4.7 HO oil leak/evap code that started at the same time? - JeepForum.com
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post #1 of 6 Old 03-07-2013, 09:23 PM Thread Starter
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4.7 HO oil leak/evap code that started at the same time?

Here's the deal:

I've lurked here for a long time, but haven't had a reason to post until now. I appear to have 2 issues..

I've got an 04 with the 4.7 HO that seems to have sprung a leak -- that may have stopped? After starting from cold to move into the street to snowblow - I left and my wife called to tell me that where the jeep sat after moving there was a leak of some sort.

I thought it was brake fluid - it appeared to be yellow and near the passenger side brakeline. (I changed the oil to mobile 1 800 miles or so ago at most, so the engine oil is still pretty clean) Upon further inspection it seems to have come from higher up on that side. It seems to be dripping onto the muffler now and smoking a little. The starter etc seemed to have quite a bit of oil on them (as did the brake line and the electrical (abs sensor?) on that side against the 'frame.'

Any ideas? all 3 ends of the breather hose are shot and need replacing, but I can't seem to find anything else leaking that I can see without a lift. The brakes seem fine... fluid isn't moving. To that effect, the engine oil is currently good as well. It seems unlikely that the breather hose would kick out that much oil - and it doesn't seem wet enough on top compared to what I see down on the rail/ypipe/starter/etc.

Large evap leak showed up at the same time. I didn't think they were connected but they could be. My wife actually had thought it was my car that was leaking (they were parked near eachother.) I drive the car DD, she the wj. I was PO'd that my car was leaking - but she told me that night that there as an engine code on the WJ. It's a large evap leak.. annnnd my car isn't the one leaking.. Could the two be related? I've read that there is lots of rubber to check for the evap leak - but the vents all work so the vacuum doesn't seem to be that low... And what are the odds that the two issues aren't related? Coincidence is always possible... but this is frustrating.

I let it sit in the garage for a few days and took it out until it was warm today - no more extra leaking so far under it.. and i let it get warm. I had started it a couple of times and didn't notice more dripping either...

Any guesses on either (or both) of these guys?

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post #2 of 6 Old 03-07-2013, 10:41 PM
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Could it be the valve cover and/or valve cover gasket?
The only real way to tell is clean it up and let it leak again.

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01 WJ 4.7, 247, Zone 4 Lift
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post #3 of 6 Old 03-08-2013, 08:56 AM Thread Starter
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I'm not sure how to determine if it's the rear main vs a valve cover. And so far it seems to have leaked exactly 1x. The passenger side breather hose was pushed off entirely - how much oil could jump through that?

Such a weird thing, and it bugs me that the EVAP code flipped at the same time that seemingly random leak happened.

I'll clean it up and start/stop it a few times and see if anything shows up. There was some dripping onto the Y pipe and smoking after a short drive...
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post #4 of 6 Old 03-08-2013, 05:48 PM Thread Starter
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So, I put it up and ran it some.. can't get more oil to come out of it.. pulled the battery and the code isn't back after a couple of starts... I .. don't get it.
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post #5 of 6 Old 03-08-2013, 06:09 PM
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2003 WJ 
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Could be the Valve Cover. I had the same issue. Changed the oil. Drivers side valve cover gasket right at the back of the engine started to leak every so slightly. Took off the cover gasket was bad replaced. Problem fixed.. Also I did notice that all of the rubber on the vacuum lines was starting to dry out have a few small splits and cracks. Started replacing the ones I noticed and I did a check (before and after I changed these rubber connectors not lines) and I had lower Vacuum per my scan tool. once I replaced the ones that were cracking it was exactly at spec.. So it could be both..
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post #6 of 6 Old 03-08-2013, 10:25 PM Thread Starter
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Ugh, I'm hoping that this will.. just not reappear and I can pretend I never saw the light or the oil.. I want to drive it more and just watch the oil levels and see how it does.
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