Consider the joint operation of a control valve and a manual balancing valve in a traditional coil pack
The coil pack
is an essential part of a petrol engine's ignition system and even a minor problem, made more likely by the cold temperatures found in winter, demands a visit to a trained car mechanic - who is likely to charge a minimum of pounds 200.
The AA discovered all four spark plugs and the two coil packs
were loose, so whoever had fitted the plugs had not used enough torque.
It also includes a number of mounting holes for rails and coil packs
Computer-driven coil packs
replaced the points, condenser and distributor in most vehicles a long time ago.