Need some input on path forward with bad cats

[Trent W]

I only ask because maybe you have a slightly broken ring land.

Hmmm, Compression test is easy enough. Plus a visual on the spark plugs would tell me a bunch too. I think i'll do that first. It would confirm if its JUST bad cats.

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[Ock]

new cats from ford put in at dealer were 1200$ for me.... but i didnt have to pay that.

 

[Trent W]

new cats from ford put in at dealer were 1200$ for me.... but i didnt have to pay that.

Dang, yeah LT's are cheaper haha. Did that include labor though?

 

[Ock]

Dang, yeah LT's are cheaper haha. Did that include labor though?

yes labor and both meows

 

[Basspro302]

yes labor and both meows

Thats not to bad oem cats are expensive.

 

[Basspro302]

Make sure you fix them before going wot clogged cats can crack a ringland

 

[Trent W]

So finally got into it after the parts showed up this week. I forgot how bad headers suck to install. Yup Drivers side is totally jacked. Hope the motor is still ok. I guess i'll pull the plugs to check them and the cylinder out.

 

[Grimreaper]

What is that? Oil? Carbon build up? Never have seen the chunks like that.

 

[schmeky]

What we need are something like the 500 - 850 GESI cats that have an 02 sensor port.

Don't understand why nothing is readily available for high HP, boosted 4-valve, Coyote motor.

 

[engineermike]

Uuuuh….I see an o2 sensor bung in the fat part….which means we’re looking from where the 1st element is supposed to be. Did the first element turn into carbon rocks??? Is it totally gone???

 

[Trent W]

What is that? Oil? Carbon build up? Never have seen the chunks like that.

Part of the Cat honeycomb that melted and blew out. They have multiple layers of those honeycomb discs in the cat. You aren't supposed to see the 02 bung from the front you should be seeing cat material. I'm guessing the first one or two discs got overheated melted down clogged and then all the pressure/heat from the restricted exhaust blew it apart into slag hitting the next disc/layer of cat material. Funny enough my old F150 did the same thing when I was towing they musting up a canyon to a race event. That time it blew the entire cat hollow out the back of the exhaust with a hail of fire and metal chucks. It happened at night so it was quite the fireworks show. Truck straight piped itself and ran 2x better. Pulled over and thought my motor blew up but nope, ran a bit louder and didn't struggle towing up steep grades anymore. That's some photos of my old 5.4l it hollowed out the passengers side completely and blew a hole in the drivers side.

 

[Trent W]

Can't belive all the car did was throw a emission code. Makes way more sense to me now. I ran 4 back to back pulls against a tuned M4 and that's when i got the emission code a few hours later. 2 days later missfire codes. I think the pulls didn't give the cats time to cool back down till the next run.

 

[engineermike]

What tune is in the car?

 

[Trent W]

What tune is in the car?

its just the whipple stage 1 tune

 

[Trent W]

What we need are something like the 500 - 850 GESI cats that have an 02 sensor port.

Don't understand why nothing is readily available for high HP, boosted 4-valve, Coyote motor.

True, sounds like your having a similar problem not as bad as mine but I went with Stainless Power Offroads. Did your cats end up being bad? LT/Offroads on sale at Lethal performance for $725 Shipped.

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