Hello All,

I recently bought a 2002 ford focus flight

It has a slight miss fire under 1K revs, changed plugs and air filter so has anyone got any idea of what this could be?

Plus my heaters only work on number 4 settings, no idea why this is so any information would be good on this?!

Thanks

Remove the spark plug leads and look to see if any water has gathered in around the spark plugs.

Seems to be a common issue with the Focus.

If there is try remove the water with a syringe of some sort and possibly use a blow dryer to dry up any remaining fluid.

Seems to happen my girlfriends Focus every few months and is always the issue for it misfiring

Not sure about the heater problem unfortunately

Thanks for your reply, ill have to have a look at this tomorrow when it's light and sort it out as it's getting on my nerves now!

What's the coolant level looking like? and were the old plugs all about the same condition/colour when you changed them?

The heater issue is due to the resistor pack failing. Another focus issue lol. If the drying up around the plugs does not sort it out its most likely the coil pack is duff...

Might also be worth removing the spark plug leads form the spark plugs and coil pack and shake them seeing if any condensation or moisture comes out of then, another common thing with the Focus

Coil pack.

Heater resistor pack, ford still cant manage to make resistor pack that lasts, new fiesta has same Issues.

Misfire at idle can be as simple as plug gaps check they are 1.0mm then get some dielectric grease and apply this to each spark plug lead both ends usually this cures the slight miss