BbOi0420

***Edit -- SOLUTION IN SECOND POST

Summary in list form:


SITUATION:
-Swapped obd2a engine into obd2b car.
-Used new engine harness and ecu. Not NEW, but you know what I mean.
-Runs weird and am afraid it's the ecu or engine harness that has somehow caused damage to engine.

SYMPTOMS:
-After it warms up and idle comes down, it starts to rise again. Especially after driving it. Idle continues to rise and eventually went up to over 3k.
-A lot of white smoke from exhaust, tons of white smoke. Does not smell sweet at all.
-Temperature went up just slightly
-Radiator seems to be under pressure. There was a little bit of coolant splattered on intake. However, it wasnt completely full. After I topped it off, it didnt do the splatter thing again.
-No check engine light.
-Engine has never overheated since I've owned it.

Ok, so that's the issue. When I noticed the car had extremely high idle, I drove it the couple blocks back home and turned it off. I made sure coolant was topped off, started it again after a couple hours, same thing happened, only this time it went from cold to operating temp after about 45 seconds.

Please advise!!

Thanks

BbOi0420

So after close to 200 view and no replies, as well as me freaking out that my engine had blown it's headgasket, I figured out the problem...

-The "white smoke" was just warm exhaust going into the cold air.
-The temp/coolant issue was just low coolant.
-The idle issue was just a sticky throttlebody, kinked/dirty cable, and dirty iacv.

All has been cleaned and car now runs/idles like a champ.

Hope this helps someone else in the future!