Cat Converter starting to fail ~59,000 miles

[JExpedition07]

Starting to get rotten egg out the exhaust after hard runs or towing. No oil or coolant use, looks to be a failing converter from reading. Can’t warrant until it codes, which I assume is going to be after my warranty expires in 1,000 miles. Any ideas what this will run me?

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[pjc123]

If that is true and common for a 2023 after only 58,000 miles that is sad. My Honda car showed a catalytic code on just one bank after 155,000 miles. I am at 177,000 miles, haven't changed the catalytic converter, and it still runs great.

 

[Henfield]

Emissions warranty is 8 years/80k on Cats.
https://www.fordservicecontent.com/...ar_LtTruck_Hybrid_Warranty_Guide_11.28.22.pdf

 

[Buyer2021]

Any ideas what this will run me?

Nothing if it codes within another ~31k miles / ~6 years.

 

[XLT22]

A "rotten egg" smell doesn't indicate anything is failing. You can monitor the post cat sensor if you want to. What you're smelling is sulfur in the gasoline because the engine is running slightly rich under load. Although sulfur has been reduced in motor gas there's still enough to smell right on cold startup and running it hard.

FWIW I replaced more y-pipes than I can remember on the last generation of trucks. Oddly only the 2.7. Haven't heard of them being a failure item post 2020. EPA doesn't take too kindly to emissions equipment failing early.

 

[jewc75]

Trying run a top tier premium fuel when you tow. If you are using 87 just know that it will have a higher Sulphur content which will smell more.

 

[JExpedition07]

It’s pretty strong, towing my enclosed yesterday my employee was behind me and said it was very strong. I also noticed it smelled very strong of sulfur when I parked. Oddly enough the last few mornings the Cat under my driver door is rattling pretty loudly until it warms up. Has never made noise before.

 

[FaaWrenchBndr]

Trying run a top tier premium fuel when you tow. If you are using 87 just know that it will have a higher Sulphur content which will smell more.

This is gospel………

 

[XLT22]

It’s pretty strong, towing my enclosed yesterday my employee was behind me and said it was very strong. I also noticed it smelled very strong of sulfur when I parked. Oddly enough the last few mornings the Cat under my driver door is rattling pretty loudly until it warms up. Has never made noise before.

It's a large displacement V8. She's gonna smell a bit. Aftertreatment systems aren't perfect.

If you have E15 88 octane in your area you can also give that a shot. It's likely to be more like E10-E12 in reality and I've never noticed a difference in mileage compared to regular 87. It'll have slightly less stink at least using my classic Mopar as a barometer and that thing has no cats.

 

[dochawk]

Trying run a top tier premium fuel when you tow. If you are using 87 just know that it will have a higher Sulphur content which will smell more.

I'm curious as to how this could be.

At least around here, gas comes to town, and then gets octane and brand-specific additives added.

unless either sulfur gets added to 87, or gets absorbed by the octane additives, I don't see how it could be at higher levels in 87.

 

[jewc75]

Sulphur is part of crude oil.

Lets take diesel fuel for instance. Back in the day diesel used to be fairly cheap compared to gasoline because it was less refined and had a very high sulfur content. Now because of all the emissions crap we have red dye diesel (offroad diesel) and ultra low sulphur diesel. Diesel is more expensive now because it goes through a more rigorous refining process to get out the sulphur.

Another example would be if youve ever driven through an oil field and smell that rotten egg smell. Thats H2S gas, hydrogen sulfide.

 

[JExpedition07]

No smells after switching back to 93. The truck was fed 93 its whole life till the last month or so I tried 87 for a while because I put on insane miles. The 5.0 just does not like 87 octane period if you run her hard. Back to 93 and no smells or stutters.

 

[XLT22]

Sulphur is part of crude oil.

Lets take diesel fuel for instance. Back in the day diesel used to be fairly cheap compared to gasoline because it was less refined and had a very high sulfur content. Now because of all the emissions crap we have red dye diesel (offroad diesel) and ultra low sulphur diesel. Diesel is more expensive now because it goes through a more rigorous refining process to get out the sulphur.

Another example would be if youve ever driven through an oil field and smell that rotten egg smell. Thats H2S gas, hydrogen sulfide.

Non-road diesel is also ultra-low sulfur. There's no difference aside from the dye.

 

[jewc75]

Non-road diesel is also ultra-low sulfur. There's no difference aside from the dye.

Not down here in south Texas lol. If you're caught running it, its big fines.

 

[XLT22]

Not down here in south Texas lol. If you're caught running it, its big fines.

Yes it is. All diesel sold in the US is ULSD no matter if it's taxed or not.

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