Can exhaust manifold leak damage anything? - JeepForum.com

 
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post #1 of 9 Old 12-19-2005, 09:10 AM Thread Starter
saxj
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Question Can exhaust manifold leak damage anything?

Hi all,

Someone told me that my leaking exhaust manifold could cause burnt valves.
Is this true?

Can anything else be affected?


1996 Cherokee Limited 4x4
OME Springs, 30x9.5 M/Ts, 4.0 HO Auto, NP242
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post #2 of 9 Old 12-19-2005, 10:43 AM
gumcrew2
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Burnt valves? I highly doubt it. The only real thing it can do is make your engine run hotter (hot gasses in the engine compartment) and possibly cause premature wear on your air filter. Other than that it'll just smell funny sometimes. If it does, just open the window to get some circulation. DO NOT turn on the heat or A/C if it starts smelling weird, it'll make it worse.

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post #3 of 9 Old 12-19-2005, 10:46 AM
BeachinXJ
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Well if it gets sucked into the cab it could possibly kill you without fresh air, and it makes your xj sound like a tank on a cold morning.

Other than that, its just an annoyance.

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post #4 of 9 Old 12-19-2005, 11:17 AM
Koenig
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I think if you run an exhaust manifold leak for too long, you run the risk of warping the mating surfaces enough that if you do change it out someday, you will need to get the surface machined flat again.

How easily this will happen, i'm not really sure. I'm sure there is someone on this board with more experience than me on the subject!

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Last edited by Koenig; 12-19-2005 at 12:57 PM.
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post #5 of 9 Old 12-19-2005, 01:11 PM
Tweaker_G
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This is somewhat off topic, but I used to have an old dodge daytona and the turbo somehow rattled loose. Anyways it was blowing all that hot exhaust onto the little heat shield there. On top of that I had a leaky fuel injector that was soaking that fiberglass heat shield. I had a great time trying to use the squeegy at the gas station to get the fire out when it finally decided to burn.
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post #6 of 9 Old 12-20-2005, 12:26 AM Thread Starter
saxj
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Besides the noise and noxious fumes, anything else?

Can the O2 sensor be affected, i.e. wrong reading?

1996 Cherokee Limited 4x4
OME Springs, 30x9.5 M/Ts, 4.0 HO Auto, NP242
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post #7 of 9 Old 12-20-2005, 07:13 AM
Chip S.
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Yes, indeed it can. The O2 sensor will read way lean, and your ecm will cause the engine to run very rich.
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post #8 of 9 Old 12-20-2005, 08:00 AM Thread Starter
saxj
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I would assume this would affect fuel consumption and performance.

How much is this costing me in fuel?

1996 Cherokee Limited 4x4
OME Springs, 30x9.5 M/Ts, 4.0 HO Auto, NP242
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post #9 of 9 Old 12-20-2005, 10:53 AM
Chip S.
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Well, figure a well tuned 4.0 gets 17-18 mpg average. Take your mileage and do the math next time you fill up. Don't forget to correct for the tire size.
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