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Discussion Starter #1
Why does my 2004 Chevy Impala let off a rotten egg smell every so often? Please help. Thanks.
Smell is coming into car from vents maybe?
 
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Discussion Starter #2
It has gas.
Kidding of course but had to be said. Question where is the smell coming from? Could be from the cat.
 
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It could be coming from either the catalytic converter or the battery. If it's the battery be sure to clean everything well if it has leaked acid. A couple times of rinsing it w/ water and sprinkling baking soda on it will help keep it from eating everything under the hood. It may make a bit of a mess but that can be cleaned up later. Do it the first time when you replace the battery and again in a day or two. If the battery is fine then it must be the converter. It will have to be replaced.
 
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