Ford Mondeo 1.8

[brads1973]

hi i new to this but please help as pulling my hair out............ mondy 52 plate 1.8 engine starts ok on key idles ok as soon as you put on the headlights there is a power drainage and the engine runs on three pistons only but when you take the headlights off the engine returns to 4 pistons this is now becoming a headache please help thank you

[mintalkin]

sounds like a faulty coil pack as when the lights are on the extra drain on the voltage will sup the faulty pack.

[brads1973]

hi mate if it was a faulty coil pack would it not be like that all the time through every gear and do it on initial start up.......as it also hesitates has a miny fit thru 1st and 2nd gear ie missfire when the lights are off in the day time

[brads1973]

just realised that you could be rite as wen engine gets to optimum temp the speedo drops to nuffin and then the missfires start ie wen engine gets warm coil pak plays up will keep u posted wen change pak