Whistling noise on idle

[Mk5_2.slow]

I have a 21 3.0 premium with 24k miles that is stock, I was taking a video to see engine movement at light revs since lately the car has vibration inside the cabin which seems confirmed in the video to be engine mounts, I also noticed a whistling sound that can be heard here but is worse in person. Any ideas?

Sponsored

 

[Thraxbert]

Every factory passenger car and engine has mounts that move under revs. Your engine mounts are fine.

Since the whistling moves with RPM, start looking at the intake system. Also buy a mechanic's stethoscope and start poking around. This is likely internet-undiagnosable from the information provided and the nature of the described issue.

 

[razorlab]

The whistle is your turbo compressor increasing in RPM with the revs.

All engines move on their mounts unless they are solid mounts.

The B58 moves around a bit more as the mounts are liquid filled.

 

[FitmentIndustries]

I have a 21 3.0 premium with 24k miles that is stock, I was taking a video to see engine movement at light revs since lately the car has vibration inside the cabin which seems confirmed in the video to be engine mounts, I also noticed a whistling sound that can be heard here but is worse in person. Any ideas?

Alright, so on a 2021 GR Supra 3.0, a little engine movement when you blip the throttle is actually pretty normal. These cars use soft BMW hydraulic mounts, so seeing the motor rock a bit on light revs doesn’t automatically mean they’re bad. At 24k miles and stock, blown mounts would be kinda early unless the car’s been beat on hard or soaked in oil. When mounts do go, you usually feel clunks, harsh thuds going into gear, or a really obvious jolt — not just vibration.


The whistling noise, though… that’s the thing I’d focus on.


On Supras, a whistle that’s worse in person than on video is almost always air-related, not mounts. Most common culprit by far is the PCV system. They’ll make this high-pitched tea-kettle type whistle at idle or light revs, sometimes with a buzzy vibration in the cabin. Super common on the B58.


Other possibilities are a small vacuum leak (intake boot, vacuum line, brake booster hose) or just normal turbo/intake noise, but since you’re saying it’s new and you’re feeling vibration, PCV or a vacuum leak is way more likely.


Easy stuff you can try:

• With the car warm and idling, crack the oil cap a bit. If the whistle changes or goes away, that’s a PCV hint.
• Pop the hood and listen — top of the engine usually points to PCV/vacuum, front of the engine is more intake/belt stuff.
• See if it’s worse cold vs hot.

Long story short: I wouldn’t jump straight to engine mounts yet. I’d chase the whistle first, because that kind of airflow issue can totally make the car feel rough inside even if nothing’s actually broken.

 

[razorlab]

Alright, so on a 2021 GR Supra 3.0,

Who talks like this. Okay ChatGPT.

Also, all those em dashes...

Can the vendors just stick to their corner and shill out rebranded alibaba products please.

 

[FitmentIndustries]

Who talks like this. Okay ChatGPT.

Also, all those em dashes...

Can the vendors just stick to their corner and shill out rebranded alibaba products please.

Nope.

 

[razorlab]

Nope.

 

[Mk5_2.slow]

The whistle is your turbo compressor increasing in RPM with the revs.

All engines move on their mounts unless they are solid mounts.

The B58 moves around a bit more as the mounts are liquid filled.

The whistling is there without the car being revved, and no the engine mounts are the stock hydraulic fluid filled ones.

 

[razorlab]

The whistling is there without the car being revved, and no the engine mounts are the stock hydraulic fluid filled ones.

Then it's probably the heat management module.

Sponsored