PCV question

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TIA,

The gases, vapors, etc that go thru the PCV valve line go where to get burnt? Do they pass through the fuel injectors to enter the combustion chamber? A buddy asked and got me scratching my head.
 
Thanks man. That means they don't go thru the injectors? I would imagine they get fouled up, which was my feeling.
 
Like SimpleG said, They go into the intake airstream and gum THAT up, instead
wink.gif
The intake resonance/reversion pulses can get gunk around the throttle/throttle body and you'll start having off idle response issue and idle control issues over time, in some engines.
 
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If you do good OCI's and maintain your oil your PCV valve will be in good condition. Factory AcDelco PCV was good at 100k so I replaced it with a NAPA one.
 
Originally Posted By: ARCOgraphite
Like SimpleG said, They go into the intake airstream and gum THAT up, instead
wink.gif
The intake resonance/reversion pulses can get gunk around the throttle/throttle body and you'll start having off idle response issue and idle control issues over time, in some engines.


Thanks for the replies, any way to clean that up assuming it happens?
 
The PCV gasses don't actually go through the injectors.
They go on them and around them. They leave a black gunk/soup in the intake manifold after a while, and deposits on the intake valves, the outsides of the injectors, throttle body bore and plate, and the ports where the intake charge flows. Then, it enters the combustion chamber to get 're burned'. Since it is not fuel, it doesn't burn completely or very well. More deposits are then formed inside.
This is why I use a PCV catch can.
 
The PCV gasses don't actually go through the injectors.
They go on them and around them. They leave a black gunk/soup in the intake manifold after a while, and deposits on the intake valves, the outsides of the injectors, throttle body bore and plate, and the ports where the intake charge flows. Then, it enters the combustion chamber to get 're burned'. Since it is not fuel, it doesn't burn completely or very well. More deposits are then formed inside.
This is why I use a PCV catch can.

BTW, older cars with carburetros washed the PCV stuff out of the manifold and valves to a great degree. Things are actually worse with fuel injection, deposit wise.
 
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How would removing the IAC on a Ford engine and spraying something like power foam in there work for cleaning that area out? Leaving it in for lets say a long soak?

Would something like MMO being fed via an Inverse oiler drawn thru the PCV hose keep it clean?
 
Remove the intake and tank it - if its nylon??? I would do nothing that would flush copious effluent down into the piston/combustion area.

aside: Why would and educated oil guy/gal put MMO in the engine? Paint Thinner and light Naphtha oils + it has chlorinated compounds up to 1%. (p-dichlorobenzene). Sounds like 1963 all over again!
 
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With the intake manifold deposits, either clean them completely or leave them alone. MAnual cleaning is best. You don't want a sudden and massive amount of gunk going into the combustion chambers.
NOrmally, these black gooey intake deposits just kinda sits there and are pretty harmless, unless extreme amounts are there.

But cleaning the TB and idle valve is great.
 
Originally Posted By: ARCOgraphite
Remove the intake and tank it - if its nylon??? I would do nothing that would flush copious effluent down into the piston/combustion area.

aside: Why would and educated oil guy/gal put MMO in the engine? Paint Thinner and light Naphtha oils + it has chlorinated compounds up to 1%. (p-dichlorobenzene). Sounds like 1963 all over again!


Educated people use things that have worked for them. My immediate family has been using MMO for well over 30 years, my father and uncle were mechanics and have seen the benefits of MMO and continue to use it. If it works run with it. Water has been around since the beginning of time, and if properly introduced into a combustion chamber does a fantastic job of removing carbon.

I'm still learning, but I know one thing if you find something that works stick with it. JMO
 
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