I'm going to back up to first having problems. About 6 months ago, I drove through a Texas thunderstorm with "torrential" rain. It was bad enough that water was getting on top of my motor even though I was traveling at 85+ mph. My grandson needed me. I am his bestest GRANDMA (Oma). I am mechanically inclined, can rebuild most motors inside of 6 hours with all the parts at my side! Anyway, after this day, I started having numerous problems and was fixing them as they appeared. So, when my OBD II reader showed 3 misfires along with other problems, I fixed all the quick ones and left the misfires for a short time, I changed the front four plugs and was down to 2 misfires #4 & #7 I ordered a complete set of COP's because I had found on the plug change that my COP's in the back were coming apart, literally! When the packs came in, I replaced all 8 plugs, checked the connector gaskets, added dielectric grease to them, I replaced all 8 COP's and reassembled the vents and all the wires, hoses and crap under the hood that makes working on them a PITA! I test drove while running the OBD II coder and received #7 misfire. I believed it may just be build up in the cylinder so I drove it hard for a week. You know like a man, because I have a lead foot! The following weekend, I swapped the coil pack with the one beside it. Misfire stayed on #7. My connectors are tight, no water, no bad COP's, Motorcraft Plugs, just can't get rid of this stupid misfire and my inspection is now past due! So, I will be trying the noid light after my husband brings my car back tonight. He took it to work to test the wiring harness because my meter is missing.
Anything else you may think of...I'm checking aside from asking or stating things that may imply my lack of knowledge like where #7 is located!
PS The bad COP's #7 & #8 the connector (the end that looks like a plug wire, in case you don't think I would know) separated, the spring was stretched and broken on one, and the other was attached to the plug and stretched. Both boots came off the hard plastic body in pieces. I think #7 was dead before the storm and it just didn't throw a code until after. If so, would carbon build up take this long to clean up?
