New Catalytic converter but it gets really hot and smell real bad - JeepForum.com
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post #1 of 17 Old 04-11-2013, 03:27 PM Thread Starter
JeepingShtHpns
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New Catalytic converter but it gets really hot and smell real bad

Ijust installed a MagnaFlow California - Universal Catalytic Converter welded it in but when i accelarate with my windows down it smells BAD its like a harsh smell. It has 2 little leaks infront of the cat. that ima plug with exhaust tape i saw at the auto part store caus e i couldn't get the welder to it d today I realized it gets really hot.

could i have put it on upside down would that affect it?
could it be the leaks causing the smell?
what can i do about the heat issue? O2 sencer?

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post #2 of 17 Old 04-11-2013, 03:29 PM
COLOUXJ
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Catalytic Converters will smell bad when they are new. Its part of the chemical reaction that goes on in the converter. They also get extremely hot to make the reaction happen faster. Sounds normal to me.
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post #3 of 17 Old 04-11-2013, 03:35 PM Thread Starter
JeepingShtHpns
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Thank you the smell is like a chemical smell it feels like it burns my nose hairs lol how do you know if your O2 sencer is bad?
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post #4 of 17 Old 04-11-2013, 05:21 PM
SeanB95YJ
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could be a combination of the new catalyst reaction combined with the usual "new exhaust" smell burning off the light oil coating that's usually left by the production process

Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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post #5 of 17 Old 04-11-2013, 05:56 PM
Dirttracker18
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Why did you change the original cat?

If it went bad then you simply fixed the symptom and not the problem by changing the cat out. Cats don't wear out, something upstream damaged it. If you do not fix that, you will be changing another cat.
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post #6 of 17 Old 04-11-2013, 09:26 PM Thread Starter
JeepingShtHpns
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How long should that smell last? it has been like a week now.
And i changed it because it wouldnt pass emmisions i got a new o2 sencer when i bought it like 7 months ago and i got a new 2BB carb.
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post #7 of 17 Old 04-11-2013, 11:00 PM
LJameson
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Does it smell like a sulfer smell?

Edit: holy **** you're in canyon country. I grew up in saugus and live in Elizabeth lake now. Maybe I can check it out for ya

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post #8 of 17 Old 04-12-2013, 07:19 AM Thread Starter
JeepingShtHpns
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that would be cool and kind of a harsh smell it makes your stomach turn and the hairs stand up on the back of you neck
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post #9 of 17 Old 04-12-2013, 07:20 AM Thread Starter
JeepingShtHpns
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and my girlfriend says it smells like stong hair dye.
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post #10 of 17 Old 04-12-2013, 07:45 AM
Siva283
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Would you compare the smell to sulfer or rotten eggs? If so you are most likely running very rich. Raw gas making it to the cat will kill them fast. Are you still running the carter carb. If not your oxygen sensor is pretty useless and you should look into the nutter bypass.

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post #11 of 17 Old 04-12-2013, 05:33 PM Thread Starter
JeepingShtHpns
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it is more of a sulfer smell cause it sure and hell dont smell like rotten eggs. i am still running the carb. and i know the air/fuel mixture on the carb is not correct. how can i check the O2 sencor?
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post #12 of 17 Old 04-13-2013, 10:42 PM
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Quote:
Originally Posted by Dirttracker18 View Post
Why did you change the original cat?

If it went bad then you simply fixed the symptom and not the problem by changing the cat out. Cats don't wear out, something upstream damaged it. If you do not fix that, you will be changing another cat.
Yes they do, Its a chemical reaction going on inside that thing, eventually you run out of chemicals. But your right more often than not the honeycomb blows up before that happens.
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post #13 of 17 Old 04-15-2013, 05:44 AM
vadslram
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I would check your tune and quick!
The cat will have a little bit of forming lubicant on it but that will go away in minutes of running. If it is running hot and has a strong bad smell like you say there is too much fuel being burned in it and the only place that will come from is a too rich running engine. I know of two cases where a stuck choke started grass on fire from the cat being over worked and getting red hot.
If you run it rich for too long it will clog the passages.
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post #14 of 17 Old 04-15-2013, 07:22 AM
UZI4U
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Turn your carb lean screw to lean it out until the idle starts to get a little rough and then richen it by 1/4 to 1/2 a turn and you should be good.

MCLMM
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post #15 of 17 Old 04-15-2013, 03:37 PM
vadslram
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Quote:
Originally Posted by COLOUXJ View Post
Yes they do, Its a chemical reaction going on inside that thing, eventually you run out of chemicals. But your right more often than not the honeycomb blows up before that happens.
Practically they never run out of chemical. The elements in the blended in the catalytic matrix aren't used, they just promote the reaction without becoming part of it (very simplified they give the swing a push but don't ride it).
They do wear out if they get too hot and melt the matrix, have chemicals run through them that coat the matrix and prevent the catalytic reaction or get physically blocked or damaged. otherwise they are good enough for hundreds of thousands of miles.

Also you can get decent bucks for reycling old ones. The Platinum and Paladium in there can be recovered.
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catalytic converter , exhaust system , help needed

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