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Coatgallou
Posts: 232
Joined: Sat Oct 31, 2020 7:53 pm

Post by Coatgallou »

During the stop-start procedure, the whole car electronics remain live so, if the noise is associated with shutting down of the electronics, wouldn't expect to hear it.

DaPa
Posts: 54
Joined: Sun Dec 13, 2020 8:21 am

Post by DaPa »

I originally thought it was turbo whine but at start/stop the turbo is not running I assume, therefore I believe it is not the turbo whine
GRANDLANDX68
Posts: 1225
Joined: Tue Nov 26, 2019 6:53 pm

Post by GRANDLANDX68 »

It might be the water pump. I had this once in a Peugeot 207 that made a noise once I had turned the car off only for a few seconds.
Vauxhall Grandland X 2018 68 1.2 Elite Nav in Moonstone Grey with Intelligrip Adaptive Traction System
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Coatgallou
Posts: 232
Joined: Sat Oct 31, 2020 7:53 pm

Post by Coatgallou »

The turbo runs when the engine is running and is turned by exhaust gas. On switching off, the turbo will 'free run' for a few seconds.
The water pump is driven by belt so will stop when the engine stops, eliminating this as the possible culprit, certainly for the noise you describe.
DaPa
Posts: 54
Joined: Sun Dec 13, 2020 8:21 am

Post by DaPa »

GRANDLANDX68 wrote: Mon Dec 21, 2020 1:49 pm It might be the water pump. I had this once in a Peugeot 207 that made a noise once I had turned the car off only for a few seconds.
Would that mean there is an issue with the water pump, the car has done 1,100 miles?
Coatgallou
Posts: 232
Joined: Sat Oct 31, 2020 7:53 pm

Post by Coatgallou »

Faulty water pump would possibly be noisy when engine running and/or allowing overheat of the engine. Not impossible to be faulty but as its driven by belt, when engine stops the pump stops.
Coatgallou
Posts: 232
Joined: Sat Oct 31, 2020 7:53 pm

Post by Coatgallou »

The turbo is driven by exhaust gas and speeds up as and when the gas volume increases. At tick over it is spinning 'slowly'. It is basically a fan, blow at it and it spins, stop blowing and it slows to a stop. Therefore possible to hear it on switch off.
DaPa
Posts: 54
Joined: Sun Dec 13, 2020 8:21 am

Post by DaPa »

Coatgallou wrote: Mon Dec 21, 2020 2:06 pm The turbo is driven by exhaust gas and speeds up as and when the gas volume increases. At tick over it is spinning 'slowly'. It is basically a fan, blow at it and it spins, stop blowing and it slows to a stop. Therefore possible to hear it on switch off.
But when the car start/stops it can't be heard, I would of thought the turbo would be inactive whilst in start/stop.
GRANDLANDX68
Posts: 1225
Joined: Tue Nov 26, 2019 6:53 pm

Post by GRANDLANDX68 »

The water pump still made a noise on my car only a few seconds after the car was turned off it was like a hum noise as in it was slowing down to turn off. I would try and get a video of the sound and get the car booked into the dealership. Explain you have a video of the noise and see what they say.
Vauxhall Grandland X 2018 68 1.2 Elite Nav in Moonstone Grey with Intelligrip Adaptive Traction System
Grandland Global Forum Moderator
Coatgallou
Posts: 232
Joined: Sat Oct 31, 2020 7:53 pm

Post by Coatgallou »

Right, I see what you are saying. Not Checked mine to see if it doesn't do it in stop-start mode.
But, I have the noise after switching off, consider it normal.
Car currently with under 600 miles on clock.
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