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Misfire with fault code

  pb ph2 172
3024Injection valve cylinder two
Open circuit / short circuit
also I've removed the plugs and cylinder 2's plug is black
  Clio 182
I had similar to this on my 1.2 turned out was the injector
mine was intermittent at first then it was constant
  pb ph2 172
Changed all four injectors to ones from a 182
still miss firing so I e changed plugs coil pack etc to no avail
only thing that's changed is now all 4 plugs get covered with black soot
and black smoke comes out of the exhaust