Originally Posted by Drshovelhead
Not sure if it is the same cylinder..
Used new boots when changed the COP with dielectric grease...according to this forum
COP only have 12k on them.
Is there a way to tell if you have a bad COP? I have read that you move them around and track the misfire to the cylinder, but if it is not throwing a code, how do you know.
Pending codes are usually stored - it's only when a threshold is reached that a CEL is set. You need an advanced scanner that can access pending codes.
Moving COPs is the usual method, once a reliable indicator is present ( either hard failure or a device capable of retrieving stored pending codes ).
End-user diagnosis of a COP itself is limited to resistance measurements, but that is inconclusive, as they usually fail under load.
Sadly - some folks have had to resort to shotgunning all eight with a new set of MC's or Visteons.