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What makes that hot cat smell? #4655625
02/04/18 10:07 AM
02/04/18 10:07 AM
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
SilverFusion2010 Offline OP
SilverFusion2010  Offline OP
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
What’s going on when you floor it for a minute or two and your cat gives off that hot cat smell. Also noticed when the driver ahead of you floors it to haul buggy around a slow driver.

Some of it seems to be a hint of sulfur, that makes sense to me since the engine will be in open loop and running rich. What’s the rest? Are deposits in the cat burning off?


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30
Re: What makes that hot cat smell? [Re: SilverFusion2010] #4655632
02/04/18 10:11 AM
02/04/18 10:11 AM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline
eyeofthetiger  Offline
Joined: Nov 2017
Posts: 683
South Carolina
I believe it is because of the sudden change to a high volume of a rich fuel mixture. I'm just glad this is about catalytic converters and not kitty cats.


2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
Re: What makes that hot cat smell? [Re: eyeofthetiger] #4655637
02/04/18 10:16 AM
02/04/18 10:16 AM
Joined: Aug 2010
Posts: 5,663
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,663
Champlain/Hudson Valley
We too were sniffing our cat as I read the title. "How opportune that Malcolm is sleeping near the radiator", I said.

I think both smells of instant operation as well as burn off is occurring when you punch it. I love scorching up a long hill for reasons such as this.

Re: What makes that hot cat smell? [Re: SilverFusion2010] #4655801
02/04/18 12:28 PM
02/04/18 12:28 PM
Joined: Dec 2017
Posts: 97
Maryland
malibuguy79 Offline
malibuguy79  Offline
Joined: Dec 2017
Posts: 97
Maryland
It tends to be worse on cars that dont get driven hard often. Its perfectly normal during WOT situations like that. Cars that get driven hard usually dont put off much smell beyond raw fuel


Greg...the exhaust guy
I have a 10 Yaris, 97 Tercel 1nzfe swap coming, 82 Malibu 1uzfe swap in progress, 84 Bonneville street/strip car
She has 18 Fit and 01 Forester

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