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diceman
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Joined: 24 Sep 2018
Posts: 15



PostPosted: Thu Sep 05, 2019 1:36 pm    Post subject: Air leak noise (Engine/PSE) - Diagnosis/Guidance requested. Reply with quote

If anybody could offer pointers on what to check it would be greatly appreciated.

I believe this only happens with PSE activated so suspect it may actually be a vacuum hose blown off somewhere or is normal and just releasing excessive vacuum (an oxymoron but I can't think how better to describe it at present).

It sounds akin to a turbo car dump valve (vent to atmos type) and isn't consistent in volume or presence but comes and goes I believe with the switch points of the PSE (speed based I believe).

PSE appears to be working fine and maintains quietness when not active and switches form loud to quiet and back around the correct speeds suggested. I've yet to test for vacuum leaks and have yet to find a thorough PSE/Engine Vacuum diagram to reference to guide me.

Any thoughts?
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7161
Location: Brighton


PostPosted: Thu Sep 05, 2019 6:46 pm    Post subject: Reply with quote

If there was an air leak on the PSE system then it wouldn't work .. you also would never hear it so i'm kinda ruling that one out .

Stupid idea but when the noise is there then turn off the a/c and see if it goes .. low a/c gas often causes noises that sound like this .

To get this type of noise then temp at 19.5 , fan speed 3 then sit an listen on idle for a good few mins .

In short a sound clip of the noise would help .. i assume it's only when inside the car and not outside ?

Sound clips to here if you can't post on youtube and i'll do it for you .


De.Mort@virginmedia.com
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diceman
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Joined: 24 Sep 2018
Posts: 15



PostPosted: Thu Sep 05, 2019 9:29 pm    Post subject: Reply with quote

Hmm I hadn’t considered the ac _ thank you.

I’d say the noise is more likely from outside and only when moving (I will reserve final comment until another drive but I think it was was mainly when lifting off at higher rpm it’s noisiest but will check).

Thank you for your suggestions, I’ll try and get an audio clip Smile
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