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Old 05-23-2011, 01:08 PM
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possible exhaust manifold leak

im 99.9% sure my manifold is leaking or cracked, so whats the easiest way to diagnose this issue without pulling the whole thing apart?

also, if/when i have to pull it apart, how do i do that? im afraid these bolts are so rusted into place that they will snap or something.

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Old 05-23-2011, 03:27 PM   #2
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Stuff a potato up the tail pipe if you are alone.
If you have help, have a victim hold a rag over the tail pipe blocking it off. Engine running of course.

You'll hear every place it's leaking.


And yeah those bolts can be a bugger. Apply liberal amounts of PB Blaster to em and let em soak, repeat. Hope for the best. If they break, time to dig out the drill and EZ-outs.......

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Old 05-23-2011, 03:32 PM   #3
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X2 on a rag (never tried a potato lol)

also seafoam will cause it to leak from the cracks, not a bad idea to seafoam it anyway, you will see every crack for sure lol, also to determine if it is the header leaking or a lifter just open the throttle slowly by hand and listen to the ticking, if it goes away when you open the throttle (usually 1000-2000 rpms will do) then it is a lifter, it will stop ticking when you open the throttle because the extra oil pressure will force it into the lifter, if the ticking gets worse when you open it, its an exhaust leak
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Old 05-23-2011, 03:35 PM   #4
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BTW if it is the header, autozone sells a nice one pretty cheap, it has the built in expansion joints to keep it from cracking (learned this from another WF member) im about to buy one after i finish moving next week, heres the header- Dorman/Exhaust Manifold (674-196) | 1999 Jeep Wrangler 4WD 6 Cylinders S 4.0L MFI | AutoZone.com_
if yours is like mine and has cracks after the collector (downpipe) autozone sells that too - Walker/Exhaust Pipe (53458) | 1999 Jeep Wrangler 4WD 6 Cylinders S 4.0L MFI | AutoZone.com_ good prices on both, i think you can find the header on ebay just a tad cheaper but if you need both might as well order them at the same place, plus it is easier to bring it back to autozone in the event it fails then mail it back for the warrenty, IMO

those are for the 4.0 btw im sure they have the 4cyl version as well just look on autozone.com if you dont have a I6
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Old 05-23-2011, 04:27 PM
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thanks. seafoam isnt a bad idea, but i just changed my oil and im not really a seafoam fan. its definitely not the lifters though. gets louder with rpm increase.
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Old 12-12-2011, 10:06 AM
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Quote:
Originally Posted by scgeek12 View Post
BTW if it is the header, autozone sells a nice one pretty cheap, it has the built in expansion joints to keep it from cracking (learned this from another WF member) im about to buy one after i finish moving next week, heres the header- Dorman/Exhaust Manifold (674-196) | 1999 Jeep Wrangler 4WD 6 Cylinders S 4.0L MFI | AutoZone.com_
if yours is like mine and has cracks after the collector (downpipe) autozone sells that too - Walker/Exhaust Pipe (53458) | 1999 Jeep Wrangler 4WD 6 Cylinders S 4.0L MFI | AutoZone.com_ good prices on both, i think you can find the header on ebay just a tad cheaper but if you need both might as well order them at the same place, plus it is easier to bring it back to autozone in the event it fails then mail it back for the warrenty, IMO

those are for the 4.0 btw im sure they have the 4cyl version as well just look on autozone.com if you dont have a I6

so i haven't started the keep in a couple of months and now im going to get ready to tackle this issue.

does anyone have any tips for removing the manifold? some of these nuts/bolts look like a pain in the you know what to get to...
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Old 12-12-2011, 01:34 PM   #7
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Originally Posted by express705 View Post
so i haven't started the keep in a couple of months and now im going to get ready to tackle this issue.

does anyone have any tips for removing the manifold? some of these nuts/bolts look like a pain in the you know what to get to...
some of them are a lot easier to get to from the bottom, there are a lot of great write-ups on how to do it online, just make sure you get one with the bellows built in, and make sure you look up the torque sequence, and torque them exactly how it says, our you will be taking it off and doing it twice
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Old 12-12-2011, 01:39 PM   #8
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I am about to install the one I got from Ebay. It was 90 bucks with a life time warranty. It seems very well made, and has the expansion joints.
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Old 12-12-2011, 01:55 PM
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Originally Posted by scgeek12 View Post
some of them are a lot easier to get to from the bottom, there are a lot of great write-ups on how to do it online, just make sure you get one with the bellows built in, and make sure you look up the torque sequence, and torque them exactly how it says, our you will be taking it off and doing it twice
do you recommend any one write up in particular?

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I am about to install the one I got from Ebay. It was 90 bucks with a life time warranty. It seems very well made, and has the expansion joints.
do you have a link for this item?
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Old 12-12-2011, 04:34 PM   #10
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this is the one i used, its not the best but it helped a lot-

NakedJeep -> Projects -> Torque Tubes


here is the torque sequence-


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Old 12-12-2011, 05:25 PM   #11
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Here is the one I ordered. The auction has ended, but you should be able to get all the info you need there.

http://www.ebay.com/itm/JEEP-EXHAUST...item19ca909c5d
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Old 12-12-2011, 06:04 PM   #12
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Quote:
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thanks. seafoam isnt a bad idea, but i just changed my oil and im not really a seafoam fan. its definitely not the lifters though. gets louder with rpm increase.
You dont put it in the oil to get it to smoke...you will have to suck it through a vacuum line...thats how I found my leak. Lots of white smoke from under the hood, traced it back to a crack in the exhaust manifold.
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Old 12-21-2011, 05:30 PM   #13
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Just did mine, what a pain in the butt!

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Old 12-22-2011, 09:08 AM
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just did mine too, will post pics shortly..
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Old 12-23-2011, 11:00 AM   #15
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Any who has put on a header, did you put on new exhaust? And, have you made any other mods to engine? DID YOU NOTICE A DIFFERENCE? Power? Fuel milage? Been thinking about doing the same to mine. I want to boost the power before going to a tire larger than a 31x10.50. My 06 seems to be lacking in power since I put them on. Trying not to get into the axles until I have to.
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Old 12-23-2011, 11:32 AM   #16
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Any gains are probably pure "butt dyno" than real numbers. The stock manifold is very non restrictive. I went with the tube header that I went with because it was 80 bucks with a lifetime warranty and included gaskets.
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Old 12-23-2011, 03:50 PM   #17
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I'm doing this...again...next week. I replace 2 on my YJ, one on my GC/ZJ, and now this is the second one I have done on my 2001 TJ. I have typically hunted down a used OEM one without cracks because I knew I wouldn't keep my Jeeps forever but this TJ is my love

I will probably go with one of you guys and get either the Autozone manifold or an eBay one but I have noticed that they don't seem to have the expansion valves when you search for 2001 TJ. Anyone know why?
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Old 12-23-2011, 06:16 PM   #18
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I'm doing this...again...next week. I replace 2 on my YJ, one on my GC/ZJ, and now this is the second one I have done on my 2001 TJ. I have typically hunted down a used OEM one without cracks because I knew I wouldn't keep my Jeeps forever but this TJ is my love

I will probably go with one of you guys and get either the Autozone manifold or an eBay one but I have noticed that they don't seem to have the expansion valves when you search for 2001 TJ. Anyone know why?
i thought they had changed the design of the header in the later TJ years to help fix the cracking, maybe thats why the 01 doesnt show the expansion joints? im not 100% sure tho
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Old 12-23-2011, 07:33 PM   #19
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Old 07-24-2014, 09:12 AM   #20
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Unhappy Help!

I'm fairly new to the forum. I recently bought a 2008 jeep Sahara and I took it to do an oil change and apparantly it has a "possible manifold leak" and an "intake crank leak". Does anyone know how much that costs to get it fix?

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