182 ff very low fuel mpg.....

[stoney182]

... i have been through and read alot of other threads through the search box... but tbh still unsure it has no faults within the system and mpg has gone down from around 40mpg on the motorways to around 24mpg no matter where iam driving.... i understand that lambda sensors are problematic wich i will look into on monday .... but unsure on how a thermostat can hinder my fuel economics ( mine always sits bang on half way) its abit low on power most of the time and today i couldnt even keep up with a standard corsa vxr to any extent ( and i was trying ) i know they have more power etc but normaly can keep up quite well..
any help received is appreciated

cheers
arron

 

[Fred@BTM]

i see more failed coolant temp sensors than i do thermostats, but if the thermostat is fucked it will probably knacker the sensor as a result - in simple terms change both

if these break then the ecu thinks the engine is on cold start and dumps loads of fuel in = knackered MPG

 

[Pedro]

I may have to look at this. Im still getting dodgy counts.

 

[Damo_Sport]

are they easy to replace? both thermostats and sensors? also any idea on price of the items?

 

[stoney182]

ah rite but mine seems to sit at about half way and does warm up quite quickly so i would assume that this would be ok ......?