Issue resolved

[Chase]

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Edited April 16, 2018 by Chase

[IZichard]

Can you get a video of the noise? I had the same thought as you, belt or loose pulley but if you have already checked those I'm not sure. Not wining sound of an tired P/S pump is it?

[Chase]

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Edited April 16, 2018 by Chase

[IZichard]

Just now, Chase said:

Yes, I'll be recording it tomorrow morning (as it is still currently warm from driving).

Nah it doesn't sound like a whine, it's definitely more of a drony type noise. My main confusion is why it would disappear when blipping the accelerator? and why it only happens when cold.

I understand your confusion, I have only seen worn/loose belts do that before. They slip/squeal until you give it a rev then they grip. However that is nothing like the noise you are describing. Could it be some sort of harmonic frequency issue with something that is spinning at a specific rpm (cold start rpm). Can you recreate it when warm by holding it at cold start rpm?

[Andy_Mac]

So to clarify, when you start it it starts with the usual high (1500ish rpm) and makes the noise, then you blip the throttle and the noise stops and it settles down to the normal 7-800rpm?

 

I'd put it down to a heatshield or something else rubbing at that high idle. I know mine shakes enough more that one of the intercooler pipes would rattle but never at normal idle speed.

 

Or startup rod knock. Know nothing about it. Just something that came up in my searches a year or so back when having a similar dilema.

[Chase]

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Edited April 16, 2018 by Chase

[sobanoodle]

My bet is on a loose heat shield or some sort of an exhaust component too.

 

Get someone to listen to where the sound comes from i.e engine bay or from under the car.

[Andy_Mac]

Hmm. Guess hearing it is the only way to track it further. Might find it needs a very particular rpm to rattle. Or if its on the exhaust it heats up enough to tighten up. 

Try get it to repeat from cold if you blip the throttle then try match the high idle revs straight away. Could be something like a pulley bearing too, may need a jolt to get running right.

[Chase]

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Edited April 16, 2018 by Chase

[Chase]

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Edited April 16, 2018 by Chase

[Chase]

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Edited April 16, 2018 by Chase