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Discussion Starter #1
Good afternoon,

New issue for the Silver Bullet, about half the time when I start the car, a low rumbling noise can be heard. I couldn't identify the issue, so I brought it in to mg local Mercedes dealership, and they said they have no idea. (Said it was the ABC pump, replaced it, charged 1.5k, problem persists, try again, charge another 1.5k, no results.) I can feel it in the brake pedal as well, and sounds almost like ABS is engaging. Any and all help is appreciated!

-Wayne
 

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Discussion Starter #3
Is it possibly a catalytic converter failing?
Possibly, but it only occasionally rumbles, and never when operating. Additionally, everything still performs like new, so if a cat was breaking down, I think it would either cut off some exhaust flow, or would spit a code for catalytic efficiency. I will definitely look into that though, as it is the best lead I have at this time.

Thanks!
 
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