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exaust smelling like spoiled eggs


98deville

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Usually catalytic converter failure. Take it to the dealer and ask them, as the converter is covered under an extended emissions warranty.

Bruce

2016 Cadillac ATS-V gray/black

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Have you checked for codes? A rich mixture can cause this also, check the FPR, a clogged air filter, or a leaky injector.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Check your FPR

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I don't know about new cadillacs, but on older chevy's the rotten egg smell or a sulfur smell was the EGR stuck a little open.

-Dusty-

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No leaking FPR. The smell is worse inside the car than outside, just stinks up the whole inside...could it be any o2 sensors? Do I check the injectors the same way as the FPR

Well, if you FPR is good, then it could be your CAT as Bruce noted, it could be a leaky injector (that should set a code) or it could be your fuel, try changing fuels first before doing anything else... See this thread http://www.automotivehelper.com/topic71673.htm

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Do I check the injectors the same way as the FPR

You would have to pull the fuel rail and lift it so that the injector tips are exposed while someone turns the key on to energize the fuel pump (do not crank the engine). Then look for a leaky injector.

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I'll try changing where I fuel up before I try anything else could just be that.

Premium gas from Speedway and Walmart (Pilot) sometimes smells like rotten eggs in my Caddy due to the high sulfur content. Not always though.

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Is that battery under the rear seat or under the hood? Glad you got it figured out....

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The leaking battery smelled like rotton eggs (sulfur)?

Yes I was thinking that threw me off the track, rotten eggs is typically CAT related...

But I must say, he only smelled it inside the car...

That is why I asked is the battery is under the back seat in this car... I thought the interior batteries were vented outside, so I am confused how this smell was in the car...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I agree with BBF you should also check the provisions for battery venting to understand why you could smell the battery in the car. I understand it was leaking, but it still seems to me that if the venting was working properly you would not have smelled it inside the car.

Bruce

2016 Cadillac ATS-V gray/black

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