PCV-Valve (Positive Crankcase Vetilation) Help needed.

[uncle_ct]

Hi, all good to be back, (Sort of).

Here is the "short version". (Vacuum tree, and location of vacuum lines.)



Explantion;

Recently my 93 Ford Explorer Sport, 4.0L (pushrod) V-6, was running like crap. Abruptly..

When i started it up it would die. On restarts it would stay running with some pedal taps. I recently changed over to full synthetic oil and i had the PVC changed out. Once running it would stay running and not die out. So am getting plenty of fuel.

Open the hood like an normal person with a 4.0 IQ. I heard a hissing noice (duh). So i located the Vacuum tree near and above the PVC valve.

Here is where the mystery begins.

Since i dont have the pictures yet. I will explain what hoses i do have and what was missing. and the 2 different PVC valves i have seen for this vehicle.

From the Vacumm tree. Standing on the Driver side front tire.

The tree comes out of the Tuneport/Intake etc.

There is one plugged 3/8 port facing towards the front. Intact

Next to that one is a rubber boot which feeds a 1/8 hard plastic line back between the fire wall and wheel well. Intact.

On top of the tree is a 1/2in hose which seems to go to the Master Cylinder. Intact.

On the back right is a long rubber boot which feeds a steal hose which dips down behind the block and past the fire wall (tranny)? Intact.

Next to that is the port i found open. It sits about another which has 2 small hard plastic lines that shoot off together and find a sleeve/wire protector.

The port was shinny and clean when i found it, which indicated to me that a line or a cap had come off. Right?

I looked for 15-20 mins for a open hose and i could not locate one.

I was wondering if the House of Oil / Wanna-be Mechanics put on the wrong PVC and decided to leave that port open. (Im sorry if i am wrong).

I headed out to my local parts department to wait in line for Mr. "attitude problem" to help me. I had the Mr. "Cross-eye goober" look up the part and he came back to me with a PVC valve that looked completely different.

My previous PVC had one port, and it went to the manifold. He handed me one with 2 ports. One with the regular/standard 1/2 in hose to the manifold. and another with a 1/8 port. The PVC was looked up in the computer 2 times because i rarely trust people. (i probably should look into that, but i do live in Chicago). Anyway

The PVC valve had the smaller port on it and a attached plug for it. I am assuming this is a universal part, and can be used on many makes and models.

Or is the 2 open ports i have supposed to be connected or both pluged?

I cant believe i had to explain this much about PVC valves.. I wish my Digital camera had film in it. (kidding).


Anyone have this model ? Can you take a look for me, and let me know which is my solution?

This is not a test, i know i could hook them both up and try both ways and see which ones runs better, but looking thru the Haynes did not help and i wanted to know for sure, and not have it buzzing around in my brain.


Thanks.. CT.

 

[BrooklynBay]

Did you look at the vacuum diagram underneath the hood?

 

[shamaal]

From a 91, non automatic, no EGR.
Maybe it will help.

 

[uncle_ct]

From a 91, non automatic, no EGR.
Maybe it will help.

It is similar, but different, I appreciate it. Did you noticed the PVC and did it have one or 2 ports on it?

Not sure how much changed they made thier between the 91' and the 93'.

Excellent post, but i may have to find other explorers around my home, and ask them to pot the hood so i can look. Maybe go to the Junk yard, there is about 13 91-94 explorers there thati have been raping for years. Hopefully one of them is still intact.

Thanks again..

 

[uncle_ct]

From a 91, non automatic, no EGR.
Maybe it will help.

However , if you notice the PVC in the picture. Now that i look at it. It has 2 ports. It looks like the top small one is capped. Anyone else see that?

 

[BrooklynBay]

The one in the picture looks like it's open. I don't see a cap.

 

[shamaal]

I don't believe it's actually 'capped' IIRC it's molded that way; but yes there is that piece that sticks up on the top and it's not open.

If it helps I can pull and photograph it tomorrow.

 

[uncle_ct]

I don't believe it's actually 'capped' IIRC it's molded that way; but yes there is that piece that sticks up on the top and it's not open.

If it helps I can pull and photograph it tomorrow.

That would help,, But things seem to be running alot better, I capped the extra, PVC (small) port. and i capped the other on the "VaccumTree" (There is now 2 on the "Tree" capped. It is running much better.

But i did find another small hard black plastic line (1/8-1/16) on the other side of the motor slliced.

It has a Vacuum on it, and it connects to a small "flying saucer" looking plastic divider, the has 2 others coming off of it.. No idea what that is.. but i have to fix that one too. For now i plugged the vacuum.

Thanks..

 

[Opera House]

I bought one of those universal two port PCV valves for my 92. It had a plastic 90 degree top that did not match up with my factory tubing. These plastic two port adapters are easy to remove if your original is a straight line design. Pull it off and it is a perfect fit.

It is common for the vacuum tree caps to fall off if they get oil soaked and soften from a leaking transmission vacuum modulator. Your tranny is certainly old enough for that to happen. Check for transmission fluid at the vacuum tree.

 

[shamaal]

I'll take a picture of the PCV later today. In the meantime, your other line goes to the vacuum switch that charges the vacuum reservoir. The vacuum reservoir provides a steady vaccum source for some of the accessories, most notably the A/C Max recirc door in the passenger compartment. It's the lozenge shaped gizmo in the picture. On the later models it's a globe under the battery box.

The pic shows the vacuum lines going to the switch, it has an insulator taped over it. (Ignore the switch labelled switch, that's the A/C clutch switch)

 

[uncle_ct]

I bought one of those universal two port PCV valves for my 92. It had a plastic 90 degree top that did not match up with my factory tubing. These plastic two port adapters are easy to remove if your original is a straight line design. Pull it off and it is a perfect fit.

It is common for the vacuum tree caps to fall off if they get oil soaked and soften from a leaking transmission vacuum modulator. Your tranny is certainly old enough for that to happen. Check for transmission fluid at the vacuum tree.

My Tranny has 348 miles on it,, New rebuilt. So im sure it is fine.. Didnt need it tho.. I have 64k original on the truck. So im at that point where everything is needed to be replaced. Thanks..

I need to take a ride to the Junk yard. and look at my replacement trucks. lol

Thanks for the pics too,

 

[ward105]

uncle ct i have the exact same problem with mine. same sliced 1/8th line and vacuum port open. weird though so if i was to plug the vacuum port it would run better?. Did yours have a hesitation during acceleration? If so did that fix help?

 

[ward105]

mess up

 

[Themightyquinn]

Good reference for a 92 Ex?

From a 91, non automatic, no EGR.
Maybe it will help.

Hi, Shamaal. I have a 92 Explorer automatic trans. Would your Navajo be a good reference to use for my Ex?

 

[Currency]

Odd the second posted picture. Perhaps its just me, but my ex is not here so I cant look at it.

It states "Not Shown two capped ports". On mine the back one in that tee, closest to the intake pops off all the time. I've purchased three of those little multi packs from autozone and replaced it three times. Runs like crap when its off. Makes me sad thinking my ex is without me