Basically, open loop is where the engine runs solely from the ECU map, when the loop closes the engine measures the mixture from the lambda sensors and adjusts the fuel accordingly, trimming the fuel map...

When cold it stays in open loop to be able to richen the mixture (old style choke)

This control is usually switched by the temp of the water in the engine so if you lower it too far the engine will never close the loop... I couldn't find any reference to the temp at which this happens on a fatty but as usual if you modify something you have to consider the ramifications...

I hope that makes sense....  Pete

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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-

thanks, yes it makes sense
sort of hahaha RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar

So, replaced the leaking hose and expansion tank cap today. Flushed the system and renewed coolant. Then did 100+ Km on the new air struts.
No leaks whatsoever.
Literally looking for excuses to drive the fatty as much as possible right now
I'm over the moon!

 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-

vs322 wrote:

So,
Literally looking for excuses to drive the fatty as much as possible right now
I'm over the moon!