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Unread 09-08-2011, 05:43 PM   #1
flyin8s234
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1984 CJ7 
 
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PCV valve sucking oil

so i figured out my "blue smoke out the tail pipe" problem, my pcv valve is sucking oil, and ideas?

there are two grommets on the valve cover (stock 94' 4.0l valve cover, i have done the mpi on my 258 thats why) the front one i have left just open and then back one I'm assuming is the pcv and have hooked to the corresponding area on the manifold, is this correct?
Thanks
Tony

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Unread 09-08-2011, 05:48 PM   #2
Matt1981CJ7
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http://home.sprynet.com/~dale02/vac-pcv.htm

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Unread 09-08-2011, 05:50 PM   #3
mopar346
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Not familiar with the 4.0 cover but in general make sure there is a baffle between the hole and the rocker arm area, make sure there is no return restriction that is hold too much oil up top. YOu might try switching it to the front hole and by no means would I leave the front hole open.
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Unread 09-08-2011, 06:43 PM   #4
lucdog
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You are correct, the PCV on a 94,4.0l is in the back. The front hole takes in fresh air from the clean side of the air cleaner. Big mistake to leave the front open for the dirty air under the hood to go right into your engine. Have you removed the 5w30 crap yet?
The 5w is so thin is why its sucking thru the PCV. (my wag)

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Unread 09-08-2011, 08:41 PM   #5
wellmax
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I have a 1984 cj
one hose goes from the inside of the airfilter (filtered air) to one of the holes in the tappet cover.
the other hole has the pvc valve, the hose from the pvc valve goes to the intake manifold,
on my jeep it tees with the power brake vac line

if you are smoking out the back you may have bad rings, oil is getting past the rings, being burned and is going out the exhaust. That is another problem

some of the older units had a small air filter in the tappet cover hole that allow air to be sucked into tappet area and did not have the hose to the inside of the air filter.

do you have alot of blow by coming out of the holes in your tappet cover????

do not leave that hole open in your tappet cover as the motor will suck dirt and grit into the motor, not good, that is why they have the incoming air filtered.

good luck,
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Unread 09-08-2011, 08:54 PM   #6
PERK
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its a CCV on a FI engine not a PCV. front should connect to the air filter, rear too the manifold. with the FI on a 258 they are known to suck oil. if you see oil sitting on top of the valve cover ,you could have blow by...not good
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Unread 09-08-2011, 09:15 PM   #7
lucdog
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Wellmax and Perk, what your missing here is the OP's previous thread, were the engine didn't start smoking, untill he had the oil changed, at a quick lube place. Basically he got screwed over, on a "FREE" oil change that he ended up paying for. They put 5w30 in his 258, and there was no "smoking" till after the change.

OP, you should have posted a link to the original thread, so everyone understands the entire story.

Bill

On edit, PERK, were did you get the "sucking" oil information? He has a 4.0L head with a FI There are a number of people here with FI on their 258's. No even once, that I remember, has someone complained of this problem, due to FI, on there 258.
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 09-09-2011, 06:43 AM   #8
wellmax
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flying 8,

would putting the 5w30 oil in your engine have ruined the engine????

just drain it out and install 10w30 or whatever weight you normally run.

i have to run full synthetic oil 10w30 with about a 1/2 qt of marvel mystery oil in my old 1984 jeep as it has one valve that will stick, if you do not run this combination of lube.

believe me, old jeep that do not leak oil, like full synthetic oil, but would hate to put it in a motor that leaked or used oil.

good luck with your motor,

jeeps will run for ever, the old motor that i replaced in my old jeep was so worn that the pistons swapped cylinders every once in a while.
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