Originally Posted by
Bren37
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
Had to take it to a ford dealership who tested everything without a positive outcome, but thought it was possibly an air leak in the manifold. I think its too expensive to have it changed bearing in mind that it may not solve the problem. Already shelved out £70 for the air valve, and £80 for Ford to tell me they don't really know what the problem is.