Lambda or thermostat?

[hipwell]

Just did a quick 10 mile cruise down m1 and reset the trip pc and it only read 37mpg, the exact same trip a couple of month ago would read 50mpg and settle down at about 45.

This is at 65mph.

Can seems to be running fine and no power loss so didn't think it'd be a lambda fault, but I changed the thermostat a few month ago with a gsf part so wouldn't have thought it'd be that either.

 

[sideways danny]

diagnostic check would pick up lambda function (not fault codes) thermostat would be easiest to check in the same way to see if the engine gets up to temperature on a run

 

[hipwell]

diagnostic check would pick up lambda function (not fault codes) thermostat would be easiest to check in the same way to see if the engine gets up to temperature on a run

I'll try and get it on a pc, aa man next door has got one. What temperature should it be reading when hot? It must get fairly warm as the cold limiter doesn't kick in when warm

 

[sideways danny]

wants to be 90-95 degrees really. The stat opens at 89 when working correctly

 

[hipwell]

wants to be 90-95 degrees really. The stat opens at 89 when working correctly

Sound.

Ever heard of dodgy gsf stats? Or they as good as Renault parts?

 

[sideways danny]

probably all made by the same company