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Old 06-07-2011, 07:01 AM   #1
AC0QR's Avatar
Join Date: May 2011
Location: Reston, VA
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Exhaust smell on decel

1998 TJ, 4.0, 5sp.

The exhaust usually smells fine, like any other car with the catalytic converter working. However, when I take my foot off the gas in 5th and start coasting, I get a bit of exhaust smell as if the cat is not working - smells like motorcycle exhaust.

Think it's just running rich on decel? Or the cat cools down and stops working?

If it is the cat, are they fairly DIY replaceable? Do I need to mig weld it in there? Are the clamp-on ones any good (ie, do the clamps seal the exhaust in?)

Always Remember: Safety Third!
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Old 06-07-2011, 07:02 AM   #2
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Location: Centennial CO (so yeah it's Denver)
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I think my cat is bad as well. It rattles like crazy so I'm curious as to what you find out...

This post was sent by my computer, as my ESP is broken...

98' Sahara 4.0L
4" RC lift - 33" GY Dura Tracs - Custom bumpers

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Old 06-07-2011, 07:45 AM   #3
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Mines goin bad on my 98 also. Im buying a stainless hi flow cat from jegs in a few weeks.its a clamp on converter
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Old 06-07-2011, 06:45 PM   #4
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not to open a can of worms.....but I would Seafoam it. Wasn't a believer until I gave it a try
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Old 06-07-2011, 06:57 PM   #5
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Some of us are way past sea foam. If the converter is rattling then its coming apart and the only thing that will stop that from happening is a clogged muffler
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