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[Vitor]

My daughter tells me her car is a mess, shakes a lot, black smoke from the tail pipe, severe loss of power and flashing check engine light to boot.

I was able to isolate the problem to #2 cyl. Plugs looked clean but I installed a new set of Volvo plugs I had for my wife's 98 V70.

Problem got worse. #2 Cyl is no longer alive now. I can hear the injector clicking normally so I borrowed the ignition wires and dist. cap from my wife's 98 V70 (this happens to be my diagnostic tool)
All my problems went away.

Upon closer inspection I found a hole in the plastic insulation of the ignition wire at the point where the top of the spark plug would sit. The spark burned a hole right through the insulation.

Is this helps somebody else, you may save yourself some headache.

[Bay13]

Good find.

The cap, rotor, and wires are not called out to be replaced on any maintenance schecule. I've found that 50-60K for the cap and rotor and 100K on the wires, help to keep those weird problems that can show up from happening.