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Old 02-22-2013, 05:06 PM   #1
Join Date: Feb 2013
Posts: 3
Help Jeep runs horrible in cold weather

I have a 97 TJ that I bought earlier this year. Before I bought it the catalytic converter was removed and a straight pipe was welded. The car runs fine when the temperature outside is 45-90. When it get into the 30s or lower it starts fine but feels like it is misfiring while driving. It jerks like its missing and at idle the RPMS slightly increases and lowers back and forth. I was told by the previous owner that it is because it doesn't have a CAT so the post O2 sensor isn't doing its job. Does anyone know if this is what the problem is or if it could be something else. Thanks for the help.

97 TJ
6 cylinder
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Old 02-22-2013, 05:11 PM   #2
Join Date: Feb 2013
Posts: 3
I am planning on replacing the entire exhaust and replace the cat but I am wondering if this is most likely the problem. If it is something else I would like to fix it not but I am probably going to be waiting till spring time to replace the exhaust.
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cat , catalytic converter , cold weather , o2 sensor , oxygen sensor

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