PCV delete? yes or no

ronstang94 · Mar 6, 2008

Oil comes up my pcv into my intake manifold and keeps fowling my rear two plugs making the car run rough . i dont want to put an oil seperator in, but if it was the only choice i would. Can i just cap off everything on the cai and intake manifold, and put breathers on the oil fill tube and pcv valve? any reasons y this is a bad idea?

Thanks

GTA_V6_Mustang · Mar 7, 2008

ronstang94 said:
Oil comes up my pcv into my intake manifold and keeps fowling my rear two plugs making the car run rough . i dont want to put an oil seperator in, but if it was the only choice i would. Can i just cap off everything on the cai and intake manifold, and put breathers on the oil fill tube and pcv valve? any reasons y this is a bad idea?

Thanks

Well that is not something that You usually do unless you are forced induction to avoid boosting the crankcase. The PCV activaly scavenges HC emissions (which you already paid for) and H2 together (aka blow-by gases) from the crank case to protect your oil from contamination and sludging. When you have a breather it works passivaly. The pressure in the crankcase itself pushes w/e wants to come out, out and into the atmosphere (a no no for emissions). You may want to try replacing the little mesh screen under the PCV valve to see if that helps as that is its purpose to keep oil from going into the PCV system. Advance has it for a cuple bucks classified as crankcase breather in their computers. You can go about taking it out with a magnet if your lucky and its strong enough. Or what some guys here do (including myself) Take a concrete screw and jam it threw it and screw it into it a bit and jank that itch out. I believe in the PCV system because its taking that gas I already paid for from the crank case and making sure it goes back into my engine, lol Hope this helps at all.

ronstang94 · Mar 7, 2008

GTA_V6_Mustang said:
Well that is not something that You usually do unless you are forced induction to avoid boosting the crankcase. The PCV activaly scavenges HC emissions (which you already paid for) and H2 together (aka blow-by gases) from the crank case to protect your oil from contamination and sludging. When you have a breather it works passivaly. The pressure in the crankcase itself pushes w/e wants to come out, out and into the atmosphere (a no no for emissions). You may want to try replacing the little mesh screen under the PCV valve to see if that helps as that is its purpose to keep oil from going into the PCV system. Advance has it for a cuple bucks classified as crankcase breather in their computers. You can go about taking it out with a magnet if your lucky and its strong enough. Or what some guys here do (including myself) Take a concrete screw and jam it threw it and screw it into it a bit and jank that itch out. I believe in the PCV system because its taking that gas I already paid for from the crank case and making sure it goes back into my engine, lol Hope this helps at all.

Good info. thank you. these terms are a little new to me. HC (hydrocarbons) is unburnt fuel that got pushed past the piston rings and what exactly is H2? H2 also was pushed past the piston rings? all engines have blowby? or just older engines with worn rings? I need to replace that metal screen, i tried pulling it out with needle nose pliers, ill try the concrete screw. thx again

greenlantern · Mar 9, 2008

I wouldn't block off the pcv, you need that vacume from the intake to help keep the crank case ventilated. The oil you getting is the result of blowby, your correct your rings are getting worn so you getting more pressure in your crank case as a result. My advice is to add a catch can between the pcv and the intake. The catch can will capture the oil and keep it out of the intake. They work very well. You can buy them or make you own. I made one out of some pcv fittings and a little steel wool.

GTA_V6_Mustang · Mar 14, 2008

ronstang94 said:
Good info. thank you. these terms are a little new to me. HC (hydrocarbons) is unburnt fuel that got pushed past the piston rings and what exactly is H2? H2 also was pushed past the piston rings? all engines have blowby? or just older engines with worn rings? I need to replace that metal screen, i tried pulling it out with needle nose pliers, ill try the concrete screw. thx again

Hehe, sorry been on vacation but I am back to answer now. I meant H2o lol my bad I was in a rush when I wrote that. Normal byproducts of combustion are NOx (Oxides of Nitrogen), H2o (water), HC (which is gasoline in its vapor state), Co ( carbon monoxide), Co2 (Carbon Dioxide). When anything of the combustion chamber gasses get by ur rings its called blow-by which is all of the gasses. But the main focus is on the HC and H2o Because that is what causes sludge and contamination of engine oil. Hope that helps.

Answer to you question about only old cars getting blow by. No All cars get some amount of blow-by. No engine designed is perfect. You normally check this with whats called a cylinder leak down test. Normally 15% blow by is the norm and is acceptable. However as our cars get older and gain more mileage you start to see that percentage go up due to worn rings, or cylinder walls (typically rings in later model vehicles, used to be walls in older vehicles due to extremely hard rings "anyone remember the ridge reamer?, lol ). Umm I dont know if I am missing anything or not but If you have anymore questions just let me know. I can go on and on all day about this chit.

BlackVert · Mar 14, 2008

no, don't delete the pcv

PCV delete? yes or no

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