Head Gasket Replacement on Gen 3 prius

To the best of my knowledge it’s coming from exhaust manifold. Marked it out in the picture.

The coolant levels went slightly below low, but holding there.

the last time I turned it on, the knocking seems to have improved. Should I drive it around for a mile or so?
Too bad mechanics are closed due to long weekend.

edit: oh, no white smoke from the exhaust pipe in the back. Smoke from behind engine is burning smell, not sweet. The exhaust manifold is getting pretty hot within minutes. I did spill a lot of coolant onto the cover under engine due to thermostat housing leak and some fuel while removing the fuel line (weeks ago).

 

Wish I could.

So I turned on the engine again, to capture where the smoke is coming from, and noticed it’s gradually decreasing. Definitely not as bad as last night. Knocking and vibration went away and left the car running for a good 5 mins. No major smoke unlike last night and first time today. I did notice something leaking (here’s the video) check at 0:46 mark. There a kind of hose right below the passenger footrest panel. Don’t know if that should be connected (did not go near that area).

Now noticed the coolant leaking from the front right side (driver side). Hoping I simply forgot to tighten the coolant valve. Coolant level has dropped completely again. Coolant leak video

Below are more videos from last night
Video 1
Video 2

 

thank you for pushing me.
The smoke is almost all gone. The coolant was leaking because I didn’t tighten up the valve.

coolant levels are holding. Engine doesn’t seem to rattle at all. There’s still check engine light on, but maybe it’ll go away once I clear the codes?

video after topping off coolant again

time to take it for a drive.

 

Update:

i think it’s done! Drove around 30 miles and no rattling!

The handling seems stiff though. Or maybe its because I haven’t driven it in a while. Will do more research on that.

For now I think it’s done. Thanks to @Mendel Leisk @ASRDogman @rjparker

Edit: Also thanks to @ttou68 @Tombukt2 @bisco @ChapmanF and everyone else who helped! Sorry if I missed anyone.

 

Haha! I'm being cautiously optimistic...

 

Sadly I got a check engine light back on. Felt the acceleration was sluggish and mpg dropped slightly (from 48 to 45mpg).. Went to autozone to get the codes. The issue seems to be in the Power Train System

Code: P0016 IN. DVVT System Phase Difference/Range Malfunction. Crankshaft Position - Camshaft Position Correlation - Bank 1 Sensor A

Most Likely Solution: Replace Variable Camshaft Timing (VCT) Solenoid.

I've looked up for solutions and came across this video. But that seems to be about variable valve timing solenoid.
Most articles and solutions seems to be about VVT too. Couldn't find aby info on VCT. Can anyone point me in the right direction please?

Edit: Let me know if this should be it's own post. Thanks!

 

below post of mine has the picture of the camshafts and harmonic balancer. (The pictures were taken at the same time).

After that it was valve cover installation and other components.

Would the cam timing go off after starting the engine from that point?

I’ll check the ground bolts tomorrow, I didn’t clean them or anything, just draped it over and bolted them.

the solenoid wiring is the long trail that goes around the valve cover right? I’ll check that too (although I’m confident I got it right).

 

Understood. There is a possibility the chain could've jumped a tooth, I did reuse the old chain. I can distinctly remember timing chain installation as I took time to get it right. It did feel like it was slacking a bit, but after timing cover and tensioner installation, it was snug; and I did rotate the crank about 8 to 9 times and didn't notice any slacking.
Again, it might've jumped a tooth, but verifying cam positions would mean a far bigger job/fix for me. So I would like to give smaller jobs a try and see if that fixes the issue.

Also, I was under the impression chain jumping the tooth isn't an issue as long as all the crankshaft and cam marks are aligned?

Couldn't find an issue with the ground bolts or the Solenoid wiring. Although the wiring was out in the open for about 1.5 months while I was working on it. Maybe some dust got in there? Is that a possibility? If so, any tips on how to clean the sensors?

Edit: Found a video that details how to check if it is the faulty solenoid. Link to video
Is that a good place to start? Is VVT the same as VCT in this case? Because that threw me off and confused me big time.

 

Update:
Got around to removing the valve cover to check the marks for cams and harmonic balancer. (Link to video)

it looks right to me, the cam marks are where they should be corresponding to the harmonic balancer. Am I missing something related to the P0016 code?

Edit: Rotated the crankshaft until the links lined up too, which they did (link to video).

Any ideas on what else might be the issue?