Catalytic converter help...

[AmunRoo]

So here's the back story. I was driving home on the expressway and suddenly start seeing the flashing check engine and I'm feeling misfires. I had my scan tool with me so I plugged it in and found out I'm misfiring on the entire Bank 2 cylinders. A couple days before I started hearing a sort of little rattle. It was like a raspy type of rattle. So I'm thinking it may be the catalytic converter on Bank two that took a dirt nap. Once I got home, I lifted the the truck and took some temperature measurements. At the back of the cat the temperature was almost 700 degrees, while the other cat was around 350-400. I also tapped it with a rubber mallet and heard some stuff rattling around. So the plan is to replace both of them I guess. My question here now is, what are the inlet outlet sizes? I'm trying to move over to a set of high flow cats.

As always, any and I'll help is greatly appreciated

 

[BG1988]

So here's the back story. I was driving home on the expressway and suddenly start seeing the flashing check engine and I'm feeling misfires. I had my scan tool with me so I plugged it in and found out I'm misfiring on the entire Bank 2 cylinders. A couple days before I started hearing a sort of little rattle. It was like a raspy type of rattle. So I'm thinking it may be the catalytic converter on Bank two that took a dirt nap. Once I got home, I lifted the the truck and took some temperature measurements. At the back of the cat the temperature was almost 700 degrees, while the other cat was around 350-400. I also tapped it with a rubber mallet and heard some stuff rattling around. So the plan is to replace both of them I guess. My question here now is, what are the inlet outlet sizes? I'm trying to move over to a set of high flow cats.

As always, any and I'll help is greatly appreciated

if one is 700°C (1300°F) it means you're dumping fuel into it, mine barely does 450°c (850°F) normally

 

[swathdiver]

So here's the back story. I was driving home on the expressway and suddenly start seeing the flashing check engine and I'm feeling misfires. I had my scan tool with me so I plugged it in and found out I'm misfiring on the entire Bank 2 cylinders. A couple days before I started hearing a sort of little rattle. It was like a raspy type of rattle. So I'm thinking it may be the catalytic converter on Bank two that took a dirt nap. Once I got home, I lifted the the truck and took some temperature measurements. At the back of the cat the temperature was almost 700 degrees, while the other cat was around 350-400. I also tapped it with a rubber mallet and heard some stuff rattling around. So the plan is to replace both of them I guess. My question here now is, what are the inlet outlet sizes? I'm trying to move over to a set of high flow cats.

As always, any and I'll help is greatly appreciated

Put a tape around it and measure or look up by application. I replaced my Y-Pipe and cats with Magnaflow. Cheap, Chicom cats don't last a year.

 

[tom3]

I think BG is on the target here. The converter is working, but being over worked I'm thinking.

 

[Dustin Jackson]

Could also be that dumping fuel and high heat into the cat is causing it to fail. Could be a chicken or egg situation, I would try to find the cause of the rich fuel mixture in that bank.

Would a failing cat cause the bank to be rich? Which problem is the cause here?

 

[AmunRoo]

So it turned out to be a bad catalytic converter. I ended up replacing them both with flowmaster high flow cats... She's running like a champ now!

 

[Dustin Jackson]

@AmunRoo I would test the temps of the cats still to make sure one isn't getting hotter than the other one still

 

[Geotrash]

@AmunRoo I would test the temps of the cats still to make sure one isn't getting hotter than the other one still

+1. That looks like damage from a misfire. Might want to get to the bottom of the root cause before it takes out your new cat.

 

[89Suburban]

So it turned out to be a bad catalytic converter. I ended up replacing them both with flowmaster high flow cats... She's running like a champ now!

Holy crap how many miles you got on her?

 

[BG1988]

So it turned out to be a bad catalytic converter. I ended up replacing them both with flowmaster high flow cats... She's running like a champ now!

sell them it's worth some $$$$

 

[Charlie207]

So it turned out to be a bad catalytic converter. I ended up replacing them both with flowmaster high flow cats... She's running like a champ now!

How did the coverter matrix not blow out of the tailpipe?

 

[AmunRoo]

How did the coverter matrix not blow out of the tailpipe?

That is definitely a good question. I was wondering the same thing myself but I think that some stuff did make it down into the muffler. Either way, it's an excuse to buy a new muffler!

 

[AmunRoo]

sell them it's worth some $$$$

Where do I sell them?

 

[BG1988]

Where do I sell them?

ebay CL

 

[Meccanoble]

Just curious where and how much you pay for your cats? Doesnt the truck have 3 cats? 2 on the y pipes and 1 on the back of the same exhaust pipe?

 

[Charlie207]

Just curious where and how much you pay for your cats? Doesnt the truck have 3 cats? 2 on the y pipes and 1 on the back of the same exhaust pipe?

That's how mine is.

Or, two cats too many.

 

[Meccanoble]

Put a tape around it and measure or look up by application. I replaced my Y-Pipe and cats with Magnaflow. Cheap, Chicom cats don't last a year.

Which Magnaflow did you go with?

 

[swathdiver]

Which Magnaflow did you go with?

The part number is 51578.

 

[Meccanoble]

The part number is 51578.

THANK YOU! I seen another that came up that is also compatible with our trucks. Much cheaper. Any reason I should go for the 51578? Here are details:

Model 51578

Magnaflow 51578 | CADILLAC ESCALADE, CHEVROLET AVALANCHE/SUBURBAN 1500/TAHOE/SILVERADO 1500, GMC SIERRA 1500/YUKON/YUKON XL 1500 | 4.8L/5.3L/6L.6,2L | Catalytic Converter-Direct Fit | OEM Grade EPA

Magnaflow 51578 | CADILLAC ESCALADE, CHEVROLET AVALANCHE/SUBURBAN 1500/TAHOE/SILVERADO 1500, GMC SIERRA 1500/YUKON/YUKON XL 1500 | 4.8L/5.3L/6L.6,2L | Catalytic Converter-Direct Fit | OEM Grade EPA

www.hottexhaust.com

Magnaflow 51578 | CADILLAC ESCALADE, CHEVROLET AVALANCHE/SUBURBAN 1500/TAHOE/SILVERADO 1500, GMC SIERRA 1500/YUKON/YUKON XL 1500 | 4.8L/5.3L/6L.6,2L | Catalytic Converter-Direct Fit | OEM Grade EPA​

$1,070.30$1,013.00


or

Cadillac Escalade | Chevrolet Avalanche/Suburban 1500/Tahoe/Silverado 1500 | GMC Sierra 1500/Yukon/Yukon XL 1500 | 4.8L, 5.3L, 6L, 6.2L | 4WD | Catalytic Converter-Direct Fit | OEM Grade EPA

Cadillac Escalade | Chevrolet Avalanche/Suburban 1500/Tahoe/Silverado 1500 | GMC Sierra 1500/Yukon/Yukon XL 1500 | 4.8L, 5.3L, 6L, 6.2L | 4WD | Catalytic Converter-Direct Fit | OEM Grade EPA

www.hottexhaust.com

Cadillac Escalade | Chevrolet Avalanche/Suburban 1500/Tahoe/Silverado 1500 | GMC Sierra 1500/Yukon/Yukon XL 1500 | 4.8L, 5.3L, 6L, 6.2L | 4WD | Catalytic Converter-Direct Fit | OEM Grade EPA​

$1,127.83$897.77

 

[Meccanoble]

The Sku for the cheaper one is SKU: 11451578, interestin that it has the 51578 in the sku.