Over last few weeks have noticed on occasion (not every time) from cold start at idle I can hear a fairly loud mechanical clicking from the top of the engine bay. The clicking last about 30 seconds or so and remains constant tempo of about twice per second. With the bonnet down its as if its coming out of the front grille.

Gentle increase of revs seems to stop the ticking and I get no repeat until the next cold start but as I say it doesn't happen every cold start.

I've found vanos rattle on the forum and the youtube links seem to show quite a rapid rattle whereas I have a more rhythmic slower ticking.

Anything synonymous with a 4.4 TDV8?

Many thanks  405 AB exec seats Baltic and Cirrus
93 RR Classic efi

Remember it's easier to get forgiveness than permission!

Gone in order:
4.4 TDV8 SE - gone to a good home
93 Classic hard dash Plymouth Blue
03 L322 Oslo Blue
2000 Disco TD5 ES Epsom Green
98 P38 Rioja Red
89 Classic Cairngorm Brown

Sounds if it could be belt, idler or pulley related? There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2010 LR D4 Commercial 2.7 TDV6

Thanks NMJ but with belts, pulleys etc would the ticking be audible all of the time and change tempo with revs (or at least return when the engine gets back to idle after a journey)?  405 AB exec seats Baltic and Cirrus
93 RR Classic efi

Remember it's easier to get forgiveness than permission!

Gone in order:
4.4 TDV8 SE - gone to a good home
93 Classic hard dash Plymouth Blue
03 L322 Oslo Blue
2000 Disco TD5 ES Epsom Green
98 P38 Rioja Red
89 Classic Cairngorm Brown

Vanos rattle is on the petrol 4.4 V8 yours hasn't got one so it's not that... can't really help with what it is though... sorry Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I would tend to agree with you, but a rhythmic ticking sounds rotational so it's probably a good place to start. My top idler pulley had a failed bearing in it, with the engine off and a bit of wriggling you can get a hand on it and see if it has any play in it. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2010 LR D4 Commercial 2.7 TDV6

Thanks both - I'll do a bit of digging.

Cheers 405 AB exec seats Baltic and Cirrus
93 RR Classic efi

Remember it's easier to get forgiveness than permission!

Gone in order:
4.4 TDV8 SE - gone to a good home
93 Classic hard dash Plymouth Blue
03 L322 Oslo Blue
2000 Disco TD5 ES Epsom Green
98 P38 Rioja Red
89 Classic Cairngorm Brown

Top idler pulley’s are a problem on the 4.4 TDV8... Do a few of them