Probably one of the best explanations in RUclips mentioning why PCV always has to be used with a breather tube, that clears most of my doubts. Great video brother!
The part where he mentioned how the pressure from the Crankcase travels through the Oil Way Tubes (that normally run from the Valve Head section down back to the Crankcase base/Reservoir to get resent back to the Oil Pan) up into the Valve Head section is what did it for me. Never understood what a PCV is doing on top of the engine head if the Crankcase is down below.
Great video. Explained well. I like the fact that you explain with the diagrams and then show a real example. Very clear and understandable. Keep up the good work.
The PCV is one of those little marvels of universally adopted engineering. The simple appearance belies underlying complexity! No vacuum - closed to prevent backfire induced retrograde flow, high vacuum - minimal flow (at idle when you don't want a big swing of crankcase pressure), low vacuum - high flow when at wide open throttle the engine can easily take in extra blowby gas. Great practical summary!
Just ruddy excellent. Dude thank you so so much. I've been watching more of your videos just in the last week, you have quite a gift for knowledge transfer. Not everyone is able to do that effectively. That diagram and the way you explained it really helped me understand PCV properly. I vaguely knew it was pressure equalisation but I struggled with how and why oil could traverse all the way up to the airbox, or an intake manifold - I've seen both. I see now it's not really being drawn all that way directly, it's just oil that was _already_ in the upper area doing normal stuff, and getting through PCV or breather hoses. I've done quite some work on my car this week, have more to do and I knew checking the PCV would be part of it. I just wasn't really sure why.
Thanks for all your helpful videos man. I think if they rattle they can still be bad. Someone told me you you should only be able to blow one way through the valve which lets you know that the valve actually does have enough spring tension to hold it closed.
Just the information I was looking for! I understand the basic principles involved but I didn't what constituted valid testing. Thank you very much, sir!
thank you senyor, by watching this video I learnt a lot of mysteries about the 4 darn odd looking pipeline from the cylinder blocks to a metal square contraption above which has an air suction hose from the carbs and another large hose to the breather box on my Suzuki bandit bike, it was a mystery all these 7 years and at least I know some of the basics now, especially that ticking noise when I throttle and its cause! you reckon I can get more ponies out the bike if I dead flange them up completely? never seen that odd pipe in older bikes anyway
When you open the throttle body there is no vacuum after the throttle body, there is actually positive pressure sometimes. There can be a vacuum before the throttle body at WOT hence why there is a breather before and after.
Interesting and Educational video. Furthermore, may I ask if a small piece of pcv grommet which fell inside the port could cause problem in the future?.Many thanks buddy. Have a nice weekend. God Bless.
Hi. I would like to ask something if the following is true: If you open the oil fill cap during operation at idle and put your hand close to the oil fill hole you should fill some gas pulsations. This is normal because the valve is almost closed. However, when you open the throttle, the pulsations are lost, since the pcv valve opens. Is this a way to check your pcv valve?
Well there is a little bit more to it. At idle when manifold pressures are high/"high vacuum," and low crankcase pressure pushing on one side of the valve, and suction on the other side of the valve, the valve will remain in the closed position. As throttle opens, manifold pressures drop opening the valve, relieving crankcase pressure. At idle a pcv valve should be closed, otherwise a vacuum leak is created, dropping manifold pressures, decreasing the valves ability to close. At idle a engine, unless it's wore out, doesn't really require crankcase pressures to be relieved, only at part or wide open throttle, for it is then the crankcase pressures build.
Hi There, Thank you for the awesome videos. You have definitely improved my car/engine knowledge. I drive a volkswagen 1.8T polo gti 9N3. On idle, if I remove the oil cap, should I feel a vacuum?
Thanks for explaining plus showing a Toyota Camry cause I have a 2004 2.4 4 cylinder and changed mine and now the car gets what it was originally intended to get the mileage 24 city and 30 hyw. Thanks
I just di the PCV valve in my '04 Astro van - The existing PCV valve tested fine BUT, when applying brake pressure when the vehicle was in gear it rattled wildly and was loud so I decided to replace it anyhow ($2.85) it seems to have solved my issue
Awesome video!! I’m actually running into some oil pressure issues. Decided to test my pcv valve just like in the video but the car did not want to start. Any reason why??? Any help would be greatly appreciated.
very good video. What is year of the vehicle? seem toyota Camry or Celica? I have Celica GT 1990 ... wonder where is PCV valve located? can find any similar PCV valve you show!!
Thanks good vid. So if the pcv valve is off, would the pressure be able to escape from the crank case? Seems like it would. But I guess oil could escape too. Does the valve protect oil from getting into the intake?
Yes, and thats how it was done back in the day (pre 1960's) they had a hose I believe that just let the crankcase pressure escape into the atmosphere. Now those are pollutants so you cant let them escape into the atmosphere anymore but through the pcv valve they get recycled back through the engine and burned off. The valve is supposed to keep oil from escaping into the intake but some minor amount will get into the intake no matter what.
Great video. But is that the case with all vehicles? Are all of them ventilated through the valve casing? Why some use a PCV line coming directly from the crankcase and others are like this Toyota? Also I know some use an oil/air separator before the gasses are returned but it seems there is no such thing in this Toyota?
Stefan Ovcharov Good questions, I am not sure. But if I had to guess I would say the newer the cars more likely they would use an oil catch, and older they are more likely they would use the vent directly from the crankcase. cheers
Many new cars use a fixed orifice instead of the vacuum controlled variable valve. So many people still think it works in the same way but it doesn't. A fixed orifice allows only so much air flow at idle, when vacuum is highest and crankcase gases are lowest. When the throttle opens, vacuum drops and thus air flow across the orifice is reduced substantially. Can you do another video on orifice type PCV systems.
Thanks for posting if my Jeep is smoking a little and it's because of a bad pcv valve and I change it will the car stop smoking or is that from the calender, piston ring damage caused by the faulty pcv valve
To fully understand....the breather tube supplies air from the filter box to intake manifold? Because, when throttling the engine doesn't it create a vacuum at the end of the tube where is connected to the filter box ?
so..... having Oil going up through my pcv valve to my throttle plate is Ok? I have a 2000 ford taurus duratec 24valve dohc engine and the hose set up is connected behind the Throttle plate. Just changed the PCV in it and there was a little oil at the bottom of the plate. Really appreciate your videos, by the way!
Probably one of the best explanations in RUclips mentioning why PCV always has to be used with a breather tube, that clears most of my doubts. Great video brother!
The part where he mentioned how the pressure from the Crankcase travels through the Oil Way Tubes (that normally run from the Valve Head section down back to the Crankcase base/Reservoir to get resent back to the Oil Pan) up into the Valve Head section is what did it for me.
Never understood what a PCV is doing on top of the engine head if the Crankcase is down below.
Great video. Explained well. I like the fact that you explain with the diagrams and then show a real example. Very clear and understandable. Keep up the good work.
PS: This is how videos should be produced. Straight to the point and informative.
1990s cable tv style.
@@bradford_shaun_murray Exactly dude.
The PCV is one of those little marvels of universally adopted engineering. The simple appearance belies underlying complexity! No vacuum - closed to prevent backfire induced retrograde flow, high vacuum - minimal flow (at idle when you don't want a big swing of crankcase pressure), low vacuum - high flow when at wide open throttle the engine can easily take in extra blowby gas. Great practical summary!
spelunkerd o8u8o8k6
and why bad working makes engine pipe smoking?
Does Nice Blow Jobs , i guess !
Dude almost has a million subs and uses a 2x4 to hold hood I love it haha
Just ruddy excellent. Dude thank you so so much. I've been watching more of your videos just in the last week, you have quite a gift for knowledge transfer. Not everyone is able to do that effectively. That diagram and the way you explained it really helped me understand PCV properly. I vaguely knew it was pressure equalisation but I struggled with how and why oil could traverse all the way up to the airbox, or an intake manifold - I've seen both. I see now it's not really being drawn all that way directly, it's just oil that was _already_ in the upper area doing normal stuff, and getting through PCV or breather hoses.
I've done quite some work on my car this week, have more to do and I knew checking the PCV would be part of it. I just wasn't really sure why.
Good explanation, diagram and demonstration.
What happens if there's oil in the air filter box tube before throttle body
Thanks for all your helpful videos man. I think if they rattle they can still be bad. Someone told me you you should only be able to blow one way through the valve which lets you know that the valve actually does have enough spring tension to hold it closed.
Great explanation, easy to understand! Thank you!
Thank you!! is a real good information for inspect and change the PCV Valve..greetings from Guatemala City!!!
Thank you for explaining how the pcv system works. Now i really understand how the direction flows. Big Thank You
Great video bro - no messing around, clear explanation and valuable info.
First time I learn from you about PCV valve ...thanks
Excellent experiment for how to check PCV for its function. Jazakallah-o-Khair in this world
Just the information I was looking for! I understand the basic principles involved but I didn't what constituted valid testing. Thank you very much, sir!
As always, very informative. U r a genius.
best explanation so far I found about pcv...thanks. Keep up the good work.
Very helpful info as usual.. quick question.. does a faulty pcv valve cause increase fuel consumption.??
5 Years later, still great info! Thx
Pretty good explanation. Thank you !
Good explanation of how pcv works. Thanks.
You do a great job explaining things in detail
As always great video
The best to you on this holiday season
Thank you, same to you my friend. Cheers
good job Bro, please continue work hard, eastern Europe fans watching you
abacus091 Awesome, we just getting warmed up. Great to hear I have fans around the world. :)
RatchetsAnd Wrenches I have watched all of your videos.
A fan from Italy
Thanks so much for clearing all of that up. Nice touch adding testing procedures as well.
Great teaching! Thanks for sharing!
I just love your videos. Keep up the good work, you're doing so well.
Best explanation i have seen on this topic . Can you suggest a pcv valve replacement interval for a gdi turbo engine. Thanks.
Excellent explanation and illustrations
thank you senyor, by watching this video I learnt a lot of mysteries about the 4 darn odd looking pipeline from the cylinder blocks to a metal square contraption above which has an air suction hose from the carbs and another large hose to the breather box on my Suzuki bandit bike, it was a mystery all these 7 years and at least I know some of the basics now, especially that ticking noise when I throttle and its cause! you reckon I can get more ponies out the bike if I dead flange them up completely? never seen that odd pipe in older bikes anyway
Very nice drawing. Thank you!
When you open the throttle body there is no vacuum after the throttle body, there is actually positive pressure sometimes. There can be a vacuum before the throttle body at WOT hence why there is a breather before and after.
Interesting and Educational video. Furthermore, may I ask if a small piece of pcv grommet which fell inside the port could cause problem in the future?.Many thanks buddy. Have a nice weekend. God Bless.
YES. Broken pieces of grommet can cause plugging of oil passages.
SOMETIMES, you can suck 'em out with a vacuum cleaner.
Good Luck !!
Great demonstration😊thanks for the advice and tips
great info. job well done explaining the pvc valve operation and texting. Thanks
Great explanation. Very clear and understandable. Thanks very much, Pidge.
+PiDGE IAM np, glad you liked the video. cheers
you really explain things good ..keep it up brother.
thank i like all your educational video , i learn many from it , i fix my good car and make it not working
Simple and informative , excellent vid
Hi. I would like to ask something if the following is true: If you open the oil fill cap during operation at idle and put your hand close to the oil fill hole you should fill some gas pulsations. This is normal because the valve is almost closed. However, when you open the throttle, the pulsations are lost, since the pcv valve opens. Is this a way to check your pcv valve?
. Well done sir , Good explanation, diagram and demonstration
GREAT VIDEO! GREAT NARRATIVE WORK. NEW SUB. THUMBS UP!!!
great vid, so if the valve is sucking where you were putting your finger then it should be good?
They way you say "hey whats up there.." sounds like you are high...lol... Love your all vids. Thanks for explaining
Well done sir.
+Tyrone Walker ty ty
Just pulled out mine from my 4.7 V8 Dodge Dakota. What a mess, full of oil and gunk!
Yep same. Liked and subscribed :).
Perfect and straight to the point
Just changed mine. The old one had no rattle and no bounce inside. Glad I changed it!
Perfect...no body shows it better bless
Smart man thanks for you from Iraq
Great info, and camera work. Thanks much
Great stuff, very helpful
You did a great job of explaining this.
Interesting and explained well👍
Thanks for the video ,good diagram
Well there is a little bit more to it. At idle when manifold pressures are high/"high vacuum," and low crankcase pressure pushing on one side of the valve, and suction on the other side of the valve, the valve will remain in the closed position. As throttle opens, manifold pressures drop opening the valve, relieving crankcase pressure. At idle a pcv valve should be closed, otherwise a vacuum leak is created, dropping manifold pressures, decreasing the valves ability to close. At idle a engine, unless it's wore out, doesn't really require crankcase pressures to be relieved, only at part or wide open throttle, for it is then the crankcase pressures build.
Hi!! Thank you for your hard work, very good video... God bless.
UnderhooD yw, thanks for watching and commenting. cheers
Excellent video!
really good information. thanks for sharing.
Is it possible for the valve to get stuck open? And if so would it cause increased oil consumption?
Also, would it still have suction if it's stuck open?
U der best bro wel done and god bless u
Hi There,
Thank you for the awesome videos. You have definitely improved my car/engine knowledge.
I drive a volkswagen 1.8T polo gti 9N3.
On idle, if I remove the oil cap, should I feel a vacuum?
Thanks for explaining plus showing a Toyota Camry cause I have a 2004 2.4 4 cylinder and changed mine and now the car gets what it was originally intended to get the mileage 24 city and 30 hyw. Thanks
Very imformative...well done......... Kudos
Very well explained. Thnx.
Great info! thanks for the diagram.
very great information thanks friend ... keep the great work
Great explanation, thx.
Respect🔩🔧📈 Extremely Helpful thank you
Great explanation!!! Thanks!
Very theral and clear thanks very much.
Great video 👍
6:00 Is that the common way to vacuu test the valve, with your finger? I have a Ford Focus that I want to test the pressure with.
Good job. Thanks for making video.
Thanks bro needed this info
Could you explain how the blinker fluid works
hold the bottle above your head, hold your eye open and slowly squeeze on the bottle while holding it just above your eye
@@gdzeek I tried and it worked
@@MidwestDIY contact lense users rejoice!
Ask a blonde chick driving while texting lol
I just di the PCV valve in my '04 Astro van - The existing PCV valve tested fine BUT, when applying brake pressure when the vehicle was in gear it rattled wildly and was loud so I decided to replace it anyhow ($2.85) it seems to have solved my issue
Good job!
🌟Hi friend, in case of PCV valve stuck closed, the pressure will not be evacuated by the breather? 👍👍👍
Awesome video!! I’m actually running into some oil pressure issues. Decided to test my pcv valve just like in the video but the car did not want to start. Any reason why??? Any help would be greatly appreciated.
very good video. What is year of the vehicle? seem toyota Camry or Celica?
I have Celica GT 1990 ... wonder where is PCV valve located? can find any similar PCV valve you show!!
Minh VC 95 camry, not sure of that year Toyota.
Your diagram was well explained
great explanation
This PCV acts like a check valve or it allows air to pass in both directions? 👍👍👍
Thanks good vid. So if the pcv valve is off, would the pressure be able to escape from the crank case? Seems like it would. But I guess oil could escape too. Does the valve protect oil from getting into the intake?
Yes, and thats how it was done back in the day (pre 1960's) they had a hose I believe that just let the crankcase pressure escape into the atmosphere. Now those are pollutants so you cant let them escape into the atmosphere anymore but through the pcv valve they get recycled back through the engine and burned off. The valve is supposed to keep oil from escaping into the intake but some minor amount will get into the intake no matter what.
@@MattInIllinois But you're OK with dumping it into the air you breath and onto the highway.
Thank you very much, I like this video. :)
Great video. But is that the case with all vehicles? Are all of them ventilated through the valve casing? Why some use a PCV line coming directly from the crankcase and others are like this Toyota? Also I know some use an oil/air separator before the gasses are returned but it seems there is no such thing in this Toyota?
Stefan Ovcharov Good questions, I am not sure. But if I had to guess I would say the newer the cars more likely they would use an oil catch, and older they are more likely they would use the vent directly from the crankcase. cheers
RatchetsAnd Wrenches Thanx. Cheers.
Thank you for sharing.
Thank you I will try it and will share...
Its normal if u see some oil in the hose when you remove it from the pcv valve?
Do you think it can get stock open too?
Many new cars use a fixed orifice instead of the vacuum controlled variable valve. So many people still think it works in the same way but it doesn't. A fixed orifice allows only so much air flow at idle, when vacuum is highest and crankcase gases are lowest. When the throttle opens, vacuum drops and thus air flow across the orifice is reduced substantially. Can you do another video on orifice type PCV systems.
Thanks good to know this information.
Thanks for posting if my Jeep is smoking a little and it's because of a bad pcv valve and I change it will the car stop smoking or is that from the calender, piston ring damage caused by the faulty pcv valve
To fully understand....the breather tube supplies air from the filter box to intake manifold? Because, when throttling the engine doesn't it create a vacuum at the end of the tube where is connected to the filter box ?
What is that part you first pointed your finger at on the crank case?
Is it important to let the recycled air back to manifold or else just catch can and let to atmosphere ??
thanks very detail how it is work
so..... having Oil going up through my pcv valve to my throttle plate is Ok? I have a 2000 ford taurus duratec 24valve dohc engine and the hose set up is connected behind the Throttle plate. Just changed the PCV in it and there was a little oil at the bottom of the plate. Really appreciate your videos, by the way!
Its always good to clean off that excess oil on the throttle body or throttle plate.
Thank you dude
As part of maintenance, though, arent we supposed to wash out the valve with carb cleaner or wd-40 or something from time to time?
As a part of your maintenance schedule, you should REPLACE the PCV Valve at 50,000-mile intervals.