Citroën Xantia

1. Disconnect from the wire VV spark plugs (pull only for a terminal tip, and not for a wire at all).
2. Attentively study internal state of a tip, checking it for existence of the traces of development of corrosion which are usually shown in the form of a powdery raid of white color. Pull a tip on a candle, checking density of landing of the plug on a shaft of the last. In case of need again disconnect a wire and accurately turn in the plug as appropriate.
3. Carefully wipe with pure rags a wire on all its length, having removed traces of dirt and lubricant from the surface of isolation. Attentively examine a wire surface, checking it for existence of cracks, progar and other damages of isolation. Try not to bend excessively a wire in order to avoid the destruction which is taking place in it a metal conducting vein.
4. Disconnect the second end of a wire from the ignition coil (again pull only for a tip, and not for a wire at all). Check internal state of a tip and density of its landing on the coil plug. In the presence of near at hand ohmmeter check the resistive resistance of a wire, having connected the device between the candle plug of a wire and a segment in the coil. In conclusion establish a wire into place, having tracked density of landing of tips.
5. Working in a similar manner, check a condition of the remained VV of wires.
6. In case of detection of defects establish the replaceable set of wires intended for use on cars of this brand (ask in shops of automobile accessories).