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Cold start noise

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Old Aug 22nd, 2018, 16:17   #1
PNM
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Last Online: Today 16:29
Join Date: Jun 2018
Location: Midlands
Default Cold start noise

My 2.0l Petrol S40 (56k miles) makes a rattling noise when it is first stated after being left standing for 12 hours or so. It only lasts a couple of seconds. It's doesn't appear to be related to the outside temperature or humidity, and is not affected by having the AC on. I've changed the belts and tensioner which has made no difference. I can't see anything that is loose that could account for it.

I recently left it at the airport for a week and the noise was even worse when I started it - louder and lasted a little longer.

It has a full service history, and the oil is exactly on the max mark of the dipstick. Drives fine, no warning lights, good MPG etc.

Has anyone got any ideas what it could be. It's been difficult to locate where the noise is coming from, as by the time I've started it and got my head under bonnet, it has stopped!
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