Catalytic converter Issue/suggestion on replacement?
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Catalytic converter Issue/suggestion on replacement?
Hi everyone, I'm new to this forum and happy to be a part of it. I recently purchased my first X, gasser 6.8L v10 from out west. Only 70k miles on it. Anyway the catalytic converter is making a sound that sounds similar to a head gasket leak at about 2k rpm. I want to replace the Cat but I've been reading that some OEM cats throw codes after install and codes won't go away. Any suggestions on what Cat I should buy?
Thanks!
Thanks!
Last edited by Franks721; May 15, 2019 at 10:02 PM. Reason: Clarity
Tuned
Joined: Sep 2018
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Confused
Not sure anyone can offer you help on your explanation.
Resonation is like a drone or amplification of a sound at a speed or rpm.
The stock cat is quiet and free flowing. Unless it is plugged or broken.
Walker or eastern catalytic converters are decent aftermarket. I have used many over the years for various models.
Not all v10’s have a downstream o2 sensor. You can look at yours and see.
I would do more investigation before dropping $400 plus bucks on a cat of unknown condition
my cat was plugged when I bought my truck. I didn’t know it till later. Pinged and no power at heavy throttle.
Turned out first and last honeycomb was intact but middle was crumbled and plugging it up.
I took it out and shook it around. Sounded like full of marbles. Or bag o’ glass
Resonation is like a drone or amplification of a sound at a speed or rpm.
The stock cat is quiet and free flowing. Unless it is plugged or broken.
Walker or eastern catalytic converters are decent aftermarket. I have used many over the years for various models.
Not all v10’s have a downstream o2 sensor. You can look at yours and see.
I would do more investigation before dropping $400 plus bucks on a cat of unknown condition
my cat was plugged when I bought my truck. I didn’t know it till later. Pinged and no power at heavy throttle.
Turned out first and last honeycomb was intact but middle was crumbled and plugging it up.
I took it out and shook it around. Sounded like full of marbles. Or bag o’ glass
Tuned
Joined: Sep 2018
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Also
One cat I had fail in a crv broke up and the parts went down the exhaust pipe and partially plugged the muffler.
That took a while to figure out. Had a whistle at full throttle acceleration for a long time.
Ran pretty good at 1:2 throttle or less. How i mostly drive.
Ran much better with the pieces shaken out of the muffler.
That took a while to figure out. Had a whistle at full throttle acceleration for a long time.
Ran pretty good at 1:2 throttle or less. How i mostly drive.
Ran much better with the pieces shaken out of the muffler.
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@Jakerichards1 I guess I just wanted to get a suggestion on which is the best to buy so I can replace it. I updated my post.
Tuned
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Walker
I suggest walker exhaust then. Probably the closest to oem performance you can get without oe price.
Might want to figure out what caused the early demise however. Stock can easily go double that or more. It’s required by law actually. Walker will go minimally 40k mi unless something kills it. Running rich somehow will cause it to fail.
Might want to figure out what caused the early demise however. Stock can easily go double that or more. It’s required by law actually. Walker will go minimally 40k mi unless something kills it. Running rich somehow will cause it to fail.
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From: Media PA
Hi everyone, I'm new to this forum and happy to be a part of it. I recently purchased my first X, gasser 6.8L v10 from out west. Only 70k miles on it. Anyway the catalytic converter is making a sound that sounds similar to a head gasket leak at about 2k rpm. I want to replace the Cat but I've been reading that some OEM cats throw codes after install and codes won't go away. Any suggestions on what Cat I should buy?
Thanks!
Thanks!
Can you describe the sound a little better? "Like a head gasket leak" doesn't really make the noise clear. To me and what I think of what a head gasket leak sounds like, I would first suspect an exhaust leak at the manifold due to broken stud(s), are you missing any of the 20 exhaust manifold studs? What leads you to believe that it's the cat making the noise? Is the entire stock exhaust system still intact?
Laughing Gas
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From: Northcentral Wisconsin
If you need one, I would get a Magnaflow. I'm happy with the stuff I've bought from them. Check the exhaust studs first though.
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Fleet Mechanic
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From: Los Angeles, Ca.
"Sounds like a head gasket leak". There is no typical sound they make so no clue what that means.
Bang on the cat and see if it rattles, if not it's probably ok. The next step to verify would be to remove it and see if it's broken. The only sound I've heard a cat make is rattling.
Bang on the cat and see if it rattles, if not it's probably ok. The next step to verify would be to remove it and see if it's broken. The only sound I've heard a cat make is rattling.
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Agree on the head gasket leak. They don't typically make a sound unless it is an air-cooled engine. Then they make a sound like a leaking or cracked exhaust manifold.
Magnaflow and Walker are both good aftermarket replacements that I've used. Depending on what state you live in, be sure to get a CA emissions or Federal emissions replacement. (I think I'd be fair in saying that most folks get Federal emissions units regardless)
Regarding longevity, if it's previous live(s) were spent doing a lot of cold starts and slow driving, 70,000 miles of that could add up and make a cat go bad. 70,000 miles in 15 years is only ~4,600 miles per year.
Magnaflow and Walker are both good aftermarket replacements that I've used. Depending on what state you live in, be sure to get a CA emissions or Federal emissions replacement. (I think I'd be fair in saying that most folks get Federal emissions units regardless)
Regarding longevity, if it's previous live(s) were spent doing a lot of cold starts and slow driving, 70,000 miles of that could add up and make a cat go bad. 70,000 miles in 15 years is only ~4,600 miles per year.
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Update
Thanks for the comments everyone. I had the headers milled and all bolts replaced with new gaskets, along with a new California emissions CAT, and new muffler. It's no longer sluggish however I'm still getting the same noise at 1800 rpm. It looks like where the Y pipe connects to the headers someone put that orange gasket maker stuff, I'm wondering if the leak is coming from there. If I can try and explain the sound, it only happens when the engine heats up, only when under load, and it sounds like a mixture of an air leak with a tin metal flapping noise lol. At this point I'm going to redo the y pipe, so there is a new connection there, if that doesn't fix it my only guess is there is still an issue at the headers.
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From: Media PA
Thanks for the comments everyone. I had the headers milled and all bolts replaced with new gaskets, along with a new California emissions CAT, and new muffler. It's no longer sluggish however I'm still getting the same noise at 1800 rpm. It looks like where the Y pipe connects to the headers someone put that orange gasket maker stuff, I'm wondering if the leak is coming from there. If I can try and explain the sound, it only happens when the engine heats up, only when under load, and it sounds like a mixture of an air leak with a tin metal flapping noise lol. At this point I'm going to redo the y pipe, so there is a new connection there, if that doesn't fix it my only guess is there is still an issue at the headers.
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