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Old 03-27-2011, 05:52 PM   #1
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JK Intake Manifold Leaking

Has anybody else had this problem or had their intake manifold off? My Jeep is an 07 with 85,xxx on it and I just changed plugs and wires, and it did need it! Plugs were wore down pretty good! But I noticed there was oil accumulating around where the upper and lower intake meet and quite a bit. I got it at 65,xxx and ever since it has had just a little bit of hesitation when you push the throttle. I was thinking that this may be why. I'm getting ready to go to the garage and tear into it. Let me know if anybody else has any experience here.

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Old 03-27-2011, 06:40 PM   #2
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I haven't seen any 3.8's leaking yet personally. I know the 4.0 loves leaking oil at that rear main seal though...of all places it picks the nightmare spot

Hell you've won the battle already. I'd check everything out good while you have it apart. You might have a small vacuum leak.

If you're pulling manifolds and sh*t off you know more than the average bear. You don't need help :P

Just curious though, you spittin' codes from that loss of power in 1st by chance?

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Old 03-27-2011, 07:20 PM   #3
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leak

Mine is weeping under the thermostat housing. Where the front of the intake meets the block. Its slowed alot once i switched to synthetic. it started around 10k and im at 19k now.

luckily i have the Lifetime powertrain.

There is a long thread over on jeepforum.com about the JK oil leak. There are quite a few of us out there.
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Old 03-27-2011, 07:25 PM   #4
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Quote:
Originally Posted by Armedsks
Mine is weeping under the thermostat housing. Where the front of the intake meets the block. Its slowed alot once i switched to synthetic. it started around 10k and im at 19k now.

luckily i have the Lifetime powertrain.

There is a long thread over on jeepforum.com about the JK oil leak. There are quite a few of us out there.
Holy crap this is news to me. Is it always on the intake?
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Old 03-27-2011, 07:34 PM   #5
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Quote:
Originally Posted by Armedsks View Post
Mine is weeping under the thermostat housing. Where the front of the intake meets the block. Its slowed alot once i switched to synthetic. it started around 10k and im at 19k now.

luckily i have the Lifetime powertrain.

There is a long thread over on jeepforum.com about the JK oil leak. There are quite a few of us out there.
You might have the lifetime power train warranty. But, I don't think it covers seals & gaskets. I recently noticed some coolant mixed with dirt around my lower intake. I called the dealer & asked them if they have any problems with intake gaskets leaking coolant on the 3.8L. They said the intake gaskets don't leak, but the t/stat housing will leak sometimes. I don't have the lifetime power train warranty & my 3/36 has expired. They said the 5/60 powertrain doesn't cover seals & gaskets. I steam cleaned the engine last week & I'm checking periodically for the leak.
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Old 03-27-2011, 08:53 PM   #6
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Originally Posted by GroundHawg View Post
I haven't seen any 3.8's leaking yet personally. I know the 4.0 loves leaking oil at that rear main seal though...of all places it picks the nightmare spot

Hell you've won the battle already. I'd check everything out good while you have it apart. You might have a small vacuum leak.

If you're pulling manifolds and sh*t off you know more than the average bear. You don't need help :P

Just curious though, you spittin' codes from that loss of power in 1st by chance?
No codes. But 2 or 3 times in the last 6 months before my tune up it would start running horrible out of nowhere! The engine light would come on, and one time it started smelling like antifreeze real bad! I got home and lifted the hood and antifreeze was everywhere! But I couldn't find a leak and the upper hose still had pressure. The next day I went to drive it and all was fine! No misfire or leak. But I did just put a new water pump on it cause it was leaking.
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Old 03-27-2011, 09:13 PM   #7
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Quote:
Originally Posted by Codeman911

No codes. But 2 or 3 times in the last 6 months before my tune up it would start running horrible out of nowhere! The engine light would come on, and one time it started smelling like antifreeze real bad! I got home and lifted the hood and antifreeze was everywhere! But I couldn't find a leak and the upper hose still had pressure. The next day I went to drive it and all was fine! No misfire or leak. But I did just put a new water pump on it cause it was leaking.
Man, I though my problems were bad. I keep killing axle u-joints and blew a trans line at 70mph. I'm still finding trans fluid in places it sucked though. I had to drop the axle to get the new ones to the radiator. Only thing I could figure out.

Engine problems suck. Everything is a headache to get to, and if it's not a gasket, sensor, or seal, it gets expensive fast.
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Old 03-27-2011, 10:58 PM   #8
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I also use 1 qt every 3000. Anybody else? It looked like there may have been some oil getting in from the valve cover on the pass. side and or maybe from the valley. The lower gasket is a one piece metal gasket.
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Old 03-27-2011, 11:33 PM   #9
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I use about 1 quart every 9,000 on average. Haven't noticed any oil leaks.

I'm a long time away from a tune-up and would hate to pull that manifold just to look for oil.

Speaking of that...did you feed the 3 wires behind the engine? I'm curious if it would be possible to go over the intake. I've only tuned a few JK's and that's a real PITA
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Old 03-28-2011, 01:38 AM   #10
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I use about 1 quart every 9,000 on average. Haven't noticed any oil leaks.

I'm a long time away from a tune-up and would hate to pull that manifold just to look for oil.

Speaking of that...did you feed the 3 wires behind the engine? I'm curious if it would be possible to go over the intake. I've only tuned a few JK's and that's a real PITA

Yeah, I went behind. It's a lot easier than it looks. You should be able to do it in bout 30 min. If you buy MOPAR wires, they're all numbered and so are the coils. It's idiot proof.
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Old 03-28-2011, 02:08 AM   #11
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Quote:
Originally Posted by Codeman911

Yeah, I went behind. It's a lot easier than it looks. You should be able to do it in bout 30 min. If you buy MOPAR wires, they're all numbered and so are the coils. It's idiot proof.
I have no clue what wires I used. I work part-time in a 4wd shop so it's whatever they have. There's the "good" wires, and the "cheap" ones hahaha

I'll probably buy the Mopar ones for my Jeep. I don't like dicking around and changing things too much as far as engines go. I keep plugs and wires OEM.

It's kinda tough for me fishing those back there. I'm kinda short I guess (5'10ish) and I can't see lol my Jeep is lifted to boot so I stand on the bumper to do stuff
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Old 03-28-2011, 05:06 AM   #12
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I use about 1/2-3/4 qt every 3k or so. i run 6k OCI's
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Old 03-28-2011, 11:13 PM   #13
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I'm 6'1" and have to stand on the bumper! But I put the hood all the way back against the windshield and that makes a huge diff! I used to be a Chrysler mechanic, but now I'm a pencil pushing salesman, so I gotta get my fix every now and then.
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Old 03-28-2011, 11:39 PM   #14
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Quote:
Originally Posted by Codeman911
I'm 6'1" and have to stand on the bumper! But I put the hood all the way back against the windshield and that makes a huge diff! I used to be a Chrysler mechanic, but now I'm a pencil pushing salesman, so I gotta get my fix every now and then.
That's pretty cool. I don't know if I could do this full-time. I hate working on vehicles. Anything more than a fluid change I start rolling my eyes lol I'm starting to get to a point I don't want to work on my own Jeep let alone everyone else's, my dad's car, neighbor's cars...it's getting old.

Nothing easy on my Jeep has broken. It's all been crap that makes me remove the axle, pull brakes, lift heavy tires...same with these cars. Gasket leak rear of cyl 1 on a 1.9...half the engine came out. I dropped a trans pan that needed the tire and brakes pulled to get it off, no drain plug of course. Then I get upset and do dumb stuff. I forget what I was doing, but I jacked the rear of my Jeep up and it started going down the driveway towards me. Rolled like 10 feet lol oh I remember I was spray painting the frame. Nightmare. Almost killed myself.

I dread the day I have to crawl in the engine bay lol TJ's aren't bad but man, it's tough getting past that manifold on JK's. I can't even reach the damn steering box lol I gotta come up from the bottom.

Makes you wonder how folks work on H2's or those 1500's
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Old 03-28-2011, 11:52 PM   #15
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I had the lower manifold off in an hr. It's not bad. Not that many bolts. Just had to borrow fuel line disco tools.
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Old 03-30-2011, 12:43 PM   #16
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How much did you replace that lower gasket for?

I'm not losing what I'd call an alarming amount of oil, but I do pull my stick every other fill up. Come tune-up time if I see oil I'll be changing that out
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Old 12-21-2011, 10:56 PM   #17
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I just had my intake manifold gasket replaced as it was leaking. It was done under warranty on my 07 JKU. Also they said it contaminated the coolant and did a coolant flush that costed me 140$ which was BS but oh well the gasket apparently is a 600$ job

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