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Unread 09-13-2012, 03:39 PM   #1
Glavus
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Cracked exhaust manifold



So I decided to look for things to fix on my Jeep as does every XJ owner, and to my surprise I found a crack in the exhaust manifold. I'm not really sure if it's a huge deal but could anyone tell me the severity of this? Leave it alone or fix it? I mean I don't really notice anything, I feel a ticking in the valve cover but other than that I don't suspect a thing out of the ordinary. Do cracked exhaust manifolds have any tell tale symptoms?

Thanks guys

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Unread 09-14-2012, 02:39 AM   #2
misterdent
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It can cause your jeep to use more fuel and lower your mpg. It will pull fresh air in through crack causing your o2 sensor to think it is running too lean. Extra Gas = less money for jeeping!
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Unread 09-14-2012, 08:04 AM   #3
CRider74
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Had that happen with my 93 Wrangler, noticed it when I was replacing the motor. I put a header in and never regretted it.
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Unread 09-14-2012, 02:23 PM   #4
Whizzerbike
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If you got yourself a welder, just pull the header off and weld it back together along with all the other joints for extra support.
Will run like new if done right.
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Unread 09-15-2012, 06:48 PM   #5
98muddyjeep
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Quote:
Originally Posted by Whizzerbike
If you got yourself a welder, just pull the header off and weld it back together along with all the other joints for extra support.
Will run like new if done right.
And then watch it crack in five other places,I have welded my header (seven cracks in all) and now have five more.best to buy a aftermarket namebrand header with a warranty and be done with the problem.
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Unread 09-15-2012, 07:51 PM   #6
Motorcharge
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Buy a header and a new head gasket set, pull the head and manifolds as one piece. The exhaust is infinitely easier to remove with the entire cylinder head out and it only takes a couple hours to pull the whole thing, change the gasket, and put everything back. Might as well get it all clean and new gaskets in while you're at it.
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Unread 09-16-2012, 12:39 AM   #7
rugsucka
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I have a slightly cracked header flange where it meets my down pipe. I wouldn't pull my head and replace it unless I was swapping in an upgrade for the 0331 time bomb.

That being said, I will continue to goop muffler cement until I can gather parts to do that exactly - pull the head, install new manifold on new head, put back in as one unit.
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Unread 09-16-2012, 08:13 AM   #8
Motorcharge
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It's less work imo to just pull the whole damn thing. You figure 10 years and 100K miles, it can't really hurt to go ahead and replace the head gaskets while you're at it. Esp on a 00-01.
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