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Strange irregular sound from engine

E-Class (W211) 2003-2009

Strange irregular sound from engine

Old 05-16-2019, 03:51 AM
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W211 E550 LPG
Strange irregular sound from engine

I hear strange knocking sound from engine bay on my W211 E550 facelift (OM273). Apart from that, engine has full power, no hesitation to accelerate. I am not sure where it is coming from. What could it be
here is video:
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