After my car has been running and turned off there is a bubbling into the expansion. The head gasket looks fine, Compression were all 155 psi and one near 180. Not sure what is the cause. Anyone have experience with this?
going to need more info. have you changed the coolant recently? does it lose much coolant? has the engine overheated at all? 180 seems a bit high when the other 5 are only 155. pull that plug out and check the piston crown with a small torch. if it is spotless clean, that's not a good sign