for whats its worth, any coils that were in the engine could be marginal, unless you actually test them, you are just guessing.
Consistently you feel the need to rain on my parades! You really should check to see if "negativism" is covered under the Platinum ObamaCare plan ... either that or have a Snickers already!
On two occasions I've had LS'es that have had misfire issues. I've resolved both on those. It's been discussed on here before in great detail, that they would need to be load tested at the dealership in order to correctly determine which cylinder said marginal coil is misfiring on. I know and understand that some of you stick to the story that a marginal coil will/would not store a code, however on two occasions, I've found said marginal coil by doing an on the fly WOT load test with an OBDII code reader hooked up. On those two separate occasions both have flashed a CEL at me and managed to read the associated P03XX error.
I clearly specified that it was clear as plain day to me which coils appeared newer, however one of those did in fact give a CEL, #5 to be exact. That was one of the few coils the dealership replaced not too long ago from what I can tell. Now keeping in mind I pulled below standard plugs out which measured to be over-gaped who's to say that wasn't contributing to the cause, including the possibility of the connector not fully seated.
#4 coil was not even tested, I knew of the ETC fail safe EM interference to PCM issue and opted to simply swap that coil out with a used known to be good coil I had kicking around. It resolved the issue immediately, so no further testing or guessing as you put it was needed.
I struggled with forfeiting my Visteon coils but knew all along, this LSE was in dire need of all fresh coils and plugs. Simple as that.
Having replaced them all, I'm just
guessing, I'll save the once I did
test and keep them as known-to-be-good back up coils.
Anything else you feel the need to piss on today?