Mechanics

2 PVC VALVES ARE BAD??

1986 Jeep CJ7 • 6 cylinder 4WD Manual • 107,000 miles

I have a 86 CJ7 with a 258 i6. I was recently at a parts store and the guy told me that the back hole in the top of the engine was for a second pcv valve. At the time, it was just an open hole. Since it was about the same size as the front hole that the pvc valve was in, I didn't question him, bought a second pcv valve, installed it, and hooked it up similarly to the front pcv vlave. The engine started up fine and ran good for about 2 minutes, until it began to struggle and about 30 seconds later died. I was not able to restart it. I have since done some research and found that the back hole is for air intake. I have hooked everything back up the way it was; however, the engine won't start at all. My questions is: How much damage have I done and what can I do to get her running again?
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Redcj7
May 1, 2011.




Never heard off 2-PCV valves-it probably goes to the air cleaner-won't idle/dies out massive vacuum leak


Rasmataz
May 1, 2011.
Been out camping with the Boy Scouts (Troop 226)

Just got in!

I will send you pics of the proper PCV set up, My Jeep is a '77, I upgraded it up to a '79, when I rebuilt it, years back, using the cam for the 2 barrel BBD carb. I improved the carb too, its now a Holley 4 barrel on a "Offy 4 bbl intake.

My Actual PCV valve may look different than yours. You are S. Ucking the air out of your crankcase. It must be replenished with fresh air--Mine comes correctly out of air cleaner (Green one)

On the original (Will show you that too) It is "filtered" thru a small coarse filter pad, in the outskirts of the air cleaner.

If you were to use 2 PCVs you would draw a vacuum on the engine, it would run rough (you are really restricting air needed for correct Idle mix)

I have "Gutted" a PVC valve, just turned it into an "elbow", Just to get "Aimed" toward the air cleaner, as to keep the fresh air hose. Straighter and use less hose. As I said, after the Gutting, it was just an elbow.

The 2 cleaners together-I modified the green one, to fit over a "Weber" Carb I tried at one time. The Blue one is an original. You can see the "orange Pocket" which holds the PCV filter, in the green one you can see the filter element, but not the pocket (in shadow). The Pocket sorta clips thru the air cleaner, and provides a N. Ipple in which the hose can be connected to on the outside.

The Last pic is my current air cleaner, there is no Pocket, it just draws air from "Inside" the air cleaner (see the hole?), Shares carb filter element"

Continue to ask any CJ questions, I may have pics and explanations for much of it!

Your Turn,

The Medic
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Tiny
CJ MEDEVAC
May 1, 2011.
AS FAR AS YOUR JEEP NOT CRANKING UP AGAIN, YOU "DONE GOOD" GOING BACK THE WAY IT WAS, JUST TAKE IT ONE STEP FURTHER, AND GET #2 HOLE HOOKED TO FRESH AIR AS I DESCRIBED ABOVE.

THE NEXT STEP AS TO THE "NO START ISSUE" IS GOING TO BE AS WITH ANY OTHER VEHICLE.....WE GOTTA HAVE THESE 3 FACTORS, TO GET COMBUSTION:

FUEL

COMPRESSION

SPARK

NOW, IF WE CAN GET IT TO JUST "TRY" WITH ONE OF THESE, WE WILL SORTA KNOW WHAT DIRECTION TO PURSUE AND "MAKE IT BETTER, AND BETTER", TILL IT'S RUNNING GOOD!

THE 2 EZist TO CHECK ARE FUEL AND SPARK, WITHOUT USING ANY TOOLS

DO THIS OUTSIDE, AWAY FROM THE HOUSE AND OTHER CARS....HAVE A BLANKET HANDY TO SMOTHER SMALL CARB FIRE, AND A FIRE EXTINGUISHER HANDY, IF THINGS GET OUT OF HAND!!!

A POUR ABOUT 2-3 CAP FULLS (THAT IS PLASTIC SOFT DRINK CAPS!) OF FUEL DOWN YOUR CARB--INSTALL YOUR AIR CLEANER...DOES NOT HAVE TO BE TIGHT (THIS WILL AID IN NOT HAVING A FIRE, SHOULD IT BACK FIRE.)

TRY TO CRANK IT

DOES IT ATTEMPT TO, COUGH SPIT, WANT TO START UP?.....OR IS IT JUST "DRY" TURNING OVER AND OVER OF THE MOTOR? WITH NO HOPE?.....THIS TEST ASSUMES YOU HAVE "SPARK" AND LACK FUEL

IF THAT HAS NO EFFECT, PULL A SPARK PLUG WIRE, OFF OF A PLUG, INSERT A NAIL OF SIMILAR IN THE BOOT, IN BESIDE THE METAL PART THAT SNAPS ONTO THE SPARK PLUG....NOW HOLD THE NAIL ABOUT A 1/4 INCH OR SO, AWAY FROM THE ENGINE BLOCK, HAVE YOUR BUDDY "CRANK"/ TURN OVER THE ENGINE (OUT OF GEAR--PLEASE STAND OUT OF THE WAY!!!)....ARE YOU GETTING A NICE, CONSISTENT, POPPING SPARK FROM THE NAIL TO THE ENGINE???????? THIS TEST ASSUMES YOU HAVE FUEL, AND NO SPARK

OK SEND US THE TEST RESULTS, WE WILL HOPEFULLY KNOW WHAT DIRECTION TO SEND YOU IN GETTING YOUR FUEL OR SPARK ISSUES FIGURED OUT

HOOKING UP 2 PCVs, PROBABLY DID NOTHING EXCEPT "STARVE" THE IDLE CIRCUIT FOR AIR (ALSO MAY PROVE YOUR SYSTEM IS TIGHT, AND YOU HAVE LITTLE BLOW-BY!)

LOOK FOR VACUUM LEAKS.

DEPENDING ON EMISSIONS TESTING IN YOUR REGION, YOU MIGHT BE ABLE TO ELIMINATE, OLD, NON-WORKING, VACUUM LINES, NOW USELESS AND MAKING THINGS WORSE.....JUST HAVE 3 OR SO NECESSARY ONES, TO MAKE YOUR ENGINE WORK, AND IF YOU HAVE POWER BRAKES.

THE FOLLOWING POST MAY KINDA HELP YOU UNDERSTAND, IF YOU WILL SORTA READ THRU IT--ASK QUESTIONS (THIS POST)--I CAN SEND PICS ETC, TO AID IN YOU IN UNDERSTANDING.

http://www.2carpros.com/questions/jeep-cj7-1985-jeep-cj7-stalls-when-hot

JUST LOOKING AT MY ENGINE (I DO NOT HAVE, PWR BRAKES), I HAVE ONE EXTRA VACUUM LINE, IT GOES THRU THE FIREWALL AND TO MY VACUUM GAUGE MOUNTED IN THE DASH! (TOP RIGHT, IN THE 4-inch GAUGES) I LIKE GAUGES, CHECK OUT MY COLUMN TOO!

PLEASE RESPOND, I DO NOT DO THIS, AS TO IMPROVE ON MY HUNTING AND PECKING SKILLS...I DO THIS TO AID OTHER CJ FELLERS!!!

THE MEDIC



Tiny
CJ MEDEVAC
May 2, 2011.
I have been pondering your situation (a lot), I was wondering where you picked up Vacuum, for the 2nd PCV? Did you hook to a vacuum line, or did you just hook into "Any Ole Line"?

It would really be nice if you would respond with any news about your issue. We are not robots on this end, I hate to see a CJ with the hood up!

I know that "sick" feeling you get (all too well!), When your baby is down.

The Medic


Tiny
CJ MEDEVAC
May 3, 2011.

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