That's exactly what I was going to say. If it pools coolant in the cylinder, it'll hydrolock it. If you can borrow a ride or something, I wouldn't risk it at all.
The head gaskets on the FoRS have had some issues too, so it might be something similar to those failures. The important thing is, making sure it gets fixed before it causes a catastrophic failure.Still going to the dealership tomorrow. I topped off the expansion tank to right at the max line on Thursday, this is how it looks this afternoon, now between max and min (that wide point on the tank. With the P0316 code for misfire at startup (first 1000rpms), and this evidence to boot, a head gasket failure is likely, bummer. :(
I cannot fathom or understand what caused the failure though. My cylinder head temps never exceeded 190F with my mods, the last time they even touched 200F was before I even started modding. I'm sure there's more ways to have a head gasket fail other than heat.
head gasket does sound like a cheaper repair than a new short block.
The tech wanted to get it back to as stock as possible before going further... And I fail to see how grill shutters could possibly have anything to do with it. Grille shutters aren't gonna cause what I noticed and I had them out for a year with no issues other than a code for them being missing. My mod friendly service adviser couldn't sway him otherwise and I'm not about to buy a $300 (grill shutters are that much from Tasca) part I removed a year ago just to put back in.
Can you find another dealership ? Either that or an independent mechanic.
That's what I'll have to do, find an independent mechanic that could handle something like this; I doubt any dealer would want this. In a perfect world I'd do it myself, frankly.
