https://www.youtube.com/watch?v=xsfCmcwOMoQ

Started doing it yesterday. Sounds like a chugging steam train/panting dog/someone sawing wood.

It does it constantly at tickover speed, an increase or decrease in engine revs doesnt speed the noise up or slow it down. If you drive the car the nosie will intermittently stop and then come back again on and off. Noise stays when clutch pedal is pressed to the floor.

Car drives fine, stops and starts fine, idles fine, no misfires or performance issues, just that really irritating noise that is pretty loud.

I took it to be cleaned last night, got back to take photos and it started doing it.. sods law as i was just about to list it on eBay!

Any ideas? Whats odd is you can hear it more inside the car than from under the bonnet, but under the bonnet it seems to be coming from the inlet manifold area.