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Time to upgrade the turbos, just in case, need to make sure it isn’t turbo failure, so the only thing that makes sense are a set of M800’s to diagnose the problem …
So hard to diagnose from sound clips over the internet but here are my guesses...
First thought as above is a loose fastener or screw somewhere on the exhaust. Could be from somewhere else too.
But it also almost sounds like an air leak I would think as well coming from exhaust. Almost like a bad seal or gasket or something. Is there any way to get your hand up in there without getting burned to see if you can feel some pulsating air?
While @MingusDew was joking I think, he might not be far off. It could be the wastegate flapper valve is loose from the arm at which point you would need a new turbo. Or maybe the wastegate actuator arm lost it's retaining clip and is loose. I'm kinda leaning towards loose flapper valve though which will require taking the sport cat off to check. Though seems it's early life failure which could potentially be covered by warranty.
This is the valve for reference. It's has to tabs to prevent rotation which keeps the valve from machining itself off from spinning too much. But what could have happened is the stem that goes thru the small washer and gets mushroomed riveted for retention, that stem may have stretched and now the valve is a bit loose. Eventually, it'll fail and end up in the cat.
One last thing to check is that the vacuum line to the wastegate actuator isn't loose. Hmm. Does the noise go away if in sport mode? Sport mode should hold the valve shut which would prevent the rattling noise. Vacuum is required to hold the actuator shut, so if no vacuum, the valve will be open and potentially rattle.
Last edited by spdracerut; 11-06-2023 at 04:08 AM.
While @MingusDew was joking I think, he might not be far off. It could be the wastegate flapper valve is loose from the arm at which point you would need a new turbo. Or maybe the wastegate actuator arm lost it's retaining clip and is loose. I'm kinda leaning towards loose flapper valve though which will require taking the sport cat off to check. Though seems it's early life failure which could potentially be covered by warranty.
This is the valve for reference. It's has to tabs to prevent rotation which keeps the valve from machining itself off from spinning too much. But what could have happened is the stem that goes thru the small washer and gets mushroomed riveted for retention, that stem may have stretched and now the valve is a bit loose. Eventually, it'll fail and end up in the cat.
One last thing to check is that the vacuum line to the wastegate actuator isn't loose. Hmm. Does the noise go away if in sport mode? Sport mode should hold the valve shut which would prevent the rattling noise. Vacuum is required to hold the actuator shut, so if no vacuum, the valve will be open and potentially rattle.
this is exactly it. Turbo needs to be replaced.
Thanks for the input!
11-05-2023, 01:28 PM
991.2 ticking?
