I have a 2003 z06 with 28,000 miles that i purchased this fall. i have it jacked up in the garage for the winter just going over everything getting familiar with it and how everything works. It has a vortech supercharger on it that was put on in 2004 from the receipts that i have. all done at the vette doctors in NY. It has kooks long tubes on it too. I found some burnt wires that were tight against the headers that i fixed and it fixed my active handeling codes. tonight i was going over every wire i could find and checking everything. I found a spark plug wire that was not on the spark plug???? how could this be?? wouldn't i get a code for that? I have been running on 7 cyls. scince i got it. This past fall i only put about 1500 miles on it and never noticed anything so it had to be that way. Why would i not feel a missfire?? And with that many miles on it why would someone change the plugs?? The active handeling code that was on it when i bought it had to be on there from when they put the long tubes on it in 2004? It is a rocket now with 7 cylinders going. Looking in the plug wire the part that crimps onto the end of the plug is all smashed so it wouldnt click on. the white part of the plug is all dirty so you can clearly see it wasn't on.
Could that cause any other problems?? could it have passed the dyno with 7 cyl??

 

Wow. Well it's good you are going over it now. As you wrote it sounds like the plug was not snapped over the plug end. If the wire was still close enough the spark will jump to the plug. With that said you could see burn marks inside the spark plug boot. When headers are installed, due to temperatures they normally run a cooler plug depending on headers and if tune work has been performed which I'm almost sure was done because of the PSI install. Good luck with the Z.

 

Thanks. the boot end was only on the plug past the tip so i don't know if that is enough to jump the spark. but even so with the spark longer wouldnt that register a code because it would take longer for the gap than the others. I pulled the rest of the wires and it looks like they put the wires on with a pair of pliers and squeezed the crimps on some not all but that one was pretty bad and must have just slid off.