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04-02-2011, 10:14 PM | #1 | |
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cat converter getting red hot
1977 mgb, I started it for the first time this year and it seemed to be chugging and blowing black smoke out the tail pipe. I checked under the hood and the cat converter was cherry . so i shut it off right away. any ideas of what it could be? i'm guessing a plugged converter?
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04-03-2011, 07:21 AM | #2 | |
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Re: cat converter getting red hot
I would check for a cylinder that is not firing. That would push unburnt fuel into the exhaust which would explain black smoke and a overheating cat. A plugged cat should not make the black smoke. Could be a stuck float in the carb causing overfueling. There other possabilities but I would start there.
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04-03-2011, 05:07 PM | #3 | ||
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Re: cat converter getting red hot
Quote:
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07-03-2011, 05:42 PM | #4 | |
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Re: cat converter getting red hot
Another possibility are the screws securing the automatic choke assembly to the carburetor. They can back out over time thus allowing the mixture to richen. This can also cause a fuel leak leading to a fire so this should be checked in any case.
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07-30-2011, 10:06 PM | #5 | |
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Re: cat converter getting red hot
Also check similar threads @ the bottom of yours.
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