Engine buzzing intermittently when shut off - Alfa Romeo Stelvio Forum
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post #1 of 24 (permalink) Old 03-26-2019, 10:37 PM Thread Starter
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Drove the Stelvio back from work(1 hour drive) after an hour I went outside and I could here this intermittent buzzing coming from the engine,(the engine was shut off). After starting the engine and letting it run for a few minutes and shutting it off, the buzzing disappeared. Any ideas what this could be? https://youtu.be/YmFmivULqC8

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post #2 of 24 (permalink) Old 03-26-2019, 10:42 PM
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I get something very similar, but doesn't cut off like that.
After shutting off the engine, maybe 20-30 seconds later, I get 5 seconds of buzzing (a bit deeper tone than the sound from your video though).
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post #3 of 24 (permalink) Old 03-26-2019, 11:04 PM
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That doesn't sound great....

Like an electric motor binding maybe??

Or encountering more resistance than expected...

Not normal at least. Deaper trip probably, sorry...

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post #4 of 24 (permalink) Old 03-27-2019, 10:35 AM
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Quote:
Originally Posted by STLV View Post
I get something very similar, but doesn't cut off like that.
After shutting off the engine, maybe 20-30 seconds later, I get 5 seconds of buzzing (a bit deeper tone than the sound from your video though).
We all get a deep hum after shutdown. This has been discussed in other areas of the forum. Your sound is a higher pitched beep. That is different. On the other hand, lots of stuff happens that doesn't recur after a shutdown and start up. But the beep is different than what has been on the forum..
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post #5 of 24 (permalink) Old 03-27-2019, 06:28 PM
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Sorry for any confusion, I was replying to Jpizzo and the beep. Couldn't find the edit button today for some reason.
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post #6 of 24 (permalink) Old 03-27-2019, 10:32 PM
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I was perusing the Owner's Manual and I noticed an odd suggestion on page 141. Maybe this will alleviate your buzzing problem?
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post #7 of 24 (permalink) Old 03-28-2019, 12:01 PM
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Unfortunately that's one of the drawbacks of a turbo charger .... it needs to be cooled. But you dont need to sit in your car for 3 to 5 min after reaching your destination. Just make sure that a mile or two before your final stop the turbo is not under load. Try to coast it home. In other words dont drive it hard right before stopping and then shutting it down. This is especially true if you are travelling in hills and steep climbs when you have the turbo under load. When that turbo is humming at 10, 20, 30000 rpm (or whatever it is) and you shut off the oil supply to it .... well do the Math. Try to practice this behavior and make it routine every time and all the time.
So this makes the disabling of the auto start/stop very important if you are driving it hard. You cant/shouldnt come up with a situation that after driving hard you stop at a traffic light and have the engine shutoff. Most modern turbos have a turbo timer, where after a shutoff of the engine, the oil cooling pump still runs for a bit.
Personally i still practice the old routine of coasting home about a mile before shutting it down and not worry about it. I do it as a routine behavior now and dont even think about it. Its in my DNA now(no pun intended)!
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post #8 of 24 (permalink) Old 03-28-2019, 12:31 PM
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The sound that Jpizzo is experiencing seems more significant than the turbos needing to be cooled/lubricated doesn’t it? I do think Marco has great insight too though.

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post #9 of 24 (permalink) Old 03-28-2019, 04:11 PM
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Quote:
Originally Posted by Jpizzo View Post
Drove the Stelvio back from work(1 hour drive) after an hour I went outside and I could here this intermittent buzzing coming from the engine,(the engine was shut off). After starting the engine and letting it run for a few minutes and shutting it off, the buzzing disappeared. Any ideas what this could be? https://youtu.be/YmFmivULqC8
Hi Jpizzo,
WE understand why this may be concerning. We recommend having your dealer look into this if it continues to happen. You may also send us a private message and we will have this documented and provide you with additional assistance while your vehicle is at the dealer.
Lydia
Alfa Romeo Social Care Specialist
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post #10 of 24 (permalink) Old 03-28-2019, 04:39 PM
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Quote:
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Hi Jpizzo,
WE understand why this may be concerning. We recommend having your dealer look into this if it continues to happen. You may also send us a private message and we will have this documented and provide you with additional assistance while your vehicle is at the dealer.
Lydia
Alfa Romeo Social Care Specialist
^^^^^^^ what Lydia said.


If it is still doing that..get to the dealer.


That is not the cooling pump for the turbo, unless the pump for the turbo is binding/encountering resistance of some kind. If that is the case it will eventually lead to turbo failure and engine problems. This would be covered under warranty most likely...however it will take a long time to repair versus if you get to it quickly before any damage happens it will be quick and easy probably. (depends on the diagnosis...that noise could be a lot of things...none of them good.)


If the noise stopped, cool. Enjoy your car.


If not...GET TO THE DEALER ASAP. Then enjoy your car.....


Hope you get this solved quickly and easily.


@Marco 's advice about turbo's is very good..however the car does circulate oil after shutoff...including if the auto start/stop system activates, so it is less of an issue than it was 10-15 years ago when it come to cooling the turbo down. Warming it up though is still an issue. The turbo is not lubricated when the engine first starts up and it takes a second to fully circulate the oil into the turbo and get all the parts lubricated for use. For this reason you should not drive the car hard, keep the revs low and use of the turbo limited for the first couple minutes of driving. Revving a turbo engine hard right after start up causes more wear in 30 seconds than driving for an hour at 80mph. Remembering to coast home is good, so is remembering to drive easy for the first couple minutes. (Full disclosure...this is the greatest weakness in my driving habits...I have a lead foot and have to remind myself to go easy everytime I start the car...sometimes I forget...Ok, Ok, most of the time I forget...then remind myself after I start hard acceleration at takeoff...)

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Last edited by ALFAOFFROAD; 03-28-2019 at 04:50 PM.
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