CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
So on our trip, really bad milage dmax
- Thread starter blazinzuk
- Start date
When are you stopping by? We might drop down and meet up on the Chicago side of the lake, if you're still game.
How has the truck been these last few days?
Sounds good!
Safe travels!
What happened on the way home? Was it better?
Sounds like it wasn't. 
Nope, I checked every time for milage, started using my god for dead accurate miles. Got mid nines mostly on the way home.
Then after we got home and unloaded everything cleaned out the fifth wheel and sent my mother in law on her way to her house, well real problems then.
I will very soon be tearing into a lb7 to replace head gaskets. Gonna do injectors too.
So got home Saturday morning. Got her call and took off to borrow a truck and get her truck to my house and her fifth wheel to her house.
So did you confirm it was eating coolant? I know you said the coolant overflow was black.
I haven't investigated any further.
I'm taking today off of life.
My head hurts
Pic of the coolant reservoir
I'm taking today off of life.
My head hurts
Pic of the coolant reservoir
Make sure you do something about the injector cups while your at it. Gotta love it when shit hits the fan!
So it had many more issues than external fixes. That sucks.
I'm not sure about the LB7 engines but on the LLY when you pop a head gasket they tend to push coolant out of the overflow. Instead of sucking it into the engine the combustion pushes exhaust gasses into the cooling system. Mine did just that when I lifted lifted the heads.
That picture could be just massive amounts of raw diesel not being burned, due to bad injectors. Look at resealing replacing the cups when you do the injectors, reset the valves while your there too.
That picture could be just massive amounts of raw diesel not being burned, due to bad injectors. Look at resealing replacing the cups when you do the injectors, reset the valves while your there too.
Will the raw diesel burn white?
Yes it does. With a slight blue tinge to it
Why would the coolant be black?
I'm gonna have to do some investigating soon.
I'm gonna have to do some investigating soon.
My -1gen duramax gets 25mpg.. Toes light a freight train too.. Goes as fast too..
Surge tanks turn black when you are getting combustion gasses in the cooling system. 6.0L powerstrokes do it all the time. I have one at work currently that has an almost brand new surge tank that's totally black inside. It most likely has cracked cyl heads. I would venture to guess that your Dmax either has bad injector cups letting combustion in the cooling system or a cracked head(not sure how common that is on Dmax) or possibly just a bad egr cooler(Don't know much about those either on a Dmax). Napa sells a combustion gas test kit that uses a blue fluid that turns green with combustion gasses to test the cooling system. I've had really good luck with it.
And does it in the desert going 125mph
With the A/C running...
