anybody

You don`t say what model car it is and the year would help - but here are a few pointers - one of the most common faults on the later models is the coil pack breaking down - causing a missfire - also check the sparkplug's and leads on number 3 & 4 cylinders for signs of tracking

- a silicon bases grease is applied in the plug leads on every change of the sparkplug's to stop this problem ! if you let me know the model of car and the year i may be able to help further as there are a number of other faults it could be !

Mike D.

Sorry its a Mondeo 16v on a p plate he replaced all the h.t. leads.and plugs.he said it miss firers when he trys and rev it up.the M.O.T place told him it was the air sensor in the exhaust, which i replaced for him today but it still misses,

Engine size or all all 16V Zetecs the same? Try uk.rec.cars.maintenance as you may find more people there with an interest in Fords.

I know it has just had plugs and leads but check them again - usually

3 & 4 for any black lines up the ceramic & also inside the leads - without silicon grease they don`t last very long as there is about 60,000 volts produced by these coil packs - also check the T piece >> You don`t say what model car it is and the year would help - but here

Thanks for the replys.Well Mike i will try this for him after he has taken it for its M.O.T again,