You would be the first we've heard of. Warranty...probably wouldn't void anything, but not sure this (a replacement head) would be covered under powertrain either.Will that cause a warranty to void? Is this normal after 55,000 miles has anyone else experience this?
Only when cranking. It's probably 10-15 times that during combustion.The threads hold them in place. You've got probably 170 PSI on the other side of that plug - if it's loose or misthreaded into the soft aluminum head, the coil pack isn't going to do a thing to hold it in.