FORD FOCUS 1.6 Zetec 02 - hi idle problem
My FORD FOCUS 1.6 Zetec 02 has failed the MOT because a hi idle test could not be carried out for emissions. Over 2,000 revs it starts to jump around, then will shoot to 3,000 revs. I have changed the engine management air valve but this has made no difference. The diagnostics are not registering a fault, anyone got a clue what this could be? Thanks