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Diagnose an odd noise for me (if possible)

Posted: Fri May 20, 2022 11:59 am
by ad_182_uk
Still getting used to the car so maybe this noise is something someone else may have heard / know what it is.

Scenario - front windows down due to being warm. Manual mode 2nd / 3rd gear going fairly slow 30mpg-ish. Press accelator and speed up slightly then let off the throttle just above 2000 rpm… almost straight after lifting off there is what sounds almost like a fly stuck in a window for a split moment coming from outside somewhere.

Perhaps it was a slightly metallic sounding noise like an exhuast rattle (miltek gpf back) but checked all clamps (apart from the reducer one going to gpf) and all tight. Also if i try and replicate but in park or neutral i dont get the noise - dont know if thats due to less actual ‘load’ being applied or it proves exhaust not the culprit.

The noise or buzz/rattle whatever can only be heard at like 2-3000 rev range when lifting off and it’s only for a tiny moment, but you know what it’s like when you hear something :shock:

Probably just nothing but thought i’d ask.

Re: Diagnose an odd noise for me (if possible)

Posted: Fri May 20, 2022 2:23 pm
by OomStu_ZA
Could it perhaps be the blow back valve?
https://www.youtube.com/watch?v=BFXIgME_5UA

Re: Diagnose an odd noise for me (if possible)

Posted: Fri May 20, 2022 3:52 pm
by ad_182_uk
OomStu_ZA wrote: Fri May 20, 2022 2:23 pm Could it perhaps be the blow back valve?
https://www.youtube.com/watch?v=BFXIgME_5UA
Don’t think so as theres a moment after letting off the accelerator before the noise as the revs begin to drop.