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PostPosted: Wed May 26, 2021 8:09 am 
UKS Addict
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Joined: Mon Feb 19, 2007 4:12 pm
Posts: 9620
Location: Portsmouth
Car Models: 96 V4 & 9-3 Turbo-X
I am getting an odd rattle. It sounds almost like it is bubbling.

As far as I can tell, it is only present when the throttle is pressed, and it doesn't seem to be changing frequency or volume with either engine or road speed, but it can be harder to hear anything at higher speeds of either due to other noise in the cabin from the engine / road.
It comes back on the overrun when the car gets to slower road speeds, which i've interpreted as the throttle being opened to prevent stalling.
I can't hear it when the car is at rest, even if I rev the engine, so it seems to need some load on the engine, but the turbo isn't allowed to develop pressure when the car isn't moving either so that is a possibility.
I might have imagined it, but last night I though I head a grinding noise (similar to overworn brake pads) when on the overrun at higher speeds. I wasn't pressing the brake pedal so it wasn't that, and I don't know if the two are related.

My thoughts are:
something wrong with the inlet manifold, such as a leaking vac hose or similar;
a problem with the turbo;
a leaking exhaust manifold which sounds different to what I'm used to with a 4-pot engine;
a problem with the auto gearbox or some other part of the drivetrain (major potential for :argh:)

'75 96 V4 Anniversary Restoration Project
'09 9-3 Turbo-X Wagon No. 38
B204 Haynes Roadster Project

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