BeardedGrayRhino Posted September 28, 2019 Share Posted September 28, 2019 I've got the exact same issue and is only been happening the last few months on my 2016 2.5. I took it to muffer shop who said it was damage to the catalytic converter and needed a new one for $800. I thought that was b******* and walked out. Anyone try replacing the flex hose see any difference afterwards? Sent from my SM-G975U using Tapatalk Link to comment Share on other sites More sharing options...
Kario Posted September 30, 2019 Author Share Posted September 30, 2019 (edited) I've got the exact same issue and is only been happening the last few months on my 2016 2.5. I took it to muffer shop who said it was damage to the catalytic converter and needed a new one for $800. I thought that was b******* and walked out. Anyone try replacing the flex hose see any difference afterwards? Sent from my SM-G975U using Tapatalk What mileage does your car have? I've noticed this when air temperature in the mornings got colder. I think it was about 3k miles on the odometer. With this little mileage I think the catalytic converter or the hose can be ruled out... Edited September 30, 2019 by Kario Link to comment Share on other sites More sharing options...
BeardedGrayRhino Posted September 30, 2019 Share Posted September 30, 2019 I've got 109k on my 2016. I would expect worn parts but not getting any type of lights on the dash indicating there's a problem. Sent from my SM-G975U using Tapatalk Link to comment Share on other sites More sharing options...
Kario Posted October 7, 2019 Author Share Posted October 7, 2019 I've got 109k on my 2016. I would expect worn parts but not getting any type of lights on the dash indicating there's a problem. Sent from my SM-G975U using Tapatalk Have you managed to diagnose the issue? I'm not convinced that this is caused by high pressure gas burst. If it was than I expect that this would be common to all gasoline engines. Link to comment Share on other sites More sharing options...
BeardedGrayRhino Posted October 7, 2019 Share Posted October 7, 2019 I have not. I think there's merit to high pressure gas burst. After 2-3 minutes of warning up, the sound dissipates. If I step on the accelerate hard while driving, I'll hear a growl. I'm going to remove heat shields and see if there's damage. I'll support once done. Sent from my SM-G975U using Tapatalk Link to comment Share on other sites More sharing options...
ammcinnis Posted October 7, 2019 Share Posted October 7, 2019 I'm not convinced that this is caused by high pressure gas burst. If it was than I expect that this would be common to all gasoline engines. You may be right. But consider that not all gasoline engines vary camshaft/valve timing and ignition timing based on temperature, either. "If you don't know where you're going, any road will take you there." ~ The Cheshire Cat (Alice in Wonderland) Link to comment Share on other sites More sharing options...
BeardedGrayRhino Posted August 26, 2020 Share Posted August 26, 2020 Unfortunately I had the exact issue. My car sounded like a nascar when starting cold. After a few minutes, the sound would go away. It could be heard while accelerating after cold start or if accelerating heavily. I removed the plastic skid plate and didn’t find any visible issues with the exhaust. I had it looked at by two muffler shops and both had same diagnosis; catalytic converter. It wasn’t visibly from the bottom. The repair cost me $800 for the new cat and $200 for labor. Four hours later, the car sounded like new. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
apexi Posted August 26, 2020 Share Posted August 26, 2020 I wonder if the bellows were cracked and maybe it was just hard to see.. https://legacygt.com/forums/showthread.php/exhaust-smell-recall-wuj-95-281725.html?t=281725 Link to comment Share on other sites More sharing options...
Kario Posted April 28, 2021 Author Share Posted April 28, 2021 Thought I bring this up again as this still does not have a definite answer. I've never been able to diagnose the issue. Each time I tried to reproduce this at dealer the car were somewhat warmed and they never heard it - I don't blame them become if the cars is not just started after seating for a whole day than you really need to know what you are looking for. Than the pandemic hit and I had other more important things to take care of but yesterday I was helping to start a car using cables and I was revving my car engine with and opened hood and there it was with a warmed engine and in neutral the knock was audible at around 2000+ rpm. Here it is: https://photos.app.goo.gl/yJy1oerhmiPjk7Bx8 Much more audible in real life then on recoding but its there if you use the right sound output. Link to comment Share on other sites More sharing options...
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