Any ideas on what can cause a coil pack to go bad? #1 seemed to be burned, removed & replaced and car running good again.

 

If something is causing the tranistor within the coil pack to stay open, it will burn up the coil pack. Do you have any kind of piggyback system controlling timing?

 

I was hoping you would jump in! Yes, I have an emanage where I'm adding fuel and reducing timing up top. The only time I use the timing map is under n2o and the problem occurred after running the car N/A while at a Z get together (Dragon Z Day in NC). I ran it hard for two days on mtn roads for what that's worth. It started missing on the way home and I then discovered my coil pack problem. I've heard the talk previous about the Greddy wiring on the timing harness might cause coil problems but this was my first mishap after a couple months of using the "emanage". Any suggestions would be greatly appreciated.

 

Honestly, it doesn't matter whether you're actually retarding your timing or not. If you have a piggyback timing controller hooked up to your system, it is in control of your timing. When not running a timing map, your timing controller simply leaves the pulse alone, but the pulse still goes through your timing controller. When you are retarding timing, timing controllers don't actually delay the start of your timing pulse, rather they extend the length of the pulse. This is just background info so you know how it actually works.

The 350Z's coil packs are pretty darn sensitive. I blew 2 coil packs within about 5 seconds after hooking up a bad timing controller, so they can't handle much extra current. If your wiring harness doesn't have diodes inline, any little glitch with the greddy can burn up the coils.

Unfortunately I don't have a fix for you, other than remove the greddy, ensure you have diodes on your wires, or install an aftermarket coil setup like MSD.

Jesse (thinks Nissan bought the cheapest coil packs possible)

 

your running an emanage, it likes to fry coil packs when its hooked up without the proper safeguards to control timing. i have seen many evos fry coils. you might want to look into this.