Some ex-owner managed to cross-thread No.1 spark plug. Result? No thread in the cylinder head and it's losing compression past the plug. What we thought was a simple coil-pack has turned into a semi-nightmare.
Remedy? Helicoil the head in-situ if possible. Problem? Can't get a helicoil kit that goes deep enough (spark plug hole is VERY deep on an E36 M3).
This could end up in us having to take the head off. A 12hr charge for that minimum. As you can imagine I'm not a happy bunny right now.
At least I get to cruise in the E28 for a while...!