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-   -   Very light knocking sound coming from the Engine (http://forum.e46fanatics.com/showthread.php?t=956186)

RedDevilAngelEyes 11-15-2012 05:59 PM

Very light knocking sound coming from the Engine
Hello everybody. I recently started to notice a very light knocking sound coming from the engine. You can only hear it when you stand behind the doors, but when you stand in front of the car, nothing. Also i have to top off my oil like every 2-3 weeks. Im running on castrol full synthetic 5w-30

Sweetness 11-15-2012 11:55 PM

This could be a crack on the exhaust pipes that is causing this resonating sound. All BMW's (e46's at least) have this sound, very lightly, like a thumping, and is normal. Actual knocking, as in hoarse metallic sounds is probably the lifters in the engine.

Nerdy46 11-16-2012 12:00 AM

How much oil are you putting in? Sounds like an exhaust issue, but id want to hear it from down below to make sure its not a bearing starting to go south.

RedDevilAngelEyes 11-16-2012 03:15 PM

I have to add a quarter because the sensor turns on. I heard it might be that the piston rings are worn out, could that be a possibility?

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