Can exhaust manifold leak damage anything? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Can exhaust manifold leak damage anything?

G2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ ChBestop underseat lock boxes @ oconee off road 706 534 9955Oconee Off-Road Now Offering Zone Off-Road Products!!!

Reply
Unread 12-19-2005, 10:10 AM   #1
saxj
Registered User
1996 XJ Cherokee 
 
Join Date: Apr 2005
Location: South Africa
Posts: 240
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
saxj is offline   Reply With Quote Quick reply to this message
Unread 12-19-2005, 11:43 AM   #2
gumcrew2
Registered User
1991 XJ Cherokee 
 
Join Date: Oct 2004
Location: Denver, CO
Posts: 1,184
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.
__________________
"Nitrous? So is that like viagra for your Jeep?" -mom

"I flopped it"
gumcrew2 is offline   Reply With Quote Quick reply to this message
Unread 12-19-2005, 11:46 AM   #3
BeachinXJ
Resident McGeek
 
BeachinXJ's Avatar
2000 XJ Cherokee 
 
Join Date: Jun 2003
Location: The Beach®, DE
Posts: 5,836
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.
__________________
2000 Jeep XJ - Chopped / Locked
1997 Jeep XJ - Daily Driver
2003 Dodge Ram 2500 CTD - 6-speed, 4" MBRP Turbo Back Exhaust
Join the XJ Owners Club | Download the iMarn® iPhone App!
SIRA 4x4 Offroad Association
Rule #1 - No talking about the weather!
Homepage | Jeepspace Group|Twitter!|Facebook
BeachinXJ is offline   Reply With Quote Quick reply to this message
Unread 12-19-2005, 12:17 PM   #4
Koenig
Registered User
 
Join Date: Aug 2002
Location: Port Moody, British Columbia, Canada.
Posts: 174
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!
__________________
[SIZE=1][URL=http://www.cardomain.com/id/koenig1]1989 Jeep Cherokee Laredo [I]"Betsy"[/I][/URL]
~147,000km, 4.0l, AW4, K&N custom cone intake,
Dark Cordovan Pearl Metallic in color, 4 Dr. w/ chrome trim.[/SIZE]

Last edited by Koenig; 12-19-2005 at 01:57 PM..
Koenig is offline   Reply With Quote Quick reply to this message
Unread 12-19-2005, 02:11 PM   #5
Tweaker_G
Registered User
 
Join Date: Oct 2005
Location: Pocatello, ID
Posts: 169
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.
Tweaker_G is offline   Reply With Quote Quick reply to this message
Unread 12-20-2005, 01:26 AM   #6
saxj
Registered User
1996 XJ Cherokee 
 
Join Date: Apr 2005
Location: South Africa
Posts: 240
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
saxj is offline   Reply With Quote Quick reply to this message
Unread 12-20-2005, 08:13 AM   #7
Chip S.
Registered User
 
Join Date: Dec 2005
Posts: 79
Yes, indeed it can. The O2 sensor will read way lean, and your ecm will cause the engine to run very rich.
Chip S. is offline   Reply With Quote Quick reply to this message
Unread 12-20-2005, 09:00 AM   #8
saxj
Registered User
1996 XJ Cherokee 
 
Join Date: Apr 2005
Location: South Africa
Posts: 240
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
saxj is offline   Reply With Quote Quick reply to this message
Unread 12-20-2005, 11:53 AM   #9
Chip S.
Registered User
 
Join Date: Dec 2005
Posts: 79
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.
Chip S. is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.