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  #1  
Old 11-17-2002, 05:29 PM
BroncoScott BroncoScott is offline
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Why does my exhaust smell so bad?

I have been told a bad O2 sensor can cause it. Any ideas?



'89 302 AOD Bronco, Grant wheel, junk '31 tires for now,JVC remote CD
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Old 11-17-2002, 05:42 PM
MadDAWG MadDAWG is offline
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Why does my exhaust smell so bad?

what does it smell like? If it smells like gas then it could be a bad O2.
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Old 11-17-2002, 05:53 PM
BroncoScott BroncoScott is offline
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Why does my exhaust smell so bad?

Sulfer, rotten eggs

'89 302 AOD Bronco, Grant wheel, junk '31 tires for now,JVC remote CD,
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Old 11-17-2002, 05:53 PM
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restorit restorit is offline
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Why does my exhaust smell so bad?

More than likely, it is. When the O2 sensor goes, typically, your computer will default to a richer than normal mixture to prevent damage to the engine from a mixture that may be too lean. As a result, you'll get a rotten egg smell as the richer exhaust passes through the catalytic converter.
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Old 11-17-2002, 06:01 PM
BroncoScott BroncoScott is offline
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Why does my exhaust smell so bad?

Can it be bad without being out of range enough to throw a code? My closed loop performance really is poor also.

'89 302 AOD Bronco, Grant wheel, junk '31 tires for now,JVC remote CD,
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Old 11-18-2002, 01:23 PM
sideout2 sideout2 is offline
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Why does my exhaust smell so bad?

A rotten egg smell is usually a bad Catalytic converter.
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Old 11-18-2002, 06:30 PM
BroncoScott BroncoScott is offline
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Why does my exhaust smell so bad?

I thought they just get plugged up when they don't work.

'89 302 AOD Bronco, Grant wheel, junk '31 tires for now,JVC remote CD,
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Old 11-19-2002, 09:10 AM
sideout2 sideout2 is offline
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Why does my exhaust smell so bad?

[updated:LAST EDITED ON 19-Nov-02 AT 10:12 AM (EST)]They do get plugged, but also can go "bad" as it can no longer perform properly and a rotten egg smell is one of the first signs. A bad O2 sensor can cause a funky smell, but that is from the sensor causing the engine to run rich. The smell will be more fuel like(for lack of a better work)
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Old 11-19-2002, 10:09 AM
gruveb gruveb is offline
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Why does my exhaust smell so bad?

Something you ate?

Feeding my 9 mile a gallon habit.
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Old 11-19-2002, 01:16 PM
hillbillyk hillbillyk is offline
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Why does my exhaust smell so bad?

rotten egg smell, bad catalytic converter
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Old 11-20-2002, 04:28 PM
mweeps mweeps is offline
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Why does my exhaust smell so bad?

Exhaust never smells good. But rotten egg sulfur smell has to be killer. Hope you have a strong stomach until you get it fixed. if it is Cat get a Bassani high flow cat to replace it since you are going to have to replace it.
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Old 11-20-2002, 04:30 PM
mweeps mweeps is offline
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Why does my exhaust smell so bad?

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Old 11-20-2002, 04:30 PM
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