EGR Vacuum Line & Oil

[Hudy]

Proudly entering my 3rd year of MJ ownership and I've stumbled on a mysterious disconnected line at my EGR.

 

Long story short, after a 200 mile trip with my MJ, I discovered an oil leak dripping from the area of the drivers engine compartment near the air box. 

Two areas of consideration: 

1) A disconnected vacuum line at the EGR. The connection at the top of the EGR Transducer is gone (?). I'm curious if a connection actually exists or if its just a plug. 

The disconnected line is pictured at the TOP of the transducer in this photo. My transducer's connection is broken off and there is no hole there at all.

 

2) My air filter was drenched in oil.

 

So this brings to question... 1: Why did oil present itself in my vacuum system after this 200 mile trip. 2: Is there an actual connection back into the transducer?

 

Thanks!

[HOrnbrod]

Sounds like the CCV valve is clogged. Disconnect the vacuum line and carefully pull out the rear CCV valve from the grommet. The small orifice at the bottom of the valve is probably clogged causing blow-by into the air filter housing. Clear the hole so you can blow through it if you can, or replace the valve. Hopefully that will cure the blow-by.  

 

What are you driving BTW??

 

 

[Hudy]

3 minutes ago, HOrnbrod said:

Sounds like the CCV valve is clogged. Disconnect the vacuum line and carefully pull out the rear CCV valve from the grommet. The small orifice at the bottom of the valve is probably clogged causing blow-by into the air filter housing. Clear the hole so you can blow through it if you can, or replace the valve. Hopefully that will cure the blow-by.  

 

What are you driving BTW??

 

Thanks for the response. Its a LWB 89 MJ 4.0 4x4!

 

Is there physically a valve inside the grommet or is it the vacuum line that enters the grommet thats clogged? I've attached a photo of the valve cover. 

 

Any idea on the transducer for the EGR? 

[HOrnbrod]

41 minutes ago, Hudy said:

Is there physically a valve inside the grommet or is it the vacuum line that enters the grommet thats clogged?

 

No physical valve; it's just a small orifice on the inner end of the plastic elbow. And yes, the vacuum line could be clogged (or broken) too causing loss of vacuum to the valve cover.

 

EDIT: Looking at your picture, it appears that the factory CCV setup on your valve cover has been modified. I don't know what's on there now, maybe someone else can ID the plumbing. I'm not a Renix expert, but I'd replace all that vacuum stuff hooked to the valve cover with factory parts.

[sinkrun]

If the above does not work, Put a newer valve cover on it they have full length baffle in them no more blowing oil ever even when the engine is worn out. can't remember the years I know mine is steel and from a 2000 XJ.

[omega_rugal]

Renix era 4.0s are very oily

[Hudy]

Thanks for all the responses.

 

I did a little research based on your responses and I think the key here will be to just replace the valve cover with a newer steel one along with the vacuum lines. I figure while I'm at the junkyard I should be able to find a EGR transducer. 

 

I'll update when its done.

Thanks again.

[SVPete]

Your photo looks exactly like the factory CCV setup.

 

I would start with new lines for your CCV since the front one looks like it is taped up. Go to Cruiser54.com and look at all things, but in this case review tips 22 and 25. Clean the openings in top of the air filter cover too, since they will get filled with gunk.

 

As far as the EGR transducer goes, basically with that connection broken, the EGR  valve will not function. When the exhaust pressure rises, that line pushes up on a diaphragm in the transducer. The diaphragm seals a vacuum bleed hole, which then allows vacuum to activate the EGR valve (provided the ECU has opened the EGR solenoid) (which then allows some exhaust gases to go to the throttle body to be burned again doing one little bit to save the environment....?).

 

It you go to a junkyard to get a transducer, carefully pop it open to ensure the spring inside hasn't rusted away.

[cruiser54]

Keep it simple. They're not all oily. the factory fix is in the second link. 

 

http://cruiser54.com/?p=121

 

http://cruiser54.com/?p=131

[Hudy]

On 10/1/2017 at 9:52 AM, cruiser54 said:

Keep it simple. They're not all oily. the factory fix is in the second link. 

 

http://cruiser54.com/?p=121

 

http://cruiser54.com/?p=131

 

Thanks everyone.

 

Two week update: I replace both vacuum line sets, the EGR, and also did the valve cover mod. So far no blow by. Will be doing a 200 mile trip soon to verify this.

Thanks again!

[cruiser54]

23 minutes ago, Hudy said:

 

Thanks everyone.

 

Two week update: I replace both vacuum line sets, the EGR, and also did the valve cover mod. So far no blow by. Will be doing a 200 mile trip soon to verify this.

Thanks again!

I'm not surprised.