Why do breathers require a tune ? I ask this because i used to use breathers but i took them off because i didnt like the oil coming out of them and running down my valve covers ... I told my tuner about the breathers for my preditor and now i am back to using my pcv system is this ok ?

 

they require a tune because they allow un-metered air into the motor

 

Only if you don't do it correctly. I have been running mine for 2 months and about 2000 miles with no problems or check engine light. The key is to plug the ports you open up when you put on breathers then there is no way for unmetered air to enter.
jeff

 

1. Why, its like drilling a hole in the center of your plenum....it adds unmetered air to the intake system of a PCV equipped vehicle. Breathers only require a tune if you add them with a PCV system period.

2. Yes, you can continue to have your crankcase as a component of your fresh air intake system....99% of the cars on the road do. The minor adjustment your tuner made to the tune for the lean condition caused by adding a breather to a PCV equipped truck will keep your trucks A.F. a point or two safer/richer now that you have removed the breather.




https://www.f150online.com/forums/sh...hreadid=182155
Quote:
Removing the PCV from the air intake system

If you did this, it is obvious a tune change is not required. If your tuner made a tune change for this your a point or two safer/richer and nothing will change if you reconnect the PCV and remove the breathers............answers to both possibilitys cause I dont know what you did.

 

Red are you saying you get unmetered air in the engine? If so please tell me how the air gets past the valve stem seals in order to get sucked into the engine. If all 3 ports are plugged then NO unmetered air enters the engine. This is another myth like we need a boost bypass to vent boost when we slam the throttle shut which is not true on a prethrottled supercharged motor when the throttle shuts boost is stopped. Please explain I'd like to know how this is.
Thanks,
jeff

 

Here's one experienced perspective:
https://www.f150online.com/forums/sh...light=breather

 

Good reading I just do not see how a breather on the Valve cover can cause unmeterd air in the intake tract. You would have a major oil usuage problem if engine vaccume could be pulled past the lifters past the valve stem seals down the valve guides and into the combustion chamber.That is the only pathway into the intake correct.
jeff

 

In my post above I did not assume Oneevil01 completely removed the PCV....... I dont know what he did because he mentioned that he had a tune change for breathers which is a waste of time if you removed the PCV system.

Hey Jeff...... you read my posts way to fast go read it again I said above if you "add a breather to a PCV equipped truck".....meaning the PCV system is installed and you add a breather, so yes unmetered air enters the intake system. (air enters the breather which did not pass over the MAF) again only if the PCV is hooked up.


And your right "If all 3 ports are plugged then NO unmetered air enters the engine" and now your crankcase has nothing to do with your intake system so of course unmetered air is not getting in.

Its simple, the crankcase is part / or a component of the air intake system if any part of the PCV system is intact.

If you remove the PCV system, (plug 3 ports) you have removed it from the intake system and it now have nada to do with it.

I know you know this

 

Hey Red I'm with you now bad thing is I read it 3 times and still came up with the same conclusion. I thought you were on my side my bad. I guess I need to concentrate on my sunday project blower removal and intercooler cleaning.
jeff

 

You are all making this too confusing.. NO.. It does not require a tune... and PM me WITH your email address if you want the CORRECT way to do it.. i wrote the best write-up on how to remove the PCV from your intake..
-Ronnie

 

A believer here. Got your write-up sent by a friend @ NHTOC and have since printed it, read it and filed it. Thanks

 

There are sooooooooooo many opinions on this, I simply gave up.
I just put a check valve on mine and left the rest of the PCV System intact.


(I have a working PCV for the Pass Side, a second one on the Drivers Side, plus the Check Valve and Breather)

 

too confusing ? Ronnie .....This thread is answering a question from Oneevil01.
Its not a " how to do the breather mod " but thanks for adding a " CORRECT " way to do something simple that you learned from these LIGHTNING boards that has been posted and discussed a 100 times , welcome to last year .....


Confusing ? I cant see it getting any clearer than what was posted above that I guess you just didnt read.

Quote:
And your right "If all 3 ports are plugged then NO unmetered air enters the engine" and now your crankcase has nothing to do with your intake system so of course unmetered air is not getting in.

 

Condescending? I wasnt refering to you.. It seems you like to butt-in before you get the facts as well.. Lets read his first post.. "Why do breathers require a tune".. plain and simple, they dont require it.. but you can utilize the pcv system and change your tune.. but it is far from required.. and i emphasized correct because you and I both know red, that there are many posts on the wrong way to do it.. i also never mention that i am the creator of this mod.. Thanks for your input though red.. no need to take things personally..

 

I didnt think you were refering to me, I know you realize plugging ports and adding breathers can be done by a monkey....so it sounds that way when you said the best and CORRECT... but I already got over it.

But you are wrong about breathers requiring a tune....its not plain and simple, close but not plain and simple.

Oneevil01....uh has an 01 truck. You can call Mike Troyer right now(since his post was referenced here) and he will confirm or search these boards to realize that some 1999-2002 trucks did/do throw lean codes when breathers were added to PCV equipped trucks, and tuners got rid of the code with a slight tune change. Two years ago I talked with Mike over the phone about breathers and he said during testing he did on 03 trucks he realized that they were not affected by a breather and did not require a tune when a breather was added. Now we both see that 03-04 are not requiring a tune adjustment for breathers....https://www.f150online.com/forums/li...light=breather

quote:
"once in a while we'll see that a slight change needs to be made for airflow not measured by MAF"




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