Ok, I know this has been beaten to death but I have to know! Pcv line going to the back of the lower intake is there for what purpose? At idle, there is vacuum at this line. In theory then,(not tested), there should be boost there when boost is being made. So is this pressurizing the crankcase thru the passanger side and forcing oil into the intake tube thru the driver side? Will capping this line cause any adverse effects? For example, could this cap blow off during boost. Capping this should stop a majority of the oil entering the intake system. I will be running some tests on this for the next couple of days but I just wanted some outside input. I feel that oil seperators are just a bandaid on the problem and Id like to find a solution!!!!

 

it has been siad that it acts as a drain for the oil than makes it into the intake and pools at the bottom of the manifold. i think a good seperator is the fix (and i don't mean an air compressor seperator)

 

 

Just take the hoses out, cap the holes and put breathers on the valve covers. Been running that way for 30K miles....

 

I temporarily live in the state of North Carolina where they have emission testing. So that is not an option. Besides, Im looking for a way to still use the pcv system. I capped off the line to the lower intake and have a cheap air compressor type seperator on the passanger side temporarily. Im seeing far less amounts of oil in the seperator and no oil out of driver side into the intake tube! I need to pull the blower and clean the intercooler... maybe next weekend. Big improvement though so far!

 

You won't see anything from the driver side PCV and you will see a reduced amount from the passenger side running a air compressor type moisture separator, they clog up and become useless very quickly.

 

I have tried many of the oil seperators found here at F150 and one(too expensive and too big) y'all havn't heard about. My last one is this one and it's the only one that works. 10 minute install and no containers to empty.........


Dan

 

No...., the oil gets into the PCV tube because your intake system is sucking the oil into it at idle thru full throttle.

 

Line to lower intake has been capped for a couple of days now and no oil in intake boot. Oil would accumulate in intake boot with normal no boost driving. I drive only two miles a day(maybe less) and intake boot would be caked before line was capped off!

 

It's weird, both my 03 (13,600miles) and 04 (16,000miles) have perfectly dry intake boots. Only mod is a cold air intake. My 2000 would get oil in the intake boot insanely bad. Why do some have the problem to varying degrees and some don't?? The 2000 did have the stock airbox... maybe an open air intake sucks less from the lines since there's less intake resistance?

 

A dry intake tube is normal. Contrary to popular belief this connection doesn't suck the air from the crankcase, this is where air goes in to feed the crankcase. The vacuum will always be greater on the passenger side therefore sucking air through the engine. The only reason people get the residue in the boot is do to lots of WOT runs and engine blowby over powers the function of the PCV system. If your engine has good sealing at the rings the PCV system will always keep up and you will never get oil in the intake boot.

 

I bought my 01L new in June of 2001. For a couple of months, I drove it 3-4 days a week to work and never any WOT. After about 1000 miles I noticed that about every third time I started it up, I'd get this short burst of blue smoke out the exhaust and I rarely got into boost heavy. At about 1200 miles I installed a SBTB - and it was then I found the intake tube soaked with oil and the stock throttle body crudded up. Then I did a "search" on here and on NLOC site, back in 2001, and I found this seemed to be a common problem. I put a seperator on for about a year and it seemed to help, but after getting tired of cleaning it out, I put breathers on. My L in not a daily driver and I've now had breathers for about 4 years and obviously no more oil in any intake passage. My L doesn't consume any oil and the exhaust tips are always clean inside. In my research in here years ago I found hundreds of posts addressing this issue and theory of PCV operation on an L from about 2001 - to maybe 2003 - there's some really good info on here in the past with dozens of proposed fixes that seem to work for some and not for others. The L & S separator seems to be the most popular one today. However, oddy enough, I also found that some L owners reported they did not have this problem. And a few owners back then had the problem but decided to do nothing and to let it accumulate the oil.