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Old 06-10-2013, 11:19 AM
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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!

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Old 06-10-2013, 11:24 AM   #2
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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.

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Old 06-10-2013, 11:27 AM   #3
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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?
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Old 06-10-2013, 11:35 AM   #4
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Could possibly be your catalytic converter starting to plug up on you too.
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Old 06-10-2013, 12:19 PM
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I have 128300 on the jeep. I unplugged the o2 sensor to make sure I would get a check engine like and I did.
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Old 06-10-2013, 12:21 PM
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Oh and the cat is welded to the muffler so how do I check it.
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Old 06-10-2013, 12:59 PM   #7
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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.
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Old 06-10-2013, 01:31 PM
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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.
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Old 06-10-2013, 01:38 PM
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Also there is no emission testing in Indiana so would it hurt to just get rid of the cat
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Old 06-10-2013, 02:13 PM   #10
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Follow the vacuum line from the brake booster to the intake manifold. There should be a port somewhere on the manifold.
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Old 06-10-2013, 03:34 PM
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Thanks Tom!
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Old 06-10-2013, 03:45 PM   #12
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Clogged cat or exhaust valve not seating correctly. Does it run rough?
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Old 06-10-2013, 04:12 PM   #13
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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.
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Old 06-10-2013, 06:52 PM   #14
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Quote:
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!!!
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Old 06-10-2013, 06:57 PM   #15
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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!
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Old 06-10-2013, 07:19 PM   #16
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Pics!!! We need pics!!!
Sorry, no pics on that one
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Old 06-10-2013, 09:20 PM
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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.
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Old 06-11-2013, 09:52 PM
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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.
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Old 06-12-2013, 12:39 AM   #19
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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?
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Old 06-12-2013, 09:26 AM
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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!
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Old 06-12-2013, 04:19 PM   #21
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knock on your cat with a mallot, see if anything shoots out the exhaust
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Old 06-12-2013, 04:26 PM   #22
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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
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Old 06-12-2013, 06:29 PM   #23
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I had the same problem I had the firing order of the wires mixed up lol
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Old 06-13-2013, 11:01 PM
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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 ?
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Old 11-23-2018, 10:03 PM   #25
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i have a 97 jeep wrangler 2.5 new cat and muffler map s new 02s new intake gasket \
still glows red
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Old 11-23-2018, 10:22 PM   #26
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i have a 97 jeep wrangler 2.5 new cat and muffler map s new 02s new intake gasket \
still glows red
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