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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Oil filler cap removed... knocking noise??



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      10-11-2015, 05:01 AM   #1
The Londoner
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Oil filler cap removed... knocking noise??

I've got an 330i (N53) and I've been doing a bit of DIY diagnosis on some possible issues I may have and one of them involved removing the oil filler cap while the car is idling. As soon as I removed the cap I could hear a knocking sound coming from the hole. Replacing the oil cap stops the knocking noise, or at least blocks the sound so I can't hear it.

Is this normal?? Anyone fancy trying it with their car to see if they get the same knocking noise??
Until now I can't say I've ever removed an oil cap while the engine is running so I'm not sure what I should be hearing.
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      10-11-2015, 06:41 AM   #2
Efthreeoh
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It's normal. The valvetrain of an internal combustion engine is a noisy place.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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      10-11-2015, 06:55 AM   #3
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Quote:
Originally Posted by Efthreeoh
It's normal. The valvetrain of an internal combustion engine is a noisy place.
Ok I'll relax a bit now. Thanks
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