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Old 04-22-2010, 02:24 AM   #1
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exhaust header glows

Need help figuring out why my 2003 wrangler TJ 6 cylinder header glows red hot. The only times I have noticed this happening is when I start from a dead stop at the bottom of a fairly steep grade, driving up a winding road at about 65mph for about 3 or 4 miles. I have to get the tach to 3k between shifts to get speed up to make it up the hill and then I have to pretty much keep it floored in fourth to keep my speed at 60-65. Sometimes when I shift from 2nd to 3rd I get a backfire but not always. None of my gauges indicate overheating or any other problem. No lights come on indicating a problem either. I only know that the pipes glow because I smell something burning and look under the jeep to see what is on fire but havent found anything burnt. The exhaust system is stock and has the 3 mini cats on the header. Hope I gave all the info needed, sorry it isn't in technical terms just telling it how I see it I bought a fire extinguisher because it freaked me out the first time it happened. Would appreciate any help, I don't want my baby to burn up lol. Thanks

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Old 04-22-2010, 03:09 AM   #2
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Wow thats hot!

Have you checked to make sure that those warning lights actually work? (my upshift light end check engine light didn't work when I first got mine) I can't think of any reason for the header to get that hot, other than the type of metal its made from not being rated for the kind of heat the engine produces

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Old 04-22-2010, 07:22 AM   #3
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You think his jeep could be running lean? That would make it glow
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Old 04-22-2010, 07:57 AM   #4
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You think his jeep could be running lean? That would make it glow
I believe that could also cause the backfiring.
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Old 04-22-2010, 09:06 AM   #5
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I'm not a mechanic but I had a similar problem. I regapped my spark plugs and back firing stopped and the glowing , I had my tuner look at it and he adjusted something with the air/fuel ratio and few other things and it was 100 percent fixed. Hope that helps
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Old 04-22-2010, 09:14 AM   #6
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Sounds like it is running lean. I would take it and have a scan run on it to see what codes are in the computer as a start and go from there.
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Old 04-22-2010, 09:20 AM   #7
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Such is not as uncommon as you might think. A lot of vehicles do this, just not many people actually notice (most of the time it's only noticed at night/during low-light). Exhaust gas temperatures passing through the exhaust manifold can be 1000degF, likely so if you're running it hard up a hill as described. Chances are you've nothing to worry about.
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Old 04-22-2010, 09:37 AM   #8
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Such is not as uncommon as you might think. A lot of vehicles do this, just not many people actually notice (most of the time it's only noticed at night/during low-light). Exhaust gas temperatures passing through the exhaust manifold can be 1000degF, likely so if you're running it hard up a hill as described. Chances are you've nothing to worry about.
i agree with what i quoted.
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Old 04-22-2010, 11:16 AM   #9
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If you have a stock 3.07 axle, you could be getting high head pressures and attending high exhaust temps.
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Old 04-22-2010, 04:00 PM   #10
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Glowing sounds too hot. Use a laser thermometer on the header and cats from underneath. Typical normal temp should be around 300 degrees. You won't see a glow at that temp.

Hotter than that means there's combustion going on in the exhaust - a waste of gas.

Too lean - lean means a lack of fuel, not burnable - but lean in the engine causes a misfire - unburned fuel comes out and collects in the exhaust, then it burns there and in the cats - that's why going by temperature is useful.

Rich - too much fuel in the engine - so much it misfires - too much to burn it all, again, excess burns in the exhaust.

Slightly too rich or lean won't make it misfire. If the mixture was so far off it misfires, lean or rich, it most likely will set a code.

The usual cause - ignition. Plugs not firing properly, weak coil etc.
Start there. An intermittent misfire would be enough to overheat the exhaust, but not consistent enough to set a code.
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Old 10-28-2010, 10:57 AM   #11
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3 things will do this 1. you have a air leak 2. bad spark plug 3. bad wire , when i worked for the dealer i had a insurance case that the car was burning the carpet in the driverside ,put it on the SUN machine showed a bad plug
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Old 10-28-2010, 11:45 AM   #12
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This is a very old thread - April!
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Old 10-28-2010, 12:16 PM   #13
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This is a very old thread - April!
I hate it when this happens.
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Old 10-29-2010, 02:36 PM   #14
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thanks

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This is a very old thread - April!
thank ou for letting me know , sometimes i'm up late at night and the brain isn't on . peace

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