Hi there,
I'm hoping someone can help me please I've got a Ford Fiesta 2011 1.25. I've had the ecu light on for a week or two and had it plugged in and came up with the coil pack failing and the car was only running on 3 cyclinders had it fixed and the car runs nice but going down the motorway and the ecu light started flashing once I went over 70mph but stopped once I slowed down blow 70mph does anyone no what this could be?
Many thanks
Rob

 

chances are a cheap coil pack mate also did you change or look at your plugs and leads ?

 

The flashing light is telling you that the engine has misfires (runs on 3 cylinders) and that it could damage your expensive catalyst.
I would take it immediately to someone who knows what he's doing.

 

Did you have the leads and plugs changed as well? We always change them all at the same time. A knackered plug lead can kill a coil.

 

Check the plugs. Seen plenty of these cracking the porcelain on the plug itself causing similar issues.