the wifes focus is being a guttsy hog. struggle to get 90-100 miles to £20 of fuel. she drives it pretty normal as she has the kids in the car,

its got a k&n panel filter a resinator removed from the airbox. when she is driving you dont hear the intake grunt

no trouble codes

any ideas?

 

Has it lost power, is it able to climb above 4/5k revs?

 

Unplug the air flow meter then take it for a drive. This will bring the engine management light on but see if it improves. To turn the light off again disconnect the neg lead off the battery for half an hour.

 

i get 80 miles roughly for a tenner with an inductuion kit on on my 1600se and thats with todays petrol prices and i can my car roar,its not shy

 

All you need to do clear the ecu is pull the violet 2 map fuse marked KAM, for a few minutes.
I would look at emissions for a clue first.
tabetha

 

it just got mot'd at the start of the month and passed the emissions no bother, but in fairness its got worse since then.

her last focus was a 1.8, similar fault with no codes, i ended up replacing lambda sensor, afm, and idle valve, it did have sticky revs tho and a lot more miles on it.

ill get it into the garage and get the emissions checked again