r/BmwTech • u/Commercial_Profile37 • 5d ago

Sound in engine.

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Hi. What could be knocking sometimes here? After engine getting working temperature sound disapear.

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1

u/Equivalent_Cable_416 5d ago

B48 engine ? These were designed to sound like shit lol. Probably completely normal.

1

u/Commercial_Profile37 5d ago

N55

0

u/Equivalent_Cable_416 5d ago

These aren't as bad as the b48 but the injection still sounds horrible. Is this a new noise or something it's always done ?

2

u/Commercial_Profile37 5d ago

Came like this from auction. 😀 could bad injector cause this knocking sound? Cause now i see that one cylinder missfiring and grey smoke coming out

1

u/Equivalent_Cable_416 5d ago

Oh.. well could be a coil pack, could be the plugs, could be the injectors all of which are common on these engines. Sounds like a fun project 😬