My 1997 1.25 zetec fiesta failed its MOT on emmissions.
All 3 readings were sky high!
I renewed the plugs, air filter, fuel filter, changed the oil and filter, filled the tank with fresh fuel and a dose of injector cleaner and drove it for 100 miles (mostly motorway).
On retest only the CO test is failing (just out).
I am now checking for air leaks and noticed that when I 'blip' the throttle there is a definite 'sucking' sound from around the manifold. Is this normal? If not is there anyway to check for leaks without taking the manifold off?
Any other suggestions of what the problem may be?
Any help would be most welcome!
Thanks...Andy