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Discussion summary
YOUR RESEARCHPSA : Don't jump the gun .....Test
Leading reported evidence
Replace cat)
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Suggestion · Original poster
There has been many engines Rebuilt due to this noise that the noise was still there after the Rebuild ( and had to replace the Cat)..
Leading evidence: 'Replace cat)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace cat)' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
anybody out there with a cat that's been sitting on a shelf and you want to get rid of, please PM me, I hate to throw big money at it on a maybe, I have Fisters muffler set-up now, so not looking to change the whole exhaust
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Suggestion · Original poster
Moral of the story , Don't assume .....TEST ...it could save you $20K...
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Suggestion
I have no codes and just passed the California smog test earlier this week and running fine, just have that frigging noise at Idle to contend with.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
anybody out there with a cat that's been sitting on a shelf and you want to get rid of, please PM me, I hate to throw big money at it on a maybe, I have Fisters muffler set-up now, so not looking to change the whole exhaust
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7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Generation: 20261027T042512Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
A couple of weeks ago a guy on a Facebook page shows a video of a 2000 Carrera with a loud ticking/knocking sound at idle on bank 2..
Of course everyone jumps the gun with about a 100 "Guru's " saying borescoring and another 10% saying lifters....
I told the OP to get a Mechanics Stethoscope ($20) and to listen to the Catalytic Converters , he came back to me and told me found the Core of the Catalytic Converter was loose and falling apart and gave me a picture of a piece of the Converter ...( Below)
I have seen this before especially on the "early 3.4's " with the IRon Ferrostan Piston plating just hardly ever scores.....
There has been many engines Rebuilt due to this noise that the noise was still there after the Rebuild ( and had to replace the Cat)..
Moral of the story , Don't assume .....TEST ...it could save you $20K...
A piece of Catalytic Converter
You had told me to look/listen there many years ago, even bought a mechanics stethoscope, but failed to get the results I was looking for. I have 1/98 C2 with 60K. Today was the day to give it the old (second) college try. After a forty minute ride, I came back and gave it a go, sure enough, bank 2, passenger side cat sounded like marbles, bank 1, nothing. Removed it today, hoping for a eureka moment and see a similar chunk fall out like the one pictured, but I got nothing! Shaking it was whispered quite as well. Could it still be failed, I did not remove the O2 sensor yet, thought I'd pause and do a little forum scouring, before anymore removal. I have no codes and just passed the California smog test earlier this week and running fine, just have that frigging noise at Idle to contend with.
I suppose you are talking about this Thread/Video...
Yes it can still be the CAT ...when they cool off the shell can squeeze down tight on the CAT and stop the noise....When hot the shell will grow and get loose and make the tapping noise...
https://rennlist.com/forums/996-foru...with-revs.html
I'll take plausible, so the next move would be to find a salvaged bank 2 cat? or is there another way of testing,.... anybody out there with a cat that's been sitting on a shelf and you want to get rid of, please PM me, I hate to throw big money at it on a maybe, I have Fisters muffler set-up now, so not looking to change the whole exhaust
If you have a distinct difference in Noise from one Cat to the other. then it is not a "maybe".....
If you are unsure then take to a PRO to have a listen...slinging a few $$ to a Pro will cost less than buying unneeded parts...
Much appreciate your help Skip. Its a no doubter, no noise on bank 1 at all, followed both pipes before and after cat, noise only followed bank 2, I already have it removed, so if I can source a replacement for that side, I think that is the best path forward, mix-matching with an aftermarket cat for one side, like magna-flow cut and weld in, if that's even possible, seems like a recipe for disaster.
