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A knocking sound from a bad catalytic converter often resembles a rattling or metallic clanging noise, especially when accelerating or idling. This sound can occur due to internal components, such as the catalyst substrate, breaking loose or becoming damaged. Additionally, if the converter is clogged, it may produce a more pronounced thumping sound as exhaust gases struggle to pass through. Overall, any unusual noise from the catalytic converter warrants immediate inspection to avoid further engine damage.
What else can I help you with?
Would a loose torque converter make a knocking sound?
Yes, loose converter bolts sound a lot like a failed rod bearing.
What causes a knocking sound but doesn't reduce power?
Sounds like a piston hitting the cylinder head. A lifter will usually tick, but a piston will sound more like this knocking noise.
Why does the rear end of your 1999 Subaru Outback Legacy sound like its knocking?
i don't know if it helps, but my '99 legacy outback was making a knocking sound. turned out that the oring on the brake caliper pin had worn out, and the pin was kind of knocking around.
A 2000 geo metro is making a knocking sound in motor like a rod but it is't?
Valve train
What is the knocking sound on a 350 Chevy it sounds like a rod but then it stops rods don't just stop knocking do they?
Sounds like your lifters are bad and might need ajusted or changed, it could be your cam not looping.
1993 Dakota v8 acts like is running out of gas loud pinging have use octane boost but still the same?
does it sound more like a knocking sound from the engine at idle?
Why does a Rattling sound can be heard inside my catalytic converter?
bits of the catacomb that makes up your coverter have fallin losse. if it sound like there is dirt in it that that's the case. The catalytic converter needs replaced.
What causes a 94 Ranger to start knocking like a jackhammer consistently increasing and decreasing with accelerator usage and then completely kills the engine?
it is the catalyic converter. That is what happened to mine
Why does your engine make a knocking sound when you accelerate?
When you accelerate. you are putting presure on the main engine barrens. if they are going bad. You will hear this knocking sound. I don't know how many miles you have on this engine. But that's what it sounds like. But that's not all that can make this sound. You will have to tell more about it and when it started. Did it just start all at once? or did it start and then get louder?
What would cause a knocking sound under the hood only when the air conditioner is running?
sounds like you ac compressor is about to crap out.
What does water hammer sound like when it occurs in a plumbing system?
When water hammer occurs in a plumbing system, it sounds like a loud banging or knocking noise.
Why 5 speed manual transmission has knocking sound when gear engaged Knocking accelerates with vehicle When you rev the engine while clutched no sound When you clutch and coast no sound?
it sounds like a bad throw out bearing or clutch plate. not a major deal it just starts to get louder but eventually you going to have to replace it when you do your next clutch job. chris
