PCV inline filter
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
No idle problems here with no cleanings either with my 93 4.0L Ranger or my 91 4.0L with 200K miles or in the 94 4.0L with 160K miles. The IAC does not see any of the flow from the PCV unless the PCV system is inoperative or modified with a restriction like your restrictive filter idea. This is just not a problem with the PCV system that has been in use since the 60's and works extremely well.
Leave the PCV system alone! Put the PCV system back the way it was designed. Just remember to replace the PCV valve and check the system annually for proper operation.
If you have a problem with oil and deposits it is most likely to be because nobody replaced the PCV valve and it stopped working properly forcing oil and vapors out the other side of the engine on the intake side. All engines will have some intake deposits resulting from unburned fuel and other vapors when the engine shuts down. This was much more of a problem with the old carbureted engines than it is with EFI engines unless an injector is leaking.
The only engines that seem to need oil scrubbers and drain systems beyond the baffles that are built into the normal engine are high performance types like forced induction engines and engines that operate at VERY high RPMs. I have had some experience with those engines also.
Leave the PCV system alone! Put the PCV system back the way it was designed. Just remember to replace the PCV valve and check the system annually for proper operation.
If you have a problem with oil and deposits it is most likely to be because nobody replaced the PCV valve and it stopped working properly forcing oil and vapors out the other side of the engine on the intake side. All engines will have some intake deposits resulting from unburned fuel and other vapors when the engine shuts down. This was much more of a problem with the old carbureted engines than it is with EFI engines unless an injector is leaking.
The only engines that seem to need oil scrubbers and drain systems beyond the baffles that are built into the normal engine are high performance types like forced induction engines and engines that operate at VERY high RPMs. I have had some experience with those engines also.
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Senior User
Joined: Nov 2003
Posts: 120
Likes: 0
From: Chico Ca
Well tell me your secret for having clean carbonless intake housing after 200k? give me a brake! 
Where is absolutely nothing wrong with having an oil drop as long as it does not affect the flow of air.
If you religiously follow OEM that is fine but you never said anything beneficial having oil fumes going to the intake?
For the record its best to replace the PCV valve every so often.
Where is absolutely nothing wrong with having an oil drop as long as it does not affect the flow of air.
If you religiously follow OEM that is fine but you never said anything beneficial having oil fumes going to the intake?
For the record its best to replace the PCV valve every so often.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
I have no problems with carbon in any of my vehicles intakes except my son's 98 which the PO installed a K&N. Carbon and oil in an intake is probably from a defective or restricted PCV system or worn out engine. Oil and dirt deposits in an intake is sometimes from an over oiled K&N filter system or missing/defective air filter. There are not enough oil fumes entering the intake to bother anything in a properly functioning engine. The benefit is to the environment and it keeps the engine and oil clean. It is a great replacement for the old road draft tube.
Leave the PCV system alone, it works great with regular maintenance.
Leave the PCV system alone, it works great with regular maintenance.
Last edited by Torque1st; Feb 8, 2006 at 10:38 AM.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
I think your concerns about oil vapors are exaggerated but also I do not think that it would cause any kind of trouble to install a baffled container, mounted down low, in line with your pcv valve. Use large diameter tubing to insure that you do not restrict the system in any way.
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