PCV valve sucking oil - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > PCV valve sucking oil

Rugged Ridge 8500lb Winch w/ Steel Cable $294.99 Shipped OSmittybilt Products at Oconee Off-Road!Building a Bumper?

Reply
Unread 05-03-2010, 07:06 AM   #1
rejeep
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: Rochester, NY
Posts: 215
PCV valve sucking oil

Before I begin.. I just want to say that I have been dealing with the issue for the better part of 18 months. Since my Jeep is not my DD I have averted the situation for this long. I have read some great info on the board pertaining to blow by and breathers blowing oil.. most of these issues seem to be on OLD engines..

I freshly rebuilt my 86í 258 with a cam and some head and block decking. I also run a TBI..
I have a slight issue with pinging since I increased the compression a bit.. but I donít believe thatís at the root cause of this, I may be however.. (I do plan on replacing the head this winter with a stock height one to bring it down a bitÖ)

The issue at hand is, my PCV valve is sucking oil at a fairly fast pace. To the point where I placed a catch can in line to catch the oil before it gets burned..
The PCV system is plumbed right to the base of the TBI, and I have a breather in the rear of the valve cover. I also have a functioning EGR.

I have been told by some people that my engine hasnít broken in yet, I used molly rings, and it may perform like this for 10 thousand miles..until the rings finally seat. At the rate I drive the jeep that may be a couple years.

I just wanted to get a few thoughts from the people here as to what they think.

One other think worth mentioning is that I used a HV oil pump.. for what it is work, could these cause excess crankcase pressure? I also am using a Westside performance aluminum valve cover.. the baffles are supposedly very good on these.

__________________
2012 WK2 SRT8 - 6.4L 470 HP beast
1988 YJ Sahara - 4.2L,AX-15,4:1,D30 w/aussie, 8.8, 4.11, 6"Lift 35"BFG/KMT2
1974 Series 3 109" SW fully restored
1964 CJ5 - V6, currently under full restoration
1949 CJ3a - 6 Volt and stock, staying that way!
rejeep is offline   Reply With Quote
Unread 05-03-2010, 07:19 AM   #2
CJFF29
Registered User
1979 CJ7 
 
Join Date: Dec 2009
Location: Frederick,MD
Posts: 185
I am interested to see what these gus have to say since although my motor is older I had enough oil blowin out to run down the inside of my hood and out across the top of my front fenders.
CJFF29 is offline   Reply With Quote
Unread 05-03-2010, 07:25 AM   #3
Jeepit85
Registered User
1985 CJ7 
 
Join Date: Feb 2010
Location: Wisconsin
Posts: 338
How is it running otherwise? Any stalling or hesitation?
__________________
85 CJ7, Howell TBI, Twin Stick, 4:10's, 35" Pitbull Rockers, Clifford 6=8, Detroits, Matkins Level II, BDS 4", Summers Brothers. Skynyrd rocks.
06 Rubicon
06 Lance Camper
02 Dodge Cummins
06 VW Jetta TDI
Jeepit85 is offline   Reply With Quote
Unread 05-03-2010, 07:56 AM   #4
rejeep
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: Rochester, NY
Posts: 215
Quote:
Originally Posted by Jeepit85 View Post
How is it running otherwise? Any stalling or hesitation?
Once warm the jeep runs great..

before it reaches operating temp the idle loops a bit, and it could stall out if not given gas.. but it warms up quickly..



I do have a bit of hesitation, but that is because I have the timing turned down a bit to curtail the ping.. If I set timing at 8* BTDC it is crisper than anything, but I get some pinging when the vac advance kicks in..



I have successfully run the jeep with correct timing w/ no ping but only on race fuel.. The head will need to be swapped out.. @ 10mpg .. $6.50 a gallon fuel isnít in the books. I still havenít given up on tuning the ignition.. I might be able to adjust the vac advance where it kicks in later and eliminate the ping.. but thatís a completely different thread for a latter time.. It runs well enough now with a compromised timing for sunny drives and off-road..
__________________
2012 WK2 SRT8 - 6.4L 470 HP beast
1988 YJ Sahara - 4.2L,AX-15,4:1,D30 w/aussie, 8.8, 4.11, 6"Lift 35"BFG/KMT2
1974 Series 3 109" SW fully restored
1964 CJ5 - V6, currently under full restoration
1949 CJ3a - 6 Volt and stock, staying that way!
rejeep is offline   Reply With Quote
Unread 05-03-2010, 07:58 AM   #5
rejeep
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: Rochester, NY
Posts: 215
Quote:
Originally Posted by CJFF29 View Post
I am interested to see what these gus have to say since although my motor is older I had enough oil blowin out to run down the inside of my hood and out across the top of my front fenders.
My oil isnt blowing out.. it is being sucked through the PCV valve..

With the breather and PCV removed I get no oil shotted out of the Valve cover..
__________________
2012 WK2 SRT8 - 6.4L 470 HP beast
1988 YJ Sahara - 4.2L,AX-15,4:1,D30 w/aussie, 8.8, 4.11, 6"Lift 35"BFG/KMT2
1974 Series 3 109" SW fully restored
1964 CJ5 - V6, currently under full restoration
1949 CJ3a - 6 Volt and stock, staying that way!
rejeep is offline   Reply With Quote
Unread 05-03-2010, 08:18 AM   #6
keith460
Jeep. There's Only One
 
keith460's Avatar
1984 CJ7 
 
Join Date: Jan 2007
Location: Doylestown, PA
Posts: 4,726
What do the baffles actually look like on that Westside Performance valve cover? The base of the PCV valve should be shielded from direct exposure of oil splashing around inside the valve cover. At least a 3 inch baffle plate should be used and the position of the PCV valve hole in the valve cover should be situated between cylinder valves.
__________________
.
1984 CJ-7 Renegade
__________________

Restoration Thread:http://www.jeepsunlimited.com/forums...d.php?t=434226
keith460 is offline   Reply With Quote
Unread 05-03-2010, 08:27 AM   #7
rejeep
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: Rochester, NY
Posts: 215
Believe it or not..
I found a guy selling one with GREAT pictures of the cover..

Here is the link, and a few pics to illustrate.. the baffle is a circular metal tab with two slits in it..

Misc Jeep Part(s) Westside Performance AMC 258 Valve Cover - Roch Hills, MI - Great Lakes 4x4. The largest offroad forum in the Midwest

__________________
2012 WK2 SRT8 - 6.4L 470 HP beast
1988 YJ Sahara - 4.2L,AX-15,4:1,D30 w/aussie, 8.8, 4.11, 6"Lift 35"BFG/KMT2
1974 Series 3 109" SW fully restored
1964 CJ5 - V6, currently under full restoration
1949 CJ3a - 6 Volt and stock, staying that way!
rejeep is offline   Reply With Quote
Unread 05-03-2010, 09:50 AM   #8
Jeepit85
Registered User
1985 CJ7 
 
Join Date: Feb 2010
Location: Wisconsin
Posts: 338
Quote:
Originally Posted by rejeep View Post
Once warm the jeep runs great..

before it reaches operating temp the idle loops a bit, and it could stall out if not given gas.. but it warms up quickly..



I do have a bit of hesitation, but that is because I have the timing turned down a bit to curtail the ping.. If I set timing at 8* BTDC it is crisper than anything, but I get some pinging when the vac advance kicks in..



I have successfully run the jeep with correct timing w/ no ping but only on race fuel.. The head will need to be swapped out.. @ 10mpg .. $6.50 a gallon fuel isnít in the books. I still havenít given up on tuning the ignition.. I might be able to adjust the vac advance where it kicks in later and eliminate the ping.. but thatís a completely different thread for a latter time.. It runs well enough now with a compromised timing for sunny drives and off-road..
Mine runs the same if not worse when it is cold. I do have some hesitations during acceleration thta I am trying to track down.
__________________
85 CJ7, Howell TBI, Twin Stick, 4:10's, 35" Pitbull Rockers, Clifford 6=8, Detroits, Matkins Level II, BDS 4", Summers Brothers. Skynyrd rocks.
06 Rubicon
06 Lance Camper
02 Dodge Cummins
06 VW Jetta TDI
Jeepit85 is offline   Reply With Quote
Unread 05-03-2010, 10:35 AM   #9
CJFF29
Registered User
1979 CJ7 
 
Join Date: Dec 2009
Location: Frederick,MD
Posts: 185
Ohhhh. So the opposite of my issue. atleast one of my issues.
CJFF29 is offline   Reply With Quote
Unread 05-06-2010, 07:57 AM   #10
rejeep
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: Rochester, NY
Posts: 215
BTT..
any other comments
__________________
2012 WK2 SRT8 - 6.4L 470 HP beast
1988 YJ Sahara - 4.2L,AX-15,4:1,D30 w/aussie, 8.8, 4.11, 6"Lift 35"BFG/KMT2
1974 Series 3 109" SW fully restored
1964 CJ5 - V6, currently under full restoration
1949 CJ3a - 6 Volt and stock, staying that way!
rejeep is offline   Reply With Quote
Unread 05-06-2010, 08:11 AM   #11
hotrod351
Registered User
1955 M-38 
 
Join Date: Oct 2006
Location: arizona
Posts: 437
yeah you have to have a baffle inside the valve cover to keep the pvc valve from sucking oil. otherwise its like taking a vacumn hose and placing it 1/4" above a can of opened oil and watching the vacuum pull the oil out of the can.
hotrod351 is offline   Reply With Quote
Unread 05-06-2010, 08:17 AM   #12
rejeep
Registered User
1988 YJ Wrangler 
 
Join Date: Nov 2005
Location: Rochester, NY
Posts: 215
i do have a baffle in there...
what sombody told me is perhaps the baffle is creating the pool..
It was actually suggested to take the baffle out and let it run open since the bottom of the baffle want be allowing an increase of suction and a pool to form...

Its an interesting idea.. and for the 20 min to take the valve cover off... it might be an option this weekend...
__________________
2012 WK2 SRT8 - 6.4L 470 HP beast
1988 YJ Sahara - 4.2L,AX-15,4:1,D30 w/aussie, 8.8, 4.11, 6"Lift 35"BFG/KMT2
1974 Series 3 109" SW fully restored
1964 CJ5 - V6, currently under full restoration
1949 CJ3a - 6 Volt and stock, staying that way!
rejeep is offline   Reply With Quote
Unread 05-06-2010, 09:53 AM   #13
hotrod351
Registered User
1955 M-38 
 
Join Date: Oct 2006
Location: arizona
Posts: 437
well if your not using any oil with the pvc valve disconnected then it has to be something in the valve cover that directing oil to the pvc valve for it to pull oil through it. but yeah id for sure take the valve cover off and check where the pvc plugs in to see if theres any way for oil to reach it.
hotrod351 is offline   Reply With Quote
Unread 10-31-2013, 10:57 PM   #14
visiontech4x4
Registered User
1989 YJ Wrangler 
 
Join Date: Apr 2013
Location: Chico, CA
Posts: 2
Bringing back an old thread here. I am having the same issue and cannot figure it out. For starters I have an 89 wrangler with the 258. It has an upgraded MSD ignition system and has been converted to a howell TBI fuel injection system. My PCV is connected to the TBI at the base where howell tell you to. The engine was just rebuilt, .030 over bore, block and head decked, new pistons, rings, valve train and oil pump. Valve stem guides were checked and are within spec. New valve stem seals. I am burning a ton of oil. In 300 miles burned 3 qts of oil fowling the plugs and dropping oil pressure. Checked the PCV system. It is full of oil. It appears the pcv system is sucking the oil into the tbi and into the intake manifold. Pulled the valve cove (stock aluminum cover) or at least what was on it when I purchased. The PCV port and vent port have a snorkle looking piece that is bolted in place with a tin baffle at the top. It appears that the system is getting enough vacuum to suck oil up the snorkle in the valve cover. The PCV valve appears to be ok. Cleaned it out and checked the internals, nothing is stuck. I am wondering if the new oil pump is pumping enough oil into the head that it is pooling up to the point of turning that snorkle (baffle) into a straw.
visiontech4x4 is offline   Reply With Quote
Unread 11-01-2013, 12:02 AM   #15
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 9,890
I'd be taking that engine back to the person who put the rings on. I'd bet one, if not more, pistons have the rings installed improperly.

Or do a compression/leak-down test.

A fresh rebuild should not blow any oil. 3 quarts in 300 miles is ridiculous.

Matt
Matt1981CJ7 is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.