2013 x3 f25 28i rattling noise

frogman27 · 10-04-2019, 05:50 AM

2013 x3 28i...
This is video of my car when I start engine.
What is wrong with my car?
Should I put some WD into exhaust pipe?
Or valve cleaner and Injection cleaner will help this?
Or should I change exhaust muffler?
Please help me.

TheCoolX3 · 10-04-2019, 08:22 AM

WD-40 in the exhaust pipe likely will not help this issue. I suspect that is the turbo waste gate rattling or the butterfly valve in the muffler.

Look under the car above the pipes leading out of the muffler, you should see the butterfly valve. Repeat the conditions that cause the sound and watch the butterfly valve at the same time. If you see it freaking out, we can go further from there. If its operating normally I would say you may need to replace the turbocharger.

Opie55 · 10-04-2019, 08:50 AM

That sounds like it is coming from the rear. Your turbo wastegate is way up front so that would not be my first suspicion. As Cool said, the first thing to check is the butterfly valve. The valve itself is inside the exhaust, but the thing that opens and closes it is on top near the back shortly before the tailpipe tips. It's a cylinder the size of a large plum with a line running to it. See if the arm coming out that operates the valve feels loose. Or hold it while recreating that condition. Or I think you can see the valve itself inside the inboard tailpipe. Stick something in there to jam it tight like a piece of rag and see if the vibration stops.

10-04-2019, 05:50 AM	#1
frogman27 New Member 0 Rep 19 Posts Drives: Bmw x3 Join Date: Aug 2019 Location: Destin iTrader: (0)	2013 x3 f25 28i rattling noise 2013 x3 28i... This is video of my car when I start engine. What is wrong with my car? Should I put some WD into exhaust pipe? Or valve cleaner and Injection cleaner will help this? Or should I change exhaust muffler? Please help me.
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10-04-2019, 08:22 AM	#2
TheCoolX3 Lieutenant 174 Rep 540 Posts Drives: 2016 BMW X3 35i M-Sport Join Date: Feb 2018 Location: FL iTrader: (0) Garage List 2014 Porsche Cayenn ... [0.00] 2019 Tesla Model X [0.00] 2016 BMW X3 [0.00]	WD-40 in the exhaust pipe likely will not help this issue. I suspect that is the turbo waste gate rattling or the butterfly valve in the muffler. Look under the car above the pipes leading out of the muffler, you should see the butterfly valve. Repeat the conditions that cause the sound and watch the butterfly valve at the same time. If you see it freaking out, we can go further from there. If its operating normally I would say you may need to replace the turbocharger. __________________ 2016 X3 35i \|M-Sport\|Megan Racing Coilovers\|FBO+\|BM3\|Jordan Tuned\|Valvetronic Designs\| 1998 750iL V12\|2017 440i\|2019 991.2 GT3RS Weissach\|2019 Model X\|...and some others Instagram @TheCoolX3
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10-04-2019, 08:50 AM	#3
Opie55 Colonel 1195 Rep 2,907 Posts Drives: '15 650i Convertible Join Date: Apr 2018 Location: US iTrader: (0)	That sounds like it is coming from the rear. Your turbo wastegate is way up front so that would not be my first suspicion. As Cool said, the first thing to check is the butterfly valve. The valve itself is inside the exhaust, but the thing that opens and closes it is on top near the back shortly before the tailpipe tips. It's a cylinder the size of a large plum with a line running to it. See if the arm coming out that operates the valve feels loose. Or hold it while recreating that condition. Or I think you can see the valve itself inside the inboard tailpipe. Stick something in there to jam it tight like a piece of rag and see if the vibration stops.
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