Coil Pack and HT Lead Misfire
ModerateElectrics & ElectronicsLater small-capacity Zetec-SE petrols commonly develop misfires from tired coil packs, leads or plugs, especially after damp weather or deferred servicing.
Jerky acceleration, Misfire under load, Lumpy idle or poor cold running
- Drive the car under load in higher gears
- Look for recent ignition-component invoices
- Avoid cars with obvious aftermarket ignition bodges