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.

 

I have ct200h 2012 with 168k miles. I had egr valve and egr cooler clogged. after cleaning (which is a pain in b... )(it took me 8 hrs, and I did it once 3 years ago) I put together everything. started the car it got me p3190 with check hybrid system error on dahsboard. engine was so weak and would run more than 10-30 seconds. the issue was the same. I forgot to connect the pcv hose to pcv vavle. (other end on theotle body was connected)

by the way, I washed the intake manifold, also added bluedevil to tix my head gasket leak on cylander 4.
original issue was rough engine when starting cold. I noticed my coolant level was so low, also knew that my car is burining too much oil. so decided to do both egr system cleaning and use blue devil to fix the head gasket leak.
I did :
1- (egr pipe+ intake manifold+ egr valve+ egr cooler) I also cleaned pcv valve and made sure it runs smooth.
2-
drained the radiator and added new clean water with half qt bluedevil, and kept engine on maintenance mode for 50 minutes.

now I have to wait for the engine too cool down, then reflush the bluedevil remainings and this time add 50/50 coolant.
I guess it needs about 1.5 gallons.

 

Between introducing water to the system, and a massive amount of “sealer”, you’ve only compounded your problems.

 

Wow! Lucky you! Now not only do you have to replace the leaking head gasket,
you have to replace the radiator, heater core, water pump, thermostadt, likely smaller hoses....
Because EVERYTHING will clog, except for the head gasket.
Since you are burning (a lot?) oil, your best bet would be a remanufactured engine....

Running straight water, is a very bad idea because it will turn to steam, and evaporate, and NOT cool the engine.

The engine was NOT running, it was being turned by the hybrid battery. It sounds completely different.

NO head gasket so called "sealer" works on sealing a bad head gasket.

 

Hmm, I just noticed this was a six-year-old thread where the PCV hose "came" off, and it doesn't look like anybody ever mentioned the TSB about that.

The OP had the right question. For Prius and Prius v up through the 2013 model year, the TSB identifies an updated firmware version to be flashed to avoid the backfiring. Some have done it preemptively, as having the hose blow off while driving and the car die can be inconvenient, and the pressure can damage the purge valve and require replacement.

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