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Possible cat converter issue?? Smell

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Old Today, 06:49 AM   #1
jpv7774
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Default Possible cat converter issue?? Smell

04 LS430 with 135k on it......just purchased...so new to me. She rides smooth as silk but I have noticed after I goose it a bit a I smell a little Cat smell......This has happened a couple of times so I cant keep blaming it on other cars. My wife blames the smell on me!!!! I did a search on this site and read a lot of dif scenarios...only a couple on LS430s..........keep in mind...my car is a garage queen. I dont drive it very much. It doesnt roll down the road smelling like rotten eggs.....I can only get her to stink after a good goosing. Some posts say to switch gas stations.....or that the stink means the cat is doing its job.......

Refreshing an old topic......maybe I can get some new answers. I was hoping if it is a cat going bad...maybe I could correct the issue before the cats crap out.
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Old Today, 07:02 AM   #2
XJSFan
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Try a few tanks of premium 93 octane gas and a bottle of BG44K... This has helped a few people I know with other cars that had the same issue.
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Old Today, 12:39 PM   #3
StanVanDam
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All makes and models of cars are susceptible to this. The general Lexus all-models TSB is EG001-03, title SULFUR ODOR FROM EXHAUST, published Feb.24, 2003. The only corrective procedure is to try a different source of fuel, as the source of the smell is from the fuel itself.

Replacing O2 sensors or catalytic converters will NOT reduce the odor.

I personally recommend using a Top Tier certified gas, of at least the minimum recommended octane specified for your car. See http://www.toptiergas.com/retailers.html for retailers in your area.
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Old Today, 05:06 PM   #4
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The car is new to me with 135K miles on it. Given some of the threads I have read and your replies....I will assume previous owner used mid grade or regular octane.........I will only run the good stuff so maybe it will clear up after a few tanks. Its not bad....But have noticed a few times for sure
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Old Today, 05:21 PM   #5
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Good gas and a drive at highway speeds to get the cats at operating temperature. If the car is only seeing local short runs less than 10 minutes that doesn't help.
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