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Whistling noise while driving

P

porkchops

Monza
Joined
19 Jan 2018
Messages
181
So 4 weeks in the new c4s and the engine whistle pretty much consistently and pretty loud (high pitch whistle). My old one used to do that a bit but not consitently and not as loud. Anything to worry about?

Thanks
 
Have you checked to see if George Fornby is hiding in the back?
 
I'm no expert, but the AOS is known to whistle as air rushes past a split in the diaphragm?
 
I had an annoying whistle on mine and it turnef out to be a very slightly misaligned airbox.
Rick
 
Halcyon said:
I'm no expert, but the AOS is known to whistle as air rushes past a split in the diaphragm?
Click to expand...

Yup .. when it whistles take the oil filler cap off .. if it stops then AOS.


If you struggle to remove the cap then again its an AOS.
 
deMort said:
Halcyon said:
I'm no expert, but the AOS is known to whistle as air rushes past a split in the diaphragm?
Click to expand...

Yup .. when it whistles take the oil filler cap off .. if it stops then AOS.


If you struggle to remove the cap then again its an AOS.
Click to expand...

Thanks! Out of interest Is it possible to have a failing aos without smoke?
 
Yup .. Boxsters do it all the time .. no idea why its normally them but the whistleing and a hard to remove oil cap is a normal feature of an AOS on them .

EDIT ..

There are 2 types of AOS failure .. it can block or it can go totally open .. one causes smoke , the other a vacumn hence the noise .
 
deMort said:
Yup .. Boxsters do it all the time .. no idea why its normally them but the whistleing and a hard to remove oil cap is a normal feature of an AOS on them .

EDIT ..

There are 2 types of AOS failure .. it can block or it can go totally open .. one causes smoke , the other a vacumn hence the noise .
Click to expand...

Great thanks so is it necessary to fix asap? Or not as urgent?
 
If it was smokeing then i would say asap .. excessive oil in the cylinders can hydraulic .. serious damage at that point .. a blocked AOS doesnt allow Any crank gasses to get burnt .

Ive seen cars that have had this fault for monthes with no ill effect ..

In all honesty though i cant say that a fault is safe to leave what ever it may be .. i do this for a liveing so i am a little bit more liable than most of you here if i give incorrect advise .
 
deMort said:
If it was smokeing then i would say asap .. excessive oil in the cylinders can hydraulic .. serious damage at that point .. a blocked AOS doesnt allow Any crank gasses to get burnt .

Ive seen cars that have had this fault for monthes with no ill effect ..

In all honesty though i cant say that a fault is safe to leave what ever it may be .. i do this for a liveing so i am a little bit more liable than most of you here if i give incorrect advise .
Click to expand...

:thumb:

Great I will try and get it sort as soon as I can then
 
For the record, took the car to Matt at Fearnsports, it turns out it's the air con pump that is :pc:
 
Hooner said:
Don't worry be happy :lol:
Click to expand...
That was a rather good as an ear worm placement. Never saw it coming
 
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