I decided today just to replace my pcv valve and give my tb a good sprayin with some carb cleaner. Well the pcv valve was sooo dirty and clogged it was rediculous, but the most interesting part was how thick the buildup on the back of the tb butterfly was. Also, after spraying a good amount of carbcleaner into the intake a black fluid came flowing out onto the towel i had underneath. Well I did it some more and more came out, well i picked up the towel and other than the carb cleaner I smelt oil. I couldnt figure out why there would be oil, but then i realized that there is a tube connected to the valve covers that runs to the air intake hose just before the tb. After inspecting the tube i found oil just around the area of where that little aluminum tube connects to the intake tube. Other than carbon buildup is it possible for oil to leak from that tube into the intake tube and into the intake? I have only done two oil changes on this car since I got it a year ago and who knows how long it had been since it had one before that; i know it sat for about 4 months. Either way i kept spraying more stuff in there and it never stopped coming out, i mean it flowed easily, not like there was some carbon buildup and it came off little by little, i mean this stuff was black. Should I take off my upper intake and attempt to flush it out. I plan on putting in a new fuel pressure regulator and 3.1 injectors so it would be something to do when I attempt that correct.

Also, after doing this my cars idle increased by like 200RPM and was much quicker off the line. And is it ok that i removed the aluminum tube coming from the valve covers and plugged up the hole in the air intake tube? I ran some heater hose from the 90 degree angled rubber piece in the valve cover down along the firewall in case oil leaks out again, or should I just replace it with a valve cover breather assembly, and if so which one?

Just some extra stuff
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I have done just about everything to increase my air intake without physically modifying any engine parts, so you think the next step should be headers rather than fuel injectors and FPR?

Dave
Webpage

 

You're having common blow by from an aged engine.
Headers will help but seems like your mill is gonna be "dead" soon.
AND all the things ya doing now WILL HELP prolong the death sentence.
Keep at it with better spark-ignition upgrades/new chain-tensioner/curing all vacuum leaks.
Set the thing up stock, hose wise & it'll be good.
My nearly dead 85 2.8 "was like that" (cleaning & seeing stuff).
It's common on aged engine/about to pass on engine.
Run it til its dead.
Insert 3.4
Add headers during the engine swap.
IF ya need replace injectors, find the place close by ya that cleans hem for $10/each (it in NJ). When ya swap in the 3.4 ya use those 3.4 injectors anyway.

 

I live in NJ and never found a place like that...Any ideas???

 

when you say your "mill" is going to go, what do you mean by that, I am assuming you just mean the engine itself...but im probably wrong.

Dave

 

OH DAMN!!!!!
YES, (LOL!)
Mill=engine!
Do a search for the injector guy in NJ.
OR start a topic asking for places to get injectors cleaned.
There's a guy in Jersey who knows of the place, TomP.
This guy charges like $10/injector
I have never used him.
In my instance, I swapped/upgraded to the 3.4 injectors when I swapped in the 3.4 mill. The 3.4 injectors had 40,000 on them. Meaning pretty good chance like new & yes, I was fortunate.
That's why I bought used low milage engines. All the parts were "just broken in" status.
I have a spare set of 3.4 injectors, too. From the 50,000 mile 3.4 in my Blazer, which I rebuilt/used the factory issued 2SE carb intake set up (I deal with CA smog laws, so "stock is easiest to smog").
You can also go to yards & score the used injectors from various GM rides same engine size as 2.8/3.1 engines, including FWD version. Same injector!

 

The PVC is what is venting oil n crap from your engine into the intake. Its suppose to do that. Though myself long ago I unhooked it and put a small filter on the end of that tube. So the crap doesn't vent into my intake.

Taking the intake off and cleaning it is a good idea. I found tons of crap in mine. Holley throttle body cleaners work well. I also got a selection of scrub brushes at a discount store, to get in all the nooks and crannys.

 

Soaking intake, INSIDE with carb clener, letting it sit in warm sun, also HELPS loosen it.
I used a long screwdriver to also pick off chunks.
This again is what happens to aged engines and this intake set up. It's common.

 

thanks for the help guys...i plan on doing that over thanksgiving break from college, for now im just gonna shoot some carb cleaner into the intake at the end of each week.

Thanks again,

Dave

 

Actually, spray cleaner on rag & work it that way.
WAY more effective!

 

As horriffic as Ked tries to make it sound, all engines have some amount of blowby, which is why cars have PCV (positive crankcase ventilation) systems.. to vent the blowby gasses (which are corrosive) out of the crankcase and into the intake to give them another chance at burning off normally. With this comes a small amount of oil vapor, etc. Your plugged PCV valve, however, causes the system to end up reversing... rather than air and gasses flowing through the pcv valve back into the intake, the blowby pressure forces them to exit via what is normally the inlet tube for fresh air for the PCV system... with the valve cleaned/replaced, assuming the PCV line isn't clogged, all should work normally again.

 

As horriffic as Ked tries to make it sound,


WHAT I WAS SAYING and will again.

As engines age, this caking of carbon buildup is more prevelant.

In the MPFI units, it literally adheres into the upper intake, top of the unit.
The description is exactly what I saw when I removed the top of MPFI.

It's common, that's all.

When I removed the 2.8 Carb'd manifold of my 211,600 mile 85 Blazer, it was clean, spotless compared to my Firebird intake.

 

This would be the horriffic statement I was referring to.. puddling oil blowby caused by a clogged PCV system is no measure of an engine's state of health.. it just means the PCV system has been neglected to its extreme.

 

The "injector cleaner guy" is not in NJ, he is in MI. I just got my injectors back from him, but it will be some time before I get them in. The injector guy is Rich Jensen and his website is http://www.cruzinperformance.com/. $12/injector

 

If the engine got that neglected, chances are.....
The vehicle is near or over 20 years old and that's the original mill
I'll say this
My Wife's 6 in her 1968 Camaro
I installed the wrong PCV Valve.
I created excess blowby that way.
Corrrected the PYC mistake and "problem solved". Yet it leaks still but nowhere as bad as with wrong part.