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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-30-2014, 08:04 AM   #1
EZ-does-it
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Join Date: Jul 2014
Location: Coventry
Posts: 3
My Ride: 325 Touring
Engine Knock on 325 (with video)

Hi everyone!

I've just picked up a 325 touring, it was a good price but needs some work, I'm doing all the brakes, worn bushes etc but there is one problem that has me stumped:

The engine knocks at idle, it's not very loud and hasn't got noticeably worse in 700 miles but I'd like to diagnose it anyway. The engine is silky smooth and doesn't knock once it's above 1100rpm. The oil light is not on, I have replaced the dirty oil with 5w30 which made the sound a little quieter (but not much).

Here's the video:


I've read through a bunch of old posts here and on other forums but not found any definitive answers, if anyone can help diagnose it I'd be very grateful _a_
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Old 08-01-2014, 04:48 AM   #2
EZ-does-it
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Join Date: Jul 2014
Location: Coventry
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My Ride: 325 Touring
Have I posted in the right area?
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Old 08-01-2014, 06:24 AM   #3
ReIntegration
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Join Date: Feb 2014
Location: Long Island, NY
Posts: 306
My Ride: 2003 BMW 330Ci
Sort of sounds like the oil pump could be going out. The oil pump sends a small amount of oil though the motor at a idle, but when you bring the RPM higher the oil pump will pump more, therefore the engine is getting the proper amount of lubrication it needs. From what I've learned over the years a lack of oil will make the rods knock a bit. Also a loose or shot flywheel bolts can sound like a knock too. These are just speculations I'm not 100% sure though.
Good luck.
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Wernher Von Braun
2001 330Ci (My uncle was the original owner then given to me as a secondary to my 03)(Sold)(Kept younger brother)
2003 330Ci (Current - Born on 1.10.03)(Had it since new born. Delivered from Regensburg on 2.24.03)

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