PCV hose at intake came off, caused code P3190

This seems like it's going to be an ongoing problem, hoses don't just blow off, something's up.

Yes. At least, I'd think something is causing pressure, in the intake manifold. Isn't the normal condition partial vacuum?

 

And at full throttle at the most it approaches normal air pressure, never really goes positive. Normally.

Could the pressure be coming from the crankcase side?? I was watching a video the other day, someone running a VW of some ilk (turbocharged I think) on a dyno, revved up and up, and managed to blow the dipstick out. The hood was up, so it was quite entertaining, lol.

 

@danlatu (resident Oil Catch Can advocate and engine rebuilder) mentioned the other day that the hoses between PCV valve and intake manifold are typically, perhaps invariably, in partially vacuum condition. The question was whether hose clamps were needed, and the consensus was that they weren't, due to the typical vacuum condition, and there was actually more danger of hose collapse.

But you're having the opposite condition: pressure, enough to blow the hose off.

 

The hose from the pcv valve to intake manifold do have a spring clamps. I reused the 1/2 size when installing my occ. If you have a vacuum leak, you will throw a code. The prius is sensitive, I had a cps (camshaft position sensor) not fully seated and car shut off on me 5 miles away from home. Threw a bunch of codes. It looked as if it was plugged in all the way, unplugged it and plugged it back in. Cleared the codes with my obd reader (luckily it was in the car) and car has been running fine since.

 

Pressure in the PCB lines should be near that in the intake manifold, which is normally never above atmospheric in a normally aspirated engine. It would be higher with turbocharging or supercharging, or in case of a backfire.