i bought a civic with a bad motor so i swapped it out with another Y8
and it started to over heat and throw white smoke but it dosent smoke all the time
kinda weird at first i thought it was the thermostat because it didnt have leaks but i took it off and it still over heated and started throwing white smoke seems like its burning the coolant and thats why it overheats.. also wen it starts smoking the check engine light flashes!
could ive crossed the vacuum lines with the coolant lines???

 

Sounds like a blown head gasket is causing severe random misfires, as indicated by the blinking CEL.

 

but it runs good just wen the light flashes it kinda bogs and it wasn't doing this at first

 

could ive crossed the vacuum lines with the coolant lines is what im thinking?
and autozone said it was my iac valve witch i replaced but still the same problem could ive crossed the lines on the iac maibe?

 

never heard of crosing colant n vac lines. ever.

wirse on iac could be wrong. but wouldnt give the smoke. to my knowledge it sounds like hg is bad

 

Sounds like a headgasket problem,not what you want to hear but there it is.
Get a block tester and check it out.

 

yeah im sure its the head gasket and i was hoping it was something else
ordered one from honda today