Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum > Red exhaust manifold!

Join Wrangler Forum Today

Thread: Red exhaust manifold! Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
06-14-2013 12:01 AM
Scout19 And I forgot to mention I checked the plugs they seem like they have a white dust on them I just had it in the shop for an oil leak I couldn't find turned out it was where the rotor goes into the engine so the mechanic replaced it now would it needed retimed if he took it out ?
06-12-2013 07:29 PM
ebilek231 I had the same problem I had the firing order of the wires mixed up lol
06-12-2013 05:26 PM
LiquidDragon why not just unbolt the exhaust from behind the cat and punch the guts out and then bolt it all back up? I have seen this done lots of times on various types of cars and seems to be very easy to do especially on cats that are older and the internals are burnt up. just my $.02
06-12-2013 05:19 PM
ChaddG knock on your cat with a mallot, see if anything shoots out the exhaust
06-12-2013 10:26 AM
Scout19 I'm getting rid of the cat too just needed a new o2 sensor. Indiana has no emission laws so I'm hacking it off and welding pipe to the muffler. Thanks again guys I have learned so dang much from guys like y'all on this forum!
06-12-2013 01:39 AM
Tomdata 99% sure the o2 sensor won't fix it.

I still think its a restricted exhaust. Probably the catalytic converter..

What kind of vacuum did you get at idle?
06-11-2013 10:52 PM
Scout19 Well took out my o2 sensor and it looks horrible so guess I'm getting a new one and going to see how that works the vacuum test was good.
06-10-2013 10:20 PM
Scout19 Well runs good little bogged down when acceleration off the line. But going to vacuum test it tomorrow if that comes out ok . Then I'm getting a new cat.
06-10-2013 08:19 PM
Originally Posted by Tomdata View Post
Pics!!! We need pics!!!
Sorry, no pics on that one
06-10-2013 07:57 PM
outofmoney I had the same problem with some cheapie eBay stainless steel manifold. Took it to stealership and they couldn't find anything wrong. Gave it to a cousin with a jeep & he has had no problems with it for the last 3 years. Bought a ceramic coated one & had no problems with it!
06-10-2013 07:52 PM
Originally Posted by JimsJeep View Post
Had a similar problem a few years ago and it absolutely was the CAT. The header overheated and lit the adjacent plastic on fire. Car stalled right in front of my local FD just as the Chief was arriving at 6 AM. He was putting out the fire as I was emptying the vehicle of belongings.
Pics!!! We need pics!!!
06-10-2013 05:12 PM
JimsJeep Had a similar problem a few years ago and it absolutely was the CAT. The header overheated and lit the adjacent plastic on fire. Car stalled right in front of my local FD just as the Chief was arriving at 6 AM. He was putting out the fire as I was emptying the vehicle of belongings.
06-10-2013 04:45 PM
Zdrisko Clogged cat or exhaust valve not seating correctly. Does it run rough?
06-10-2013 04:34 PM
Scout19 Thanks Tom!
06-10-2013 03:13 PM
Tomdata Follow the vacuum line from the brake booster to the intake manifold. There should be a port somewhere on the manifold.
06-10-2013 02:38 PM
Scout19 Also there is no emission testing in Indiana so would it hurt to just get rid of the cat
06-10-2013 02:31 PM
Scout19 Well I do have crappy acceleration but at idle in park it revs right up. I have no check guages or check engine lights on. Where's the manifold vacuum.
06-10-2013 01:59 PM
Tomdata Probably a plugged exhaust if the check engine light is not on and there are no obd2 codes set.. If it was lean enough to make the exhaust glow red then it would be setting lean codes (unless its an o2sensor slightly out of calibration-very rare problem).

Easiest way to check for plugged exhaust is to hook up a vacuum gauge to manifold vacuum and check it at idle. Should be at least 18-20 inches. Also if he exhaust is plugged you should have a lack of power under medium to full throttle while accelerating.
06-10-2013 01:21 PM
Scout19 Oh and the cat is welded to the muffler so how do I check it.
06-10-2013 01:19 PM
Scout19 I have 128300 on the jeep. I unplugged the o2 sensor to make sure I would get a check engine like and I did.
06-10-2013 12:35 PM
Dubs99sahara Could possibly be your catalytic converter starting to plug up on you too.
06-10-2013 12:27 PM
jeepwayoflife I would check the O2 sensors. They detect the amount of gas being burned, and if they break or get covered in crud they can tell the engine to introduce more or less fuel than it needs. It looks like in your case the engine is getting less than it needs. I would start there and see. Maybe you can remove the sensors and clean them off? Second I would remove the throttle body spacer. It wont do anything for performance and like mentioned above, air could be leaking past, air that is not regulated by the intake sensor. How many miles on the jeep?
06-10-2013 12:24 PM
jeepstertj Any Check engine light? Codes? Check gauges?

With that i think you have a intake problem the engine is getting to much air and not enough fuel or vice versa.
Have you tried to remove the throttle body spacer maybe a little air is being sucked because of a bad seal.
Thats my opinion.
06-10-2013 12:19 PM
Red exhaust manifold!

Hey guys need some insight. My TJ's exhaust manifold was glowing red last night after the drive from work. Wht causes this? I checked the plugs they are white but also were gaped wrong so fixed that I haven't looked into the o2 sensor but can it make it run lean. I heard white plugs ment it was running lean. And if it is how do I get the mixture back to normal it dose have a 4.0 throttle body with spacer . Oh yeah mine is a 2.5 98 TJ. Thanks guys!

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 10:14 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC