Gen 3 coyote Mustang, engine problems overheating

[SnowFox]

In processing the marks on the cylinder walls...

Car is a 2019. Does this engine have a history of repair? Cylinder heads off? Pistons removed? Prior internal mechanical failure and damage?

I don't know what I'm looking at, the "splash" marks on the cylinder walls. I feel like the engine block has seen some prior damage. Either the original engine has been rebuilt, or this block is a donor from another vehicle.

I'm no expert but I think its just some moisture/ acid marks/blemishes that can form from unburnt fuel or moisture after the engine is shut down, or run without getting to proper operating.

Like rust on a rotor most of it should go away after the engine starts moving again.

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[mike8400]

Help what? Were you having problems before the changes?

Yeah. So we are out of the USA and the car was import, what i know the car has like 2 owners before that and used to have problems with the DI pump after that mi friend fix that and one day that give it a pull the car start with problem and that was like a year a ago

 

[mike8400]

ye

Those cylinders look kind of dry , patchy and rusted ?

how do each cylinder look on a compression test ??

are you running E85 ??

also are you sure both fans are operating correctly ??

yeah all that good compression 265, we dont run e85 that often is hard to get it here

 

[mike8400]

The CHT is a temp sensor directly on the metal of the cylinder head. The metal temp reacts to load changes much quicker than water temp. What you're seeing might be normal. I'd log ECT just to see what the PCM thinks it's doing as a result of the CHT changes.

yeah we make a log and when the CHT gets up to 255f de "coolant" in the VCM scanner is 235-240F

 

[mike8400]

In processing the marks on the cylinder walls...

Car is a 2019. Does this engine have a history of repair? Cylinder heads off? Pistons removed? Prior internal mechanical failure and damage?

I don't know what I'm looking at, the "splash" marks on the cylinder walls. I feel like the engine block has seen some prior damage. Either the original engine has been rebuilt, or this block is a donor from another vehicle.

yeah we start to think about that possibility because we don't know what the car was before import, and those marks are really weird the vertical ones and those rusty circles

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