My 2013 XC . 60 t6 130k miles got a misfire and flashing check engine and reduce speed upshift message on the Pa turnpike, ugh, on Saturday. About 180 miles from home. It was pretty much not drivable. Towed to a local mechanic that did coil packs , AutoZone brand, and plugs, I'd never changed the packs before. It didn't help. Got a cylinder 4 misfire. Swapped the coil and plug and they're good. The plug was soaked with fuel. I got a ride home. This morning he checked compression. 75 in that cylinder. Others ok. When he took engine cover off there was a pcv hose that
Had come off. I had heard pinging couple weeks ago and got check engine but switched to 93 octane then pinging seemed better and check engine went out. I'm thinking I've been leaning out and thinking burnt valve. Any thing else I should check. Would a wide open injector maybe cause these symptoms? It's a really nice car, friend can't believe it's 12 years old, that I've had for 5 years but a valve job means I'll probably sell it for parts. Thanks for any help or advice.
I've also posted this to the engine forum but maybe someone here has had a similar problem.