Powerboost Squeal when going from electric to ICE?

[backcountryplatinum]

I have a 2022 Powerboost up here in Canada. In the last couple months I have noticed a squeal/squeak noise anytime the engine switches from electric to ICE. Happens 80% of the time and does not occur when its very cold (-40C).

Dealership couldn't diagnose since it was -40 and they couldn't replicate it - but said there are some turbo issues.

To me the noise sounds like a belt or a gear that is dry.

Anybody experience this?

EDIT: It's only when the ICE is engaged, any other weird turbo noises / shifting noises that have been reported are not it, that's a whole other issue lol!

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[Henfield]

Probably not tire squeal.......

I'd leave it with them, ask them to put it inside the shop overnight. Then start it. If its as reliable in happening as you say it should happen. However, Plan B is waiting for warmer weather.

 

[backcountryplatinum]

Ha no, definitely not tire squeal.

It's happening constantly right now, have an appointment soon but curious if anyone else experienced it. Foreman said if its the turbos they have to replace both, which makes me nervous having them tinker in there...

 

[currybob]

Are they sure it is not a belt? When engine shuts down doesn't the belt stop and when the engine starts back up so does the accessory belt? If it were to slip then cause a noise...

Just a thought

 

[backcountryplatinum]

Are they sure it is not a belt? When engine shuts down doesn't the belt stop and when the engine starts back up so does the accessory belt? If it were to slip then cause a noise...

Just a thought

It sounds like a belt. Any idea why the noise doesn't exist in cold temps?

 

[Snakebitten]

There IS a belt drive starter (yellow) on the Powerboost. It has a pretty hefty belt tensioning mechanism (green) for keeping the belt from slipping though.

However, the term "squeel" has been used for the same circumstances you describe and there turned out to be more than one source.

Transmission fluid level.
Turbo wastegate actuators.
Exhaust Heat Exchanger valve actuator.

Squeal is a subjective term and not all squeals are the same.

Good luck with your dealership. Hopefully you get a good technician and he/she zeros in on the culprit.
Be sure to report back please.

 

[Gros Ventre]

D---, I had not realized that tensioner was double... Guess the belt starting torque is a big one...

 

[currybob]

It sounds like a belt. Any idea why the noise doesn't exist in cold temps?

When a belt is cold it will not be as loose as when warm. Contracts more when cold and expands more when warm or hot. Check the belt tensioner, may be set to loose. It is suppose to keep the belt tight through all temps and conditions.

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