[SirMedo]

I was hoping to get some help on this issue....

I have installed an ESS Tuner about three months ago. The same day I had a Cylinder 8 Misfire. I read the code and ended up changing out the coil and the spark-plug for Cylinder 8. I did not have any issues up until about a week ago. The same code showed up, Cylinder 8 Misfire. Also...BMW had already replaced all 8 fuel injectors prior to my ESS Tuner.

I have two questions for this... Anybody had this kind of issue and any ideas what it truly could be?

Second question....I was thinking about taking it back to BMW but do I need to re-flash stock setup before the ESS Tuner or can I leave the ESS Tuner setup? Will they be able to tell that it's tuned? I don't want them to find it and void my warranty.

Thanks guys!!