Update! Did a leak-down compression test today, and a coolant test after I warmed up the engine. Good news is that there is no exhaust gas coming through the coolant system or through the oil pan. But there was a significant leak on cylinder 4. I could hear it, but couldn't pinpoint where the leak was going. So I did the gloves on the tailpipe trick and bingo. The gloves inflated. So next step is to remove the head. I knew I was going to have to anyway, but it's a good bit of knowledge gained.
My working theory at this point is that I have some bad exhaust valve(s) and I have leaking valve stem seals. But I'm not really convinced I have a blown head gasket. We will see....
My working theory at this point is that I have some bad exhaust valve(s) and I have leaking valve stem seals. But I'm not really convinced I have a blown head gasket. We will see....
N7turbo
2023 CX-5 2.5T ... 2024 MX-5 RF GT
It could be although that wouldn't explain the coolant loss.
Nope, I don't have an answer for that little mystery yet. Maybe the gasket was weeping a little into a cylinder. The loss wasn't fast. It would take a few hundred miles before I'd have to top up the reservoir tank. I'll just have to see when I get the head off. IF i get the head off! I made pretty good progress today, but I'm stuck on the exhaust manifold, and looking at the instructions, it looks like an absolute nightmare! I'd appreciate any suggestions anyone has.
propflux01
2024 CX5 Signature
Sounds to me like a burned valve.
