General 1.4L Multiair Pop squealing noise

[arekp]

Recently noticed an intermittent squealing / whistling noise from the engine bay. Can't pin point which region it is coming from.

I typically hear it at idle eg when stopped at traffic lights with AC turned on or off. Never heard it during driving, perhaps due to engine noise.

Timing belt, accessories belt, tensioner about 3 years old.

No error codes with MultiECUScan.

Video attached - AC was off for the video.

Any suggestions where this could be coming from?

 

[bugsymike]

Recently noticed an intermittent squealing / whistling noise from the engine bay. Can't pin point which region it is coming from.

I typically hear it at idle eg when stopped at traffic lights with AC turned on or off. Never heard it during driving, perhaps due to engine noise.

Timing belt, accessories belt, tensioner about 3 years old.

No error codes with MultiECUScan.

Video attached - AC was off for the video.

Any suggestions where this could be coming from?

Sounds like a tensioner bearing , possibly on the guide for the auxilary belts, assuming no belts loose.
You could try spraying something like WD40 in the area noise is coming from to locate better.
Note it is not a cure and will soon wear off. Don't get it in your eyes whilst looking in that area.

 

[arekp]

Thanks @bugsymike, I replaced the auxiliary belt tensioner and no more noise. Also did the motor mount at same time.

 

[arekp]

Looks like I was too optimistic. Noise is still there.

Still not sure where it is coming from. Any other suggestions?

Is this sucking noise normal / related ?
500X sucking noise

There no error codes on multiECUScan

 

[bugsymike]

Looks like I was too optimistic. Noise is still there.

Still not sure where it is coming from. Any other suggestions?

Is this sucking noise normal / related ?
500X sucking noise

There no error codes on multiECUScan

Don't know enough about the Multiair to comment on sucking noise.
Re the squealing it is hard to pinpoint from the video, can you locate the direction better in person?

 

[The Panda Nut]

Alternator bearings?? They respond well to WD liggt oil spray. May need a few goes. More of a whistle and certainly sounds like a dry bearing somewhere.

 

[arekp]

Replaced the alternator clutch pulley (without removing the alternator)

Time will tell if this fixes the squeak.

DIY

PS there's no way WD40 would get anywhere near the bearings: these are well hidden

 

[arekp]

Unfortunately, the squeaky noise persists.

 

[bugsymike]

Unfortunately, the squeaky noise persists.

Can you use a "listening stick" long screwdriver, or stepthoscope, careful of moving parts obviously to locate the source of noise.
Things like alternators, powersteering pumps and waterpumps etc. going up close to the bearing area of the casting should pinpoint a noise and things like tensioner bearings on pulleys if very careful often the centre securing bolt is stationary so a screwdriver etc. can be positioned on it.
I would say please be careful, as a screwdriver rammed into your ear may cause problems.

 

[arekp]

Haven't had any luck listening for where it's coming from, but thanks.