at a light or something, but most noticeable when just sitting idle after a cold start.
I have thus far just brushed it off, but might bring it up with the dealer at some point.

Yes this is exactly what mine does.

 

[WITCH3R]

You're gonna wanna find out if it's tuned. You can get the ECU flash count from any of the tuning dongles I believe. You really don't wanna be driving around with a tune you don't know about.

Thats a great call. I will start the process of getting a dongle. Thank you.

 

[CUL8RSAM]

Mine does the same thing, it has its little sputter moments at idle, nothing ive ever been concerned with. Im running ecutek 91 OTS tune

Could be gas tank breather/ventilation valve. It sits on top of valve cover and is a stupid easy fix. Look it up.

 

[calebc]

Hi! Im fully stock and noticed this after I got my most recent oil change. Happened at 6k and now im at 8k miles, havent had issues.

 

[zrk]

Could be gas tank breather/ventilation valve. It sits on top of valve cover and is a stupid easy fix. Look it up.

Gas tank breather... in the engine bay?

 

[CUL8RSAM]

Gas tank breather... in the engine bay?

yes, Its the valve that sends those fumes in the engine for burning. The problem is it gets stuck open and can cause idle stutters. I had that issue, usually when you stop at a light or stop sign especially when you put in gas.



https://www.bimmerworld.com/Intake-...nk-Breather-Valve-for-B46-B48-B58-Engine.html

 

[WITCH3R]

Yea, seemed like he has a cel with his issue. Mine is only on the cold start. Goes away after the idle cuts down and it is warm. Never happens again until the next cold start.

 

[CUL8RSAM]

Yea, seemed like he has a cel with his issue. Mine is only on the cold start. Goes away after the idle cuts down and it is warm. Never happens again until the next cold start.

I had that issue and I never got any codes.

 

[Mason]

I get that on my stock car. Not a big deal

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