3rd PCV Hose Blow out. *Check Hybrid System*

Welcome to Prius Chat .

These problems can be frustrating. But don't put your Prius out to pasture yet.

Some questions:

• Is the car burning any oil?
• Has the coolant level dropped in the engine coolant?
• When the car has lost the PCV hose, have any lights on the dash been displayed?

I'm sure the answers to these questions will allow some of us to help.

Keep us posted .

 

I would check the EGR system since its affecting only the PCV valve. Remove your EGR and EGR cooler with the EGR pipe and see if its clogged up or anything, clean it all up while you're at it. Also, check your intake manifold if its dirty too. Do a complete maintenance on your Prius. Do a tune up if you haven't done so.

White smoke from tail pipe could be coolant burning as well... just answer @Raytheeagle questions.

 

Get the check engine light code and see what it say before proceeding with anything else.

 

+1 on getting the codes read. The car is telling you what is wrong.

In this case, the check engine light can be read by a cheap code reader.

From the description though, it sounds like a back pressure on the downstream side of the valve. Worth investigating what might be causing excessive pressure in the air side of the engine.

 

Could be clogging at the PCV inlet in the intake manifold? Remove intake manifold and clean? Or for starters run a pipe cleaner through it.

I'd second EGR clogging too, but not sure why that'd cause PCV hose to blow off, unless EGR's causing general clogging of the intake manifold? By your mileage EGR for sure should be checked, it's very likely to be clogged.

On the engine side of the PCV valve there's a plate on the engine wall that can be taken off, you might remove that too and see how it looks in behind. It has a baffle, acts sort of like a catch can I think.

 

With it blowing out the PCV hose there's no way that there's a restriction in the PCV. The IM is a source of vacuum. Your biggest issue is a plugged Intake manifold.

Pixel XL ?

 

Kinda surprised to see this thread go silent... I just found the same issue with my brothers GenIII at 190K miles.
His daughter was driving it on the highway and it threw the check hybrid message along with a lot of other lights.
Unfortunately I am a newbie at working on these things and even though I spent 3 days researching the possible problems here on this forum, I missed this thread. So, after doing the obvious, (new 12v battery and new plugs) I tried a little ether in the intake and when it ran I mistakenly figured the fuel pump was kaput. $450 later and no fix, I started pulling the airbox system out and noticed the PCV hose had come off the intake nipple. That was the problem and the car runs fine again. I did get as far as removing the EGR valve to intake pipe and noted it was about 20% plugged so I am assuming that there is a fair amount of slug in the whole EGR system. How that would cause intake pressure I am not sure but my opinion is that there had to have been a backfire with the throttle plate closed to create that kind of pressure. I put a worm screw hose clamp on the hose for now but after reading this thread I can see that this will happen again with the hose coming off the PCV valve end. Either way, I will start a new thread that will hopefully come up with a search for code 3190 to tell folks that they need to check for the blown off PCV hose first before any other action that might cost money for no reason.

Charlie

 

Hello, I just have the same issue on my prius 2013 that have 100000 mile. the hose was disconnected from the intake manfold. After putting it back, It came off again after 3 weeks. So, just wondering if you get any solution on your brother car. Is seems we both have same problem. Thank you

 

Realize this is a very... very old thread but it is what came up when I searched for Prius 2013 Vacuum hose issues. Had some issues with my 2013 sputtering at low speeds recently and found the computer reported code P3191. I actually had quite a few additional issues but the main problem was the hose was disconnected. Apparently this is related to a tech service bulletin T-SB-0041-15. Noticed a few posts related to this. Found a copy of the report (attached) and it reads:

Some 2010 – 2013 model year Prius and 2012 – 2013 model year Prius V vehicles may exhibit a MIL “ON” condition with Diagnostic Trouble Code(s) (DTCs) P0A0F (Engine Failed to Start), caused by Purge VSV/PCV line separation from the throttle body housing. One or more of the following DTCs may also set:
• P3190 (Poor Engine Power)
• P3191 (Engine Does NOT Start)
• P0171 (System Too Lean [Bank One])

Replace the Purge VSV (Vacuum Switching Valve Assembly) and reprogram the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) with the latest calibration to address this condition.​