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So I decided to order a new head gasket as I couldn’t see the issue being caused by anything else and low and behold my head gasket was cracked on one of the layers between cylinder 8 and the coolant jacket. Had the head machined by a shop and put it all back together and now she starts and...

PM’d!

Yeah fans were running loud and proud. Ran it with the rad cap off to work out possible air trapped in the system and added roughly 4L of coolant/water mixture. I did the thermostat about a month ago so if it burnt 4L in a month I would’ve seen signs of it coming out of the tail pipes so I’m...

I’m hoping the overheating is being caused by air in the system because it wasn’t filled up entirely when I did the thermostat so I’m going to try topping it back off now and see if that does the trick.

Yup! Plugs are all gapped properly. I’m going to be pulling the plugs on 8 today and checking/swapping. Maybe I dropped one and made a hairline crack in it or something. I’m kind of running out of ideas now.

First time poster but I need some help. 2012 6.2L N/A with 122,000km. I’ve had the truck for nearly 2 years now and up until 6-8 months ago it was a dream come true. As of lately though I’ve been chasing a cylinder 8 misfire (P0308) and misfire at startup (P0316), and on top of that I’ve had...