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It could be running lean. Check the fuel filter. It could also be a vacuum leak or the EGR valve. It would probably be a good idea to not run it much until you've worked out the problem. There are quite a few possibilities, and some of them are not very expensive, but if the exhaust manifold is getting that hot you could be damaging your exhaust valves. If the exhaust manifold is glowing, it's not the cat-converter.

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โˆ™ 2006-03-09 19:56:28
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Q: Why would a 2000 Explorer lose power and the cab fill with smoke and smell of sulfur The manifold was glowing red Is this a Catalytic Converter problem?
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Why will catalytic converter turn red when car is running new Transmission was just installed?

When traveling home at night from a weekend camping trip, my wife noticed something glowing under the truck. It turned out to be my catalytic converter. My truck had been running poorly and I barely made it home. It turned out that one of my spark plug wires was bad (burned on the exhaust manifold) and was not firing properly. This caused unburned fuel mixture that was not burned in the cylinder to enter the converter where it would ignite and create the high temperatures, causing the converter to glow bright orange. I would say unburned fuel mixture entering your converter is causing the converter to overheat. A bad spark plug wire is only one of several causes of unburned gas. Others could be failing spark plug, stuck carburetor float, etc. Hope this helps.Magdude1ANSWER XXXXXXXXXXXXXXXXXXXXXXIt is possible but highly unlikely as a catalytic converter should NEVER go bad unless something causes it. If you have a check engine light "ON" then I would have someone with the knowledge and equipment to diagnosis it for you. It will save you alot of money. Either a very rich or lean condition will cause a converter to glow red and seem stopped up.jd1709


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