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Old 12-18-2012, 06:40 PM   #1
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Glowing exhaust manifold

I have read many of the other threads that some what relate to my issue. Yet none say anything about a glowing manifold.

I just replaced the old one. I went through carefully making sure to label vac lines electrical conn. placements of bolts so I am 100% sure those are okay. When I cranked it after putting her back together she idles in the range of 2000-2200rpm. Then in about 1 minute flat the exhaust manifold is florescent orange. So I guess I am really looking for conformation that my "intake" mani is not "seated" properly. Any information would be appreciated!

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Old 12-18-2012, 06:51 PM   #2
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Its idling that high because of the massive vacuum leak you have from the manifold not being on the dowels/head correctly. Fix that and then see if it still glows, thats usually from a clogged cat converter.

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Old 12-18-2012, 07:00 PM   #3
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Just so I am clear your saying the vacuum leak from "exhaust"?
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Old 12-18-2012, 07:03 PM   #4
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Just so I am clear your saying the vacuum leak from "exhaust"?
The exhaust and the intake manifolds share a common gasket.
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Old 12-18-2012, 07:12 PM   #5
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Glowing exhaust is most often caused by a lean fuel condition or retarted timing.
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Old 12-18-2012, 07:35 PM   #6
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I don't know what motor you have but my 2.5 has 4 vacumn line connections under the TB. And one near the firewall on the intake. Glowing exhaust after that is checked I'm going to go with the cat.
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Old 12-18-2012, 07:51 PM   #7
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I wondering if I should just chop the cat out?! I am currently in route to get a new gasket. There is an Advanced AutoParts store close by but online it's not showing the oe gasket that fits both manifolds:/
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Old 12-18-2012, 07:59 PM   #8
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I wondering if I should just chop the cat out?! I am currently in route to get a new gasket. There is an Advanced AutoParts store close by but online it's not showing the oe gasket that fits both manifolds:/
Better check the laws in your state about removing the cat. No gains for doing it unless it is plugged and you replace it. Does the engine still idle high? I would figure that out first.
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Old 12-18-2012, 08:02 PM   #9
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Better check the laws in your state about removing the cat. No gains for doing it unless it is plugged and you replace it. Does the engine still idle high? I would figure that out first.
Removing the cat is illegal by federal law.

How many cats does your jeep have? Certain years have 3 (I think) and some have 1. If your jeep only has 1, down near the TC skid, Im not sure why it would be red all the way up at the headers...since the headers probably have 3-4 feet of exhaust between them and the cat.
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Old 12-18-2012, 08:31 PM   #10
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Removing the cat is illegal by federal law.

How many cats does your jeep have? Certain years have 3 (I think) and some have 1. If your jeep only has 1, down near the TC skid, Im not sure why it would be red all the way up at the headers...since the headers probably have 3-4 feet of exhaust between them and the cat.
The exhaust gasses are hottest there. I still think OP needs to address the high idle first.
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Old 12-18-2012, 09:08 PM   #11
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F@$&in auto store did not have ANY in stock.
Second I did some research and it is illegal in Florida to remove the cat. I was pretty sure I read to was optional well guess its staying for now. First chance will replace gasket and start over. Thanks for the input so far! Oh yea its a 98 4.0 6 cyl. Only the one cat in the line.
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Old 12-18-2012, 09:21 PM   #12
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That very common problem is more likely to be from not having properly positioned the intake manifold over its positioning studs, not from a blown gasket.
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Old 12-18-2012, 09:23 PM   #13
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My headers were glowing too after I replaced my exhaust manifold. The biggest thing is making sure the intake manifold is seated on the two poles. Then make sure you tighten every bolt as tight as possible. Do somewhat of a star pattern ad tighten bolts then tighten the others that got loose and tighten them and do that until they are all tight. After I did this my headers stopped glowing and my jeep stopped revving by itself.
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Old 12-18-2012, 09:25 PM   #14
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Sounds like a bad cat, idk what state you live in but if you dont have inspection drill some holes in it and see if that helps it, if it does ur ganna have to replace ur cat or straight pipe
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Old 12-18-2012, 09:26 PM   #15
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Well let me ask this if it was not seated properly and it nearly melted would that make the gasket poop? I just assumed it was not correct so get a new gasket and do it over.
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Old 12-19-2012, 01:30 PM   #16
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If your exhaust manifold was glowing right near the head then I think it is from a lean mixture. You can remove the intake again and check your gasket. If it is positioned incorrectly and "you can't get a new one" then you can put on some gasket sealer like permatex. Not the silicon based stuff. And try it again. But if the gasket is burned then you have to go new. If the glow is down by the cat then you should check to make sure the cat is not plugged from a melt down after you fix your high idle.
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Old 12-19-2012, 01:36 PM   #17
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Well let me ask this if it was not seated properly and it nearly melted would that make the gasket poop? I just assumed it was not correct so get a new gasket and do it over.
Forget the gasket, simply reposition the intake manifold so it is properly positioned over the head's short positioning studs.
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Old 12-20-2012, 10:12 PM   #18
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Okay all is "well"! I removed both manifolds inspected the gasket then re-installed everything. High RPM's are gone now she sounds great! Now the check engine light came on. Going to have it checked out, hope it will just be a simple sensor.

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